Turner-Fairbank Highway Research Center

 
 
 

Highway Safety Information System Guidebook for the North Carolina State Data Files

Prepared by

Forrest M. Council
University of North Carolina
Highway Safety Research Center
730 Martin Luther King Jr Blvd, Suite 300, CB #3430
NC 27599-3430

and

Anusha patel Nujjetty
Yusuf M. Mohamedshah
LENDIS Corporation
Turner-Fairbank Highway Research Center
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101

Prepared for

Federal Highway Administration
Office of Safety and Traffic Operations Research & Development
U.S. Department of Transportation
Washington, DC 20590

Revised, February 2014

Table of Contents

Introduction

The North Carolina database incorporated into HSIS contains four different files --accident characteristics, vehicles in the accidents, occupants in the vehicles, and roadway inventory (which includes AADT data). Before 2000, the data was derived from the “MERGE” system, a mainframe database maintained by the NCDOT.  Since 2000, the three crash subfiles have been derived from the “NCDMV” system maintained by the NC Department of Motor Vehicles (DMV) while the roadway inventory file has been provided by the NCDOT GIS section. 

For ease of use, the three accident subfiles and the Roadlog File have been converted to SAS files in HSIS. Raw file data provided to the Highway Safety Research Center (HSRC) are retained as backup information.  The documentation (variable listings, definitions, etc.) for these raw files and for the SAS files that are developed from them are available at Federal Highway Administration (FHWA) offices.

Beginning in 2004, the HSIS system was converted from a SYBASE relational database to an ORACLE relational database for internal use. Data files for a given State are linked and manipulated by HSIS staff using SAS code and, as in the past, we have continued to produce SAS format libraries for each of the variables in each of the files. This Guidebook will concern these SAS files - their formats, completeness, and quality. However, researchers requesting data from HSIS can request the output in various formats such as SAS, Microsoft Excel® and Access®, dBase, ASCII, etc.

As noted above, the accident data are divided into three separate subfiles. The first containing the basic accident information on a case by case basis, the second containing information up to 15 vehicles in each accident, and a third containing all occupants in each of the 15 possible vehicles. The vehicle and occupant data can be linked to the basic accident file for a specific case using the accident report number. The accident subfile can be linked to the Roadway Inventory File using a county/route/milepost variable.

Unlike the accident file, which is referenced to a point on the roadway, each record in the Roadway Inventory File contains information on a homogeneous section of roadway (i.e., a stretch of road which is consistent in terms of certain characteristics, with a new section being defined each time any of the characteristics changes). Each record on the basic inventory file contains current characteristics of the roadway system, and includes such variables as surface width, lane width and type, shoulder width and type, median information and other variables. This file also contains information on traffic volumes -- AADT and some data on total percent trucks and truck percent during peak time periods.

Details of the files noted above are included in the following sections.

Details of Major Files

The Accident Files

Accident data are collected statewide by all police departments in North Carolina on a standard form as prescribed by state law. The prescribed accident-reporting threshold is currently personal injury or $1,000 property damage. Prior to 1996, the crash-reporting threshold was $500. It is felt that this threshold is generally used for all accidents occurring on the entire North Carolina roadway system, both in rural and urban areas. It is probably more consistently followed in the rural areas where the State Highway Patrol does most of the reporting. However, it is a feeling of North Carolina data users that the overwhelming majority of municipal police agencies also follow the same reporting threshold.

There are currently approximately 280,000 accidents in the entire state each year. For each crash that is investigated, an accident report form is sent to the North Carolina Department of Motor Vehicles (DMV) Accident Reports Division, the central repository of the accident data. The DMV is responsible for coding and keypunching all of the information on the form, including the data used in locating the accident to the roadway system. Of the 230,000 accidents that are keypunched each year, approximately 70% of these are linkable with the Roadway Inventory File. Note that the non-linkable accidents are primarily those occurring on city streets that are not part of the “state system”. The number of linkable accidents has increased considerably from 2003 onwards. This is because the number of inventoried miles to which crashes can be mileposted has increased. Hence, for 2012, HSIS has about 144,000 crashes that are linkable to the roadway inventory. Before 2003, the number of linkable crashes was significantly lower (about 100,000 in 2000 and about 95,000 in 1997). The HSIS currently includes data from 1990 through 2012.

In terms of coding accident location, the North Carolina system is different than many of the other state systems. The crash location system is a county/route/milepost system, which is based on a computerized (non-physically mileposted) “paper” reference system. The Department of Motor Vehicles types the basic location information provided by the investigating officer. This includes the route, on which the accident occurred, and a distance and a direction to a reference point such as an intersecting roadway, a bridge, or a city boundary. The computer then assigns a milepost based on these data. In providing their location information, police officers are asked to report distance to the nearest one- tenth of a mile in rural areas when the crash is not at or near an intersection. If an accident occurs within 500 feet of an intersection, the distance is to be reported in feet. In urban areas, locations are generally provided in feet from a nearby intersection. There is some indication that the “less than 500 feet” criterion is not always followed for rural intersections. It is felt by NC DOT and other users that approximately 80 to 90 percent of the mileposted accidents on state-system roads in urban areas are correctly mileposted within 100 feet of their true location. Similarly, it is felt that approximately 80% of those in rural areas are mileposted within a tenth of a mile of their true location.

Of the 79,000 miles of roadway on the North Carolina state system, approximately 39,000 miles are included in this computerized reference system until 2001. Accidents could only be located to these 39,000 miles of roadway. For 2002 – 2008, between 60,000 and 70,000 miles are included, resulting in a significant increase in linkable accidents (i.e., approximately 140,000 annually). For 2009 and later, the number of total linkable miles increased to approximately 78,000.  However, due to changes in the AADT assignment procedures, the number of linkable miles with AADT decreased to 27,000 in 2009 and 2010 and 43,000 in 2011 and later. The numbers of linkable crashes decreased to 132,000 in 2009-10 and 144,000 in 2011 and later.  (It is noted that the 27,000 miles in 2009 and 2010 is still larger than the inventoried and mileposted systems in most states within HSIS). The linkable routes include all Interstate, U.S., and N.C. routes, and major secondary routes (down through collectors) in both rural and urban areas. While AADTs were estimated for a large number of urban and rural roads classified as “local” prior to 2009, they were only estimated for a limited sample of these local roads in 2009 and later. Thus, the un-linkable miles are predominantly secondary roads in rural areas and city streets in urban areas. (Note that there are no "county roads" in North Carolina since all except for non-system city streets are under State control.) Some accidents on primary routes in urban areas cannot be mileposted due to changes in street names, which have not been updated in the computerized mileposting program.

As indicated above, North Carolina is in the process of updating its accident record system by converting to a relational database. An important component of this modified system will be the ability for users of the data (e.g., Traffic Safety Systems Section staff) to make online corrections to accident locations in their use of hard copies.

The North Carolina accident file contains the basic variables found on most state accident files, with some important additions. There is both a first harmful event and a most harmful event variable, allowing one to better correlate injury to specific type of impact. Unlike other HSIS states, North Carolina accident files from 2000 onwards have some work zone related variables which allows one to locate a crash in relation to the location in the work zone and whether the work zone was marked or not.

The Vehicle file contains approximately 250,000 vehicles each year. As in accident file, the number of vehicles for 2002 – 2008 reflects the higher number of crashes that are present for these years because of a higher number of linkable roads. Unlike any other HSIS state, information on truck trailer width and length and total truck length is captured from the accident report form. This allows for categorizations of truck data not usually possible in most state truck files. There is a rollover variable that is separate from all other variables and specific to each vehicle, allowing one to separate rollover from both the type of accident and from impact with fixed objects. This allows the study of rollover as a result of other impacts, such as impacts with fixed objects. There is an officer judgment related to “drivability” of the vehicle, which can be used as a towaway threshold in certain analyses. From 2000 onwards, there are event variables in the vehicle file, which allows one to examine the sequence of events of an accident. Finally, there is also an indicator of airbag deployment. Note that due to change in reporting practices from 2000 onwards some variables were dropped and some new variables were added. A NOTE is added under such variables in the format section of the guidebook.

It should also be noted that the North Carolina Vehicle subfile did not contain detailed elements on large truck crashes proposed by the National Governor's Association (NGA) until 2000. In 1999 and earlier, supplemental NGA data were collected by some officers (primarily State Highway Patrol officers) on truck crashes on a supplemental report form. These data are submitted to the Truck Enforcement Unit at the Division of Motor Vehicles for computerization.   Unfortunately, no standard accident number is available to link these data with the standard Accident File. However, in 2000, the accident report form was modified to include virtually all of the NGA-specified variables. Thus, these truck-related data are in the 2000 and later accident files.

The Occupant subfile includes information on all occupants in a vehicle, whether injured or not. This file contains approximately 350,000 occupants each year after 2002, and includes standard variables related to seating positions, sex, race, and injury. As with most other states, the injury variable in North Carolina is the KABCO system, which provides police estimates of injury level.

In general, the severity of crashes in North Carolina is somewhat more severe than in the other HSIS states, with more injury crashes and a lower percentage of PDOs. This probably stems from the fact that North Carolina is somewhat rural, as reflected by the slightly higher proportion of crashes in rural areas.

Tabulations were run to examine the question of reporting completeness and data quality for accident, vehicle, and occupant variables. Here, study of percent of “unknown,” “not applicable,” and “not stated” values for all key variables found in these files indicates that, in general, the data are quite complete. In most cases, non-coding occurs in less than one percent of the cases. For variables in which the percentage of non-coding is somewhat higher, a "NOTE" has been included under that variable listing in the later format sections of this Guidebook.

To assess the accuracy of the accident variables (and the variables in the other files), we questioned users of the data and examined and compared certain single variable tables.  In North Carolina, we questioned staffs in the Management Information Systems office who maintain the computerized files, the Traffic Safety Systems Section who use the data in various hazardous location analyses and other evaluations, and the Highway Safety Research Center staff who have used the data for more than thirty years in a variety of analysis efforts. The staff were interviewed concerning variables they feel are incompletely coded or that might be inaccurate. In general, most indicated that they felt that almost all the variables on the file were accurately coded. It is obvious that the “occupant restraint use” variable on the file is inaccurate, in that regularly conducted field observations of use indicate figures which are at least 10 to 15 percent lower than the values found in the accident file. (This is felt to be the case in accident-based measures of occupant restraint use in all states systems, particularly in states with a strong belt-use law which will cause drivers to report to the investigating officer that they have used the belt whether they have or not).

The Roadway Inventory File

Prior to 2010, the roadway inventory information was the responsibility of the Roadway Inventory Section, GIS Branch, of the NC Division of Highways. In 2010, the inventory information became the responsibility of the Inventory and Assessments unit within the Division of Highways. The traffic volume data is the responsibility of the Traffic Survey Group. Both units provide their data to the GIS Unit, who compiles and distributes the combined inventory and AADT data in quarterly releases. HSIS staff downloads the first-quarter release each year and uses the inventory data as the end-of-year file for the previous year (e.g., the first-quarter 2013 data are used as the 2012 HSIS file.) The AADT for the previous year are usually not released until the third quarter. HSIS staff downloads these data and merges them into the prior-year file. This means that unlike 2001 and earlier HSIS files, the 2002 and later files contain AADT data for that year (e.g., all AADT data in the 2012 file have an AADT Year of 2012).

The original roadway inventory file was based on field inventory and constructions plans and was developed a number of years ago. Since that time, copies of all construction, resurfacing, or major widening plans are sent to the Inventory and Assessments unit who input data from the plans. Thus, the updating is done on an ongoing basis.  

As noted above, the basic inventory file contains current characteristics of the state road system. It is estimated that there is approximately 92,000 miles of total roadway mileage in the state. There is 79,000 miles of roadway in the NC DOT roadway inventory system, approximately 14,000 of which are primary roadways. The 79,000 miles represents a very high proportion of total existing mileage in the state, much higher than is what is found in almost all of the states in the nation, since there are no “county roads” in North Carolina -- all such roads are controlled by the NC DOT. The remaining 15,000 miles of total state mileage are city streets.

As indicated above in the linkable-accidents discussion, the 2010 change in ownership of the NCDOT inventory and traffic volume files has resulted in new procedures for assigning AADT to roadway segments. This has resulted in changes to both (1) the amount of state-system mileage for which AADT estimates are made, and (2) inconsistencies between older and newer AADTs for some number of segments.

With respect to the first issue, prior to 2002, the HSIS system contains approximately 39,000 miles of crash-linkable roadway. Because of a sustained NCDOT effort to increase the number of miles to which crashes could be linked, the number of miles in the HSIS system increased to between 60,000 and 70,000 for 2002 – 2008. For 2009 and later, the number of total crash-linkable miles increased to approximately 78,000. All these miles are in the HSIS system. However, due to changes in the AADT assignment procedures beginning with the 2009 file, the number of linkable miles with AADT decreased to 27,000 in 2009 and 2010 and 43,000 in 2011 and later. This decrease results from the fact that very few AADT estimates are included for approximately 36,000 miles of rural and urban state-system roads classified as “local” in these 2009 and later files. NCDOT feels that many of the base counts for these local roads are so old that they are no longer usable in estimating AADTs.  (Note that the NC roadway inventory file contains an “AADT Year” variable that can be examined by the user to determine when a segment-AADT was estimated.) Even though AADT is perhaps the most important variable in the HSIS inventory file, a decision was made to retain these older local-road AADTs in the pre-2009 HSIS files. However, the user must be aware that they are often based on (very) old raw count data. A decision was also made to retain the 2009 and later road segments without AADT for use by users who either do not need AADT or who wish to develop their own AADT estimates for the segments with missing AADT.

With respect to the consistency across time issue, the new procedures are considered to be much more accurate than past procedures for some unknown number of highway segments.  Indeed, example manual comparisons of count station AADTs to AADTs assigned to nearby segments conducted by NCDOT and HSIS staffs show this to be the case. Unfortunately, there is no systematic way of determining which segments have consistent data across the pre- and post-2009 period. After discussions with NCDOT staff, it was decided that the original AADT values for all road segments classified above “local” in the 2002 – 2009 HSIS roadlog files would be replaced with revised values based on the updated procedures to the extent possible. (The 2002 file was the earliest that NCDOT traffic staff had updated data for.) This revision required that 2010 “AADT segment” addresses (i.e., county/route/mileposts for the begin and end of each AADT segment) be extrapolated back to the 2002 – 2009 HSIS inventory file segments. This is likely to have introduced some error in the estimates on routes where the “address” of a given segment has changed over time due to major reconstruction efforts (e.g., lengthening an upstream curve). However, both NCDOT and HSIS staff feels that any error introduced is likely much smaller than errors that would have been introduced by not revising the 2002-2008 AADTs. Note that neither the AADT values for road segments classified as “local” for 2002-2008 nor the 2001 and earlier AADT estimates for all road segments have not been revised and are not likely to be revised in the future. 

The average homogeneous section length in the NC (and HSIS) roadway inventory file is approximately 0.7 miles. Table 1 presents mileage breakdowns for all paved two-way roadways (i.e., omitting all unpaved and one-way roadways) for the latest available year, 2012. Note that the rows for individual roadway categories show mileage with AADT estimates present. As expected since it is a state-controlled system, the file is predominately rural in nature, with close to 78% of the roadways with AADT estimates being in rural or near-rural areas. (NOTE: Of the total amount of mileposted mileage available for inclusion in the basic Inventory File, approximately 750 miles of roadway were omitted. These roadways are either characterized as couplets (i.e., usually urban roadways with the same route number in which the two directions of travel are separated by one or more city blocks) or as other divided roadway with "unbalanced" geometrics (i.e., roadway segments in which the geometrics, such as shoulder width or type, are not the same in both directions of travel). This relative small amount of mileage is difficult to work with both in terms of characterization of a "standard" cross-section and in terms of appropriate linkage with the accident files.)

Table 1. HSIS roadway mileage by roadway category (2012 data).
Roadway Category Mileage
Urban freeways 1,008.68
Urban freeways < 4 Lanes 8.438
Urban multilane divided non-freeways 1,510.16
Urban multilane undivided non-freeways 625.996
Urban 2 In highways 13,754.83
Rural freeways 977.619
Rural freeways < 4 Ins 8.376
Rural multilane divided non-freeways 1,070.51
Rural multilane undivided non-freeways 158.2
Rural 2 In highways

55,533.95

Other 4395.278
Total 79,052.04

The basic HSIS Inventory File contains both route description variables and cross-section variables that would be considered common among state inventory files. It includes such "standard" items as right and left shoulder width and type, lane widths, number of lanes, median width and type, roadway surface description, AADT, percent trucks, and others. In addition, it contains information on terrain, whether a section is a HPMS sample section, information on total truck percentages for certain roadway sections, and an indication of traffic growth factors for sections for which such growth factors have been developed.

While there is no construction zone inventory or project history file in North Carolina, each section of roadway in the basic inventory file contains an “improvement type” flag, which provides the general type of the most recent improvement implemented. This would differentiate between renovation, repaving, major rationing, minor rationing, and traffic safety/traffic engineering improvements. However, it does not provide the types of traffic safety/engineering improvement actually done. The improvement flag is based on construction plans and other sources identified above. Unfortunately, the companion variable related to the year of the last improvement was discontinued in 2009. 

The major gaps in the inventory information include intersection/interchange inventory information, passing sight distance, design speed and design volume, information on inside shoulders on divided roadways (as discussed below) and, most importantly, information on either horizontal curve or vertical grade data. In addition, there is no current computerized intersection inventory information available. Inventory information does exist on a separate file related to traffic signals. At this point it is not readily mergeable with the location file

Examination of the single variable tables for key variables in the file indicates very little uncoded mileage for most of the variables -- less than 1.5%. The main problem variables are with the right and left "shoulder type" and "shoulder width," which are coded as "unknown" in over ten percent of the cases. Conversations with DOT staff indicated that this lack of inventory information involves both missing data and the inventory practices on divided roadways. On these divided roadways, "right shoulder" is indeed the outer shoulder on the right in the direction of inventory. However, in the base file, "left shoulder" actually refers to the outer shoulder on the far left side of the roadway, across the opposing lanes of travel. This is unlike other states where "left shoulder" on a divided roadway refers to inside, or median shoulder. Thus, for almost all of the divided roadways in North Carolina, there is no information on the inside, or median shoulder. There is information on median type and width, with the width being measured from the edge of the traveled lane, thus including the inside shoulder.

To determine the accuracy within the roadway file, both user and data maintaining groups within the North Carolina DOT were questioned, and a set of runs of variables that should be similar were compared to each other. Both the data maintenance and users staffs indicated that they felt the data in the universe file to be quite accurate. Field checks of the data in the HPMS samples have been done by the headquarters inventory staff, and indicate that the data accurately represented the cross sections of the roadway. As is the case for most states, the percent trucks assigned to each section are not as accurate as would be desired.

We also attempted to determine if there was consistency between variables for similar variables found in the Inventory File. In general, there was. For example, speed limit appeared to be consistent with functional class. Median type (including undivided) and median width were quite consistent in terms of miles in each category. There are two variables related to urban/rural location, with some differences indicated in the mileage that might be considered "rural" or "urban". One is "Population Group" (including "unincorporated"), and the second is "Urban/Rural Designated by Population”. “Population Group” variable indicates that about 93% of the roads fall within rural areas, whereas “Urban/Rural Designated Population” indicates about 89% of the roads fall within rural areas.

Conversations with the DOT staff indicated that each is based on slightly different definitions. "Population Group" is based solely on whether the road segment is inside an incorporated town or city, regardless of city size. The second variable, "Urban/Rural Designation by Population" is based on a combination of incorporation and urbanized area classifications. In short, the two define slightly different categories, and, according to the DOT staff, neither is considered to be a better measure of the overall nature of the roadway (i.e., design, roadside, nature of surrounding area, etc.). In general, the roadway inventory file contains a large amount of mileage when compared to other state systems, and the data in the file appear to be quite accurate.

Finally, there remain inconsistencies across time with the variables related to “Total Truck Percent” and “Percent Trucks at Peak.” The latter is uncoded for over 75% of the mileage for all years and is discontinued in 2009.  The variable “Total Truck Percent” is uncoded for approximately 90% of the mileage for pre-2000 years, but is present for between 94% and 98% of the mileage for 2000-2011. It should be noted that the 2009-2011 percentages are still based on the older “legacy” estimates and not on the new method of estimating AADT which began in 2009. The 2012 truck percentage estimates are based on the newer method described in the Traffic Data section below, and are felt to be more accurate than the earlier legacy estimates.

Traffic data

As indicated above, significant improvements to the NC traffic data collection and AADT assignment efforts were made in 2010. The following describes the current program. The Traffic Survey Group of the NCDOT manages a Traffic Monitoring System (TMS) that generates AADT and truck percentage data used in the HSIS. The NCDOT GIS Unit publishes AADT data in the Road Characteristics file and the Traffic Survey Group publishes both AADT and truck data in an ESRI shape file. The TMS consists of a Continuous Count Program, a Coverage Count Program, and a Project Count Program. The Continuous Count Program involves the continuous 24-hour collection of volume, vehicle classification, and truck weight data at a sample of locations across the state. Continuous count sites are located on all types of highway facilities in all regions of the state. Approximately 70 Automatic Traffic Recording stations collect volume data (ATRs) and 44 legacy Weigh-In-Motion stations collected vehicle classification and truck weight data (WIMs). Continuous counts are screened for data quality and used to generate seasonal factors and statistics to support the Coverage and Project Count programs.

The Coverage Count Program involves the collection of short-term volume and vehicle classification counts to provide “coverage” of the major highway systems in North Carolina. Data are collected for 48 hours at each station at periodic intervals. There are approximately 48,000 volume-monitoring stations and 3,000 vehicle classification-monitoring stations. Using seasonal factors generated from the Continuous Count stations, the volume counts are factored to generate Annual Average Daily Traffic (AADT) estimates. This data are screened for consistency with historic trends at a station (temporal) and consistency between neighboring stations (spatial). Interstate mainline counts are collected every 5 to 8 interchanges and ramp counts are collected at all interchanges. Mainline interstate counts are factored to generate AADTs at these stations. AADT estimates on intervening segments are calculated by balancing the ramp volumes at interchanges between mainline count stations. Approximately 25,000 monitoring stations are updated annually including all interstate stations. All stations except interstates within major urban planning areas are updated biennially, half of the urban areas being updated each year. All primary route stations in rural areas are updated annually. Stations on rural secondary routes are updated biennially, approximately half of the stations each year. Stations not updated based on a new count during a reporting year have AADT estimated by applying growth factors to the previous count based AADT. Growth factors are calculated using count based AADT data only and are generated and applied by county or major urban area. This process generates a comprehensive volume coverage on all routes with a functional classification above Local. A partial coverage of Local routes is generated also. AADT data are used in Highway Performance Monitoring System (HPMS) reporting to FHWA, calculation of vehicle miles traveled (VMT), and support many processes within the NCDOT.

Vehicle classification counts are collected to provide a coverage of truck data for NC truck routes and National Highway System (NHS) routes. Vehicle classification counts are screened for data quality, seasonally factored to generate annual average volumes and percentages by vehicle class, and compared to historic values at the same station. This data are used to meet HPMS truck monitoring requirements, generate statewide average distributions, and are used for air quality modeling. Annualized truck volumes and percentages are generated for each count station. Vehicle classification coverage counts are updated on a three-year cycle.

The statistics generated from the data collected at the monitoring stations described above are applied to an extent of highway, called traffic segments. The minimum segmentation of the highway system for AADT traffic segments is related to the Functional Classification system (FC). For non-freeway routes, minimum segmentation is generated on a monitored route by the crossing routes with an FC above Local.  When a segment is excessively long, or where land use causes high traffic variability along a segment, it will be subdivided into smaller traffic segments to provide a better representation of travel on the route. Freeway routes are segmented for AADT by their interchanges. Each segment extends from the center of an interchange to the center of the next interchange. Traffic segments on divided highways are generated for the inventory direction of the route only (this is defined by the GIS Unit). AADT reported on these segments are total travel for both directions. A volume monitoring station is maintained on each AADT traffic segment.  The AADT data generated at the stations are reported on the AADT traffic segments. These segments are maintained and new segments added by the Traffic Survey Group when changes in the highway system are published by the GIS Unit. For monitoring stations located on Local FC, segments are not directly maintained. A segment reference is captured by performing a spatial join between the station points and the LRS arcs published by the GIS Unit. This method associates the AADT data with a portion of the route the AADT applies to but does not define where the extent of this AADT ends. For most segments captured using this technique, the actual extent of the AADT extends beyond the segment being reported.

With respect to truck traffic data, note that the updated truck percentages begin with the 2012 HSIS file rather than the 2009 file. Truck percentage data for 2009 - 2011 were still based on the legacy system, and would not be expected to be as accurate as the 2012 and later data. The 2012 and later vehicle classification data is collected to provide a coverage of truck data on NC truck routes and the NHS. No truck data are reported on routes that are not a truck or NHS route. There are 3,000 truck traffic segments across the state, each containing a vehicle classification monitoring station.  For non-freeway routes, the minimum segmentation for truck traffic segments is related to the designated truck routes and NHS routes. Minimum segments are generated on a monitored non-freeway route where a truck route or NHS route intersects that route. Segmentation on freeway routes is generated using a two-step process. Major segments on a freeway are setup where other freeway routes intersect them. These segments are then subdivided where intersecting truck routes have higher truck volumes. Due to the high volume of trucks traveling on freeways, low volume truck routes have little effect on the volume of trucks on a freeway and additional segmentation is unnecessary.

In general, most truck traffic segments are comprised of multiple AADT segments. The annualized truck percentages generated from the vehicle class count data is assigned to each AADT segment that falls within a truck segment. Annual average truck volumes are then generated by applying the annualized truck percentages to the AADT data assigned to each AADT segment. This method ensures that truck travel estimates are synchronized with total travel estimates. 

Finally, the Project Count Program within NCDOT provides traffic data collection services to support urban transportation modeling studies, traffic forecasting for TIP projects, and other transportation engineering studies. Services provided include the collection of daily, hourly, and vehicle classification counts using portable counters and turning movement and vehicle classification counts collected manually. Traffic counts are requested to provide more detailed traffic flows within a study area. A study will typically require a variety of data types collected at numerous locations. Counts are screened for data quality and consistency and are factored when requested. Approximately 1,400 portable counts and 400 manual counts are collected annually within the program. (It is noted that HSIS does not capture these counts, since there is no NC intersection inventory file. However, the counts could be used if such a file is developed in the future.)

Issues Related to Developing and Merging Files

As noted above, the accident data are subdivided into three subfiles -- accident, vehicle and occupant. These subfiles can be linked together using the "case number" variable, which includes the accident year (i.e., CASENO) present in each of the three files. When linking the occupant subfile, the additional linking variable "vehicle number" (i.e., VEHNO) must match so that the occupants are associated with the vehicle in which they were traveling. To link the Vehicle subfile with the Accident alone, first sort both subfiles by case number. To link the Occupant file with the other two subfiles, first sort both the Vehicle subfile and Occupant subfile by case number and vehicle position number. Next sort the Accident subfile by case number. Alternatively, the separate subfiles can be linked by specifying an SQL JOIN operation with the constraining condition that case number and vehicle number from each table are equal. SQL processing does not require the data to be pre-sorted and the output will not be in any particular sort order unless ORDER BY is specified. The Accident subfile can then be linked with the Roadway Inventory File using information related to county, route number, and milepost on the route. The actual linkage variables on the Accident file that are used in the merging operation are COUNTY, ROUTE and MILEPOST. To prepare the Accident subfile for linking with the Roadway Inventory File using a SAS data step process, the analyst must sort both the Accident and the Roadway File into location order (by COUNTY, ROUTE and MILEPOST on the Accident file and by COUNTY, RTE_NBR and BEGMP on the Roadway File). For the alternative SQL join, the analyst must specify an exact match on COUNTY, an exact match on ROUTE with RTE_NBR and a range match where MILEPOST occurs between BEGMP and ENDMP. (Programs to accomplish this merging and division are documented in the HSIS Programmer's Guidebook, available at FHWA.)

Finally, where appropriate and possible, a format, which defines categories within a given variable, has been developed for HSIS SAS variables. These categories are shown in the pages below. These formats have been saved in a format library, which can be provided to the user. As a naming convention, the "format name" is the same as the variable name; with the only exception being for certain character variables (in contrast with numeric variables). More specifically, a SAS format name has to be preceded by a "$" if the variable is character in nature. There is an 8-character length limit on both variable name and format name. In cases where the variable name is already eight characters in length, the addition of the preceding "$" would make the format name one character too long. In these cases, the format name is the same as the variable name except the final character of the variable name is dropped.

Composite List of Elements

SAS VARIABLE NAME DESCRIPTION SAS VARIABLE FILE FORMAT TYPE PAGE NO
AADT AVER ANNUAL DAILY TRAFFIC Roadway NUM (8) 129
AADT_YR YEAR OF ADT Roadway CHAR (2) 129
ACC_DATE ACCIDENT DATE-MMDDYY Accident NUM (8) 31
ACCESS ACCESS CONTROL Accident NUM (8) 31
ACCESS ACCESS CONTROL Roadway CHAR (1) 130
ACCTYPE FIRST HARMFUL EVENT Accident NUM (8) 31
ACCYR ACCIDENT YEAR Accident CHAR (4) 32
ACTION DRIVER CHARGED WITH VIOL Vehicle CHAR (1) 71
ADD_DAMG ADDITIONAL PROPERTY DAMAGE Accident NUM (8) 33
AGE OCCUPANT AGE Occupant NUM (8) 120
AGENCY INVESTIGATING AGENCY Accident CHAR (1) 34
AIR_SW AIRBAG SWITCH STATUS Occupant NUM (8) 121
AIRBAGS AIR BAGS PRESENT IN VEH Vehicle CHAR (1) 71
AIRDEPL AIRBAGS DEPLOYED DURING CRASH Vehicle CHAR (1) 72
AIRDEPL AIRBAG DEPLOYED Occupant NUM (8) 121
ALC_DRUG ALCOHOL/DRUG IN ACC Vehicle NUM (8) 72
ALCFLAG ALCOHOL/DRUGS IN ACC Accident CHAR (1) 34
ALCFLAG ALCOHOL FLAG Vehicle CHAR (1) 72
AMB_TIME TIME OF AMBULANCE REQUEST Accident CHAR (4) 34
AMBUL AMBULANCE REQUESTED Accident CHAR (1) 34
AMTDAMG AMOUNT OF DAMAGE TO VEH Vehicle NUM (8) 73
AREATYPE AREA TYPE Roadway CHAR (1) 130
AXLE_NBR COMMERCIAL CARRIER AXLES Vehicle NUM (8) 73
AXLES NUMBER OF AXLES FOR TRL#1 Vehicle NUM (8) 74
AXLES2 NUMBER OF AXLES FOR TRL#2 Vehicle NUM (8) 74
BEGMP BEGIN MILEPOST Roadway NUM (8) 130
BIKEFLAG BICYCLE IN ACC Accident CHAR (1) 35
BIKEFLAG BICYCLE FLAG Vehicle CHAR (1) 74
BODY CARGO BODY TYPE Vehicle NUM (8) 74
CASENO YEAR + CASE NUMBER Accident NUM (8) 35
CASENO NC ACCIDENT NUMBER WITH YR Vehicle NUM (8) 75
CASENO NC ACCIDENT NUMBER WITH YR Occupant NUM (8) 121
CC_CITY COMMERCIAL CARRIER CITY Vehicle CHAR (22) 75
CC_STATE COMMERCIAL CARRIER STATE Vehicle CHAR (2) 75
CC_ZIP COMMERCIAL CARRIER ZIP CODE Vehicle CHAR (9) 75
CCB_CITY COMM CARR BUSINESS CITY Vehicle CHAR (2) 75
CCB_STAT COMM CARR BUSINESS STATE Vehicle NUM (8) 75
CDL_IND CDL INDICATOR Vehicle CHAR (1) 76
CITY CITY/TOWN CODE (INCL CO) Accident NUM (8) 35
CNT_SEAT NUMBER OF SEATS OCCUPIED Vehicle CHAR (1) 76
CNTR_PEAK_ NUMBER OF LANES IN THE DIRECTION OPPOSITE TO THE PEAK HOUR DIRECTION FLOW Roadway NUM (8) 130
CNTY_RTE COUNTY ROUTE NUMBER Accident CHAR (10) 35
CNTYRTE COUNTY ROUTE NUMBER Roadway CHAR (10) 131
COMMFLAG COMMERCIAL VEHICLE IN ACC Accident CHAR (1) 35
CONTRIB1 VIOL/CONTRIBUT FACTOR #1 Vehicle NUM (8) 76
CONTRIB2 VIOL/CONTRIBUT FACTOR #2 Vehicle NUM (8) 76
CONTRIB3 VIOL/CONTRIBUT FACTOR #3 Vehicle NUM (8) 76
CONTRIB4 VIOL/CONTRIBUT FACTOR #4 Vehicle NUM (8) 76
CONTRIB5 VIOL/CONTRIBUT FACTOR #5 Vehicle NUM (8) 76
COUNTY NC COUNTY NUMBER Accident NUM (8) 36
COUNTY COUNTY Roadway CHAR (2) 131
CROSSMED CROSS MEDIAN Vehicle CHAR (1) 77
DAMSEV TAD#1 SEVERITY Vehicle CHAR (1) 78
DAMSEV2 TAD#2 SEVERITY Vehicle CHAR (1) 78
DAMSEV3 TAD#3 SEVERITY Vehicle CHAR (1) 78
DAY DAY OF THE MONTH Accident CHAR (2) 38
DEPT_CDE REPORTING DEPARTMENT CODE Accident CHAR (9) 39
DEVELOP DEVELOPMENT AMOUNT Accident CHAR (8) 39
DHRVOL DESIGN HOUR VOLUME Roadway CHAR (2) 132
DIR_TRVL DIRECT OF TRAVEL ON Vehicle CHAR (2) 78
DIV HIGHWAY DIVISION ROUTE Roadway CHAR (2) 132
DRG_RES DRIVER ALC/DRUG TEST RESULT Vehicle CHAR (8) 79
DRG_SUSP DRIVER ALC/DRUG SUSPECTED Vehicle CHAR (8) 79
DRSTATE OUT OF STATE DRIVERS LIC Vehicle CHAR (1) 79
DRV_AGE DRIVER/PEDEST AGE Vehicle CHAR (3) 79
DRV_BAC DRIVER BLOOD ALCOHOL IN % Vehicle NUM (8) 80
DRV_CITY DRIVER CITY Vehicle CHAR (1) 80
DRV_DOB DRIVER DATE OF BIRTH Vehicle NUM (8) 80
DRV_INJ DRIVER/PEDESTRIAN INJURY Vehicle CHAR (1) 81
DRV_LICENSE_RESTRICT DRIVERS LICENSE RESTRICT Vehicle NUM (8) 81
DRV_RACE DRIVER/PEDEST RACE Vehicle CHAR (1) 82
DRV_REST DRIVER RESTRAINT USAGE Vehicle CHAR (2) 82
DRV_SEAT DRIVER/PEDEST SEAT POS Vehicle CHAR (1) 83
DRV_SEX DRIVER/PEDEST SEX Vehicle CHAR (1) 83
DRV_ZIP DRIVER ZIP CODE Vehicle CHAR (9) 83
EJECT EJECTION Occupant NUM (8) 121
EMERGUSE EMERGENCY VEHICLE USE Vehicle NUM (8) 83
EMS_DES EMERGENCY MEDICAL SERVICE Occupant NUM (50) 122
ENDMP ENDING MILEPOST Roadway NUM (8) 132
EVENT1 SEQUENCE OF EVENTS 1 Vehicle NUM (8) 84
EVENT2 SEQUENCE OF EVENTS 2 Vehicle NUM (8) 84
EVENT3 SEQUENCE OF EVENTS 3 Vehicle NUM (8) 84
EVENT4 SEQUENCE OF EVENTS 4 Vehicle NUM (8) 84
EXPR_DT LICENSE EXPIRATION DATE Vehicle NUM (8) 86
FIRE POSTCRASH FIRE Vehicle NUM (8) 86
FRM_RD FROM ROAD Accident CHAR (8) 39
FRMRD_CL FROM ROAD CLASS Accident CHAR (4) 39
FROM_DIR DIRECTION FROM FRM_RD Accident CHAR (2) 40
FUNC_CLS FUNCTIONAL CLASS Roadway CHAR (2) 133
FUNC_ST FUNCTIONAL CLASS (STATE) Roadway CHAR (1) 133
GOV_OWN GOV OWNED VEH INDICATOR Vehicle CHAR (1) 86
GVWR_WGT COMM CARR GROSS VEH WEIGHT Vehicle NUM (8) 86
HAZ_NUM1 1 DIGIT HAZMAT NUM PLACARD Vehicle NUM (8) 86
HAZ_NUM4 4 DIGIT HAZMAT NUM PLACARD Vehicle CHAR (4) 87
HAZ_PLAC HAZMAT PLACARD INDICATOR Vehicle CHAR (1) 87
HAZFLAG HAZMAT VEHICLE IN ACC Accident CHAR (1) 40
HAZMAT HAZARDOUS CARGO Vehicle CHAR (1) 87
HITRUN HIT AND RUN ACC Accident CHAR (1) 40
HOUR HOUR Accident CHAR (4) 41
HOV_LN_CNT NUMBER OF HOV LANES Roadway NUM (8) 133
HOV_TYD_CD TYPE OF LANES USED FOR HOV EXCLUSIVELY OR DURING SPECIFIED TIME PERIODS Roadway NUM (8) 133
HPMS1 HPMS SAMPLE ID Roadway NUM (8) 133
IMPACTFT DIST TRAVEL AFTER IMPACT Vehicle NUM (8) 87
IMPACTSP IMPACT SPEED Vehicle NUM (8) 88
IMPROVE1 TYPE OF RECENT IMPROVEMENT Roadway CHAR (2) 134
INJ OCCUPANT INJURY Occupant NUM (8) 122
INSURED INSURANCE INDICATOR Vehicle CHAR (1) 89
INTOXC DRIVER INTOXICATION GROUP Vehicle NUM (8) 89
INTSTMP INTERSTATE MILEPOST Roadway CHAR (5) 134
INV_CNTL INVENTORY CONTROL Roadway CHAR (1) 135
L_PERMIT LEARNER PERMIT Vehicle CHAR (1) 89
LENGTRL LENGTH OF TRAILER #1,IN FT Vehicle NUM (8) 89
LENGTRL2 LENGTH OF TRAILER #2,IN FT Vehicle NUM (8) 89
LIC_IND DRIVER LICENSE INDICATOR Vehicle CHAR (1) 90
LIC_STAT LICENSE STATE Vehicle CHAR (2) 90
LICRESTR RESTRICT ON DRIV LICENSE Vehicle CHAR (2) 90
LICTYPE TYPE OF DRIVERS LICENSE Vehicle CHAR (1) 91
LIGHT LIGHT CONDITION Accident NUM (8) 42
LISTCNTL LIST CONTROL Roadway CHAR (1) 135
LOC_TYPE ACCIDENT LOCATION TYPE Accident NUM (8) 42
LOCALITY DEVELOPMENT TYPE Accident NUM (8) 43
LSHL_TYP LEFT SHOULDER TYPE Roadway CHAR (2) 136
LSHLDWID LEFT SHOULDER WIDTH Roadway NUM (8) 137
LT_PARK LEFT PEAK PARK Roadway CHAR (1) 137
MAKE VEHICLE MAKE Vehicle CHAR (2) 91
MAKENAME VEHICLE MAKE NAME Vehicle CHAR (20) 91
MANEUVER VEH MANEUVER/PEDEST ACTION Vehicle NUM (8) 92
MCFLAG MOTORCYCLE IN ACC Accident CHAR (1) 44
MEANS MEANS OF INVOLVEMENT Accident CHAR 44
MED_TYPE MEDIAN TYPE Roadway CHAR (1) 137
MEDWID MEDIAN WIDTH TOTAL Roadway NUM (8) 138
MHARM_AC MOST HARMFUL EVENT Accident NUM (8) 45
MILEPOST MILEPOST Accident NUM (8) 45
MISCACT1 MISCELLANEOUS ACTION Vehicle CHAR (2) 93
MONTH MONTH OF ACCIDENT Accident CHAR (2) 46
MOPEDFLG MOPED IN ACCIDENT Accident CHAR (1) 46
MOSTHARM MOST HARMFUL EVENT Vehicle NUM (8) 94
MUNI_DIR DIRECTION FROM MUNICIPALITY TO ACC Accident CHAR (2) 47
MUNI_DIS DISTANCE FROM MUNICIPALITY IN MILES Accident NUM (8) 47
MVMT MILLION VEHICLE MILLIONS OF TRAVEL Accident NUM (8) 47
MVMT MILLION VEHICLE MILES TRAVELLED Roadway NUM (8) 138
NBR_LANE NUMBER OF LANES Accident NUM (8) 48
NEARTOWN IN OR NEAR TOWN Accident NUM (8) 48
NHS NATIONAL HIGHWAY SYSTEM Roadway CHAR (1) 138
NO_LANES NUMBER OF LANES- TOTAL Roadway CHAR (1) 139
NON_REP NON-REPORTABLE Accident NUM (8) 48
NONMTCNT NON-MOTORIST COUNT Accident NUM (8) 49
NUM_A TOTAL A INJURIES IN VEH Vehicle CHAR (2) 96
NUM_B TOTAL B INJURIES IN VEH Vehicle CHAR (2) 96
NUM_C TOTAL C INJURIES IN VEH Vehicle CHAR (2) 96
NUM_K TOTAL KILLED IN VEHICLE Vehicle CHAR (2) 96
NUM_OCCS TOTAL OCCUPANTS IN VEH Vehicle CHAR (2) 96
NUM_POCS NO OF POINTS OF CONTACT Vehicle CHAR (1) 96
NUM_TADS NUMBER OF TAD CODES Vehicle CHAR (1) 96
NUM_UNIT NUMBER OF UNITS Accident NUM (8) 49
NUMINJ TOT INJURED IN VEH (K+A+B+C) Vehicle CHAR (2) 96
NUMVEHS NUMBER OF VEH+PED+BIKE Accident NUM (8) 49
NUMVIOLS NUM OF VIOLS INDICATED Vehicle CHAR (1) 97
OBJECT1 TYPE OF OBJECT STRUCK Vehicle CHAR (2) 97
OFFCR_ST REPORTING OFFICER STATE Accident CHAR (2) 49
ON_RD ON ROAD Accident CHAR (8) 49
ON_RD ON ROAD Vehicle CHAR (8) 98
ONEWAY_DIR ONE WAY DIRECTION Roadway NUM (8) 139
ONRD_CL ON ROAD CLASS Accident CHAR (4) 50
ONRD_CL ON ROAD CLASS Vehicle CHAR (4) 99
OTH_UNIT OTHER UNIT TYPE Vehicle CHAR (20) 99
OUTSTATE OUT OF STATE VEH REGIS Vehicle CHAR (1) 99
OWN_CITY VEHICLE OWNER CITY Vehicle CHAR (22) 99
OWN_STAT VEHICLE OWNER STATE Vehicle CHAR (2) 100
OWN_ZIP VEHICLE OWNER ZIP CODE Vehicle CHAR (9) 100
OWNERTYP OWNER CATEGORY Vehicle CHAR (3) 100
PARK_VEH INDICATOR OF PARKED VEH Vehicle CHAR (1) 100
PATROLAC PATROL AREA CODE Accident CHAR (2) 50
PAVECOND PAVEMENT CONDITION Roadway CHAR (2) 139
PAVED_LSHLDWID PAVED SHOULD WIDTH (LEFT) Roadway NUM (8) 139
PAVED_RSHLDWID PAVED SHOULD WIDTH (RIGHT) Roadway NUM (8) 139
PCT_TRK1 PERCENT TRUCKS Roadway CHAR (2) 140
PEAK_TRK PERCENT TRUCKS AT PEAK Roadway CHAR (1) 140
PEAKLANE NUMBER OF LANES IN THE PEAK HOUR DIRECTION OF FLOW Roadway NUM (8) 141
PED_LOC NON-MOTORIST LOCATION Vehicle NUM (8) 101
PEDACT NON-MOTORIST ACTION Vehicle NUM (8) 102
PEDCONT1 CONTRIB CIRCUM NON-MOT 1 Vehicle NUM (8) 103
PEDCONT2 CONTRIB CIRCUM NON-MOT 2 Vehicle NUM (8) 103
PEDFLAG PEDESTRIAN IN ACC Accident CHAR (1) 50
PEDFLAG PEDESTRIAN IN ACCIDENT Vehicle CHAR (1) 103
PEDHITBY PUPIL PEDEST STRUCK BY (SCHLBUS CRASH) Vehicle CHAR (1) 104
PHYSCOND PHYSICAL COND OF DRIVER Vehicle NUM (8) 104
PLOTQUAL QUALITY OF MILEPOST Accident CHAR (1) 51
POP_GRP CITY POPULATION IN 1000 Accident NUM (8) 51
POP_GRP POPULATION GROUP Roadway CHAR (1) 141
PROPDAM TOTAL PROPERTY DAMAGE Accident NUM (8) 52
PRSN_CTY PERSON COUNTY Occupant CHAR (22) 122
PRSN_DOB PERSON DATE OF BIRTH Occupant NUM (8) 122
PRSN_NBR PERSON NUMBER Occupant NUM (8) 122
PRSN_ST PERSON STATE Occupant CHAR (2) 123
PRSN_TYP PERSON TYPE Occupant NUM (8) 123
PRSN_ZIP PERSON ZIP CODE Occupant CHAR (9) 123
PSTD_RTE_C POSTED ROUTES Roadway CHAR (7) 141
PTCONT1 POINT OF CONTACT #1 Vehicle CHAR (2) 105
PTCONT2 POINT OF CONTACT #2 Vehicle CHAR (2) 105
PTCONT3 POINT OF CONTACT #3 Vehicle CHAR (2) 105
PTCONT4 POINT OF CONTACT #4 Vehicle CHAR (2) 105
PTCONT5 POINT OF CONTACT #5 Vehicle CHAR (2) 105
PTCSTAT PORTABLE TRAFFIC COUNTER Roadway CHAR (8) 142
PVA PUBLIC VEHICLE AREA Accident CHAR (2) 52
RACE OCCUPANT RACE Occupant NUM (8) 123
RD_CHAR1 ROAD CHARACTER Accident NUM (8) 53
RD_CONF ROAD CONFIGURATION Accident NUM (8) 53
RD_PAVE TYPE OF ROAD SURFACE (REP) Accident NUM (8) 54
RD2OBJST DISTANCE TO OBJECT STRUCK Vehicle NUM (8) 106
RDSURF SURFACE CONDITION Accident NUM (8) 54
RECCONTCD RECORD CONTINUATION CODE Roadway CHAR (1) 142
REFDISFT DIST FROM FRM_RD IN FEET Accident NUM (8) 54
REFDISMI DIST FROM FRM_RD IN MILES Accident NUM (8) 55
REGION REGION OF IMPACT Vehicle CHAR (1) 107
REL_RD RELATION TO ROADWAY Accident NUM (8) 55
REPORT REPORTABLE STATUS Accident CHAR (1) 55
REST1 OCCUPANT RESTRAINT Occupant NUM (8) 124
RMP_SVRD RAMP OR SERVICE ROAD Accident NUM (8) 56
ROAD_CLS ROAD CLASSIFICATION Accident NUM (8) 56
ROADCNT1 ROADWAY CONTRIBUT CIRCUM 1 Accident NUM (8) 57
ROADCNT2 ROADWAY CONTRIBUT CIRCUM 2 Accident NUM (8) 57
RODWYCLS ROAD WAY CLASS Accident CHAR (2) 57
RODWYCLS ROAD WAY CLASS VARIABLE Roadway CHAR (2) 142
ROLLOVER VEHICLE ROLLOVER Vehicle CHAR (1) 107
ROLLPTCT ROLLOVER, POINT OF CONTACT Vehicle NUM (8) 107
ROLLTAD ROLLOVER, TAD SEVERITY Vehicle NUM (8) 108
ROUGH PAVEMENT ROUGHNESS Roadway CHAR (3) 142
ROW RIGHT OF WAY Roadway CHAR (2) 143
RRX_NUM RAIL ROAD CROSSING NUMBER Accident CHAR (7) 58
RRXFLAG RAILROAD CROSS NOT INDICATED Accident CHAR (1) 58
RSHL_TYP RIGHT SHOULDER TYPE Roadway CHAR (2) 143
RSHLDWID RIGHT SHOULDER WIDTH Roadway NUM (8) 144
RT_PARK RIGHT PEAK PARK Roadway CHAR (1) 144
RTE_NBR MILEPOSTED ROUTE Accident CHAR (8) 58
RTE_NBR ROUTE INVENTORIED Roadway CHAR (8) 144
RTE_TYPE ROUTE TYPE (1ST DIGIT OF RTE_NBR) Roadway CHAR (1) 145
RULURBID RURAL URBAN IDENTIFICATION Roadway CHAR (2) 145
RURURB RURAL-URBAN IDENTIFICATION Accident CHAR (1) 58
SCENIC SCENIC BYWAY Roadway CHAR (1) 145
SCH_BUS1 SCHOOL BUS CONTACT VEH Vehicle NUM (8) 108
SCH_BUS2 SCHOOL BUS NON-CONTACT VEH Vehicle NUM (8) 108
SCHBUS SCHOOL BUS INVOLVED IN ACC Accident CHAR (1) 58
SEATPOS SEATING POSITION Occupant NUM (8) 124
SEG_LNG SECTION LENGTH IN MILES Roadway NUM (8) 145
SEVERITY WORST INJURY IN ACC Accident CHAR (1) 59
SEX OCCUPANT SEX Occupant NUM (8) 125
SIGHTDIS SIGHT DISTANCE Roadway CHAR (2) 145
SOB_TEST CHEMICAL TEST GIVEN Vehicle NUM (8) 109
SPD_GRP COMPUTED SPEED OF ACCIDENT Accident CHAR (1) 59
SPD_LIMT SPEED LIMIT Roadway CHAR (2) 145
SPDLIM POSTED SPEED LIMIT Vehicle NUM (8) 109
SPEC_SYS SPECIAL SYSTEM Roadway CHAR (1) 146
SPILL HAZARDOUS CARGO SPILL Vehicle CHAR (1) 110
STATE_SY STATE HIGHWAY SYSTEM Roadway CHAR (1) 147
STRCTR_CD LOCATION OF BRIDGES, TUNNEL AND CAUSEWAYS Roadway NUM (8) 147
STREET_NAM STREET NAME Roadway NUM (20) 148
SURF_TYP SURFACE TYPE Roadway CHAR (2) 148
SURF_WID SURFACE WIDTH TOTAL Roadway NUM (8) 148
TERRAIN TERRAIN Roadway CHAR (1) 148
TICKET1 CITATION ISSUED TO SOMEONE IN ACCIDENT Accident CHAR (1) 59
TIME TIME OF DAY (24 HOUR) Accident CHAR (4) 60
TIRESKID TIRE IMPRESSIONS IN FEET Vehicle NUM (8) 110
TO_DIR DIRECTION TOWARD Accident CHAR (2) 61
TO_RD TOWARD ROAD Accident CHAR (8) 61
TOLL_DIRECTION TOLL CHARGED Roadway CHAR (7) 149
TORD_CL TOWARD ROAD CLASS Accident CHAR (4) 61
TOT_KILL TOTAL KILLED IN ACC Accident NUM (8) 62
TOTAINJ TOTAL A INJURIES IN ACC Accident NUM (8) 62
TOTBINJ TOTAL B INJURIES IN ACC Accident NUM (8) 62
TOTCINJ TOTAL C INJURIES IN ACC Accident NUM (8) 62
TOTLENG TOT LENGTH OF TRAILER(S) IN FEET Vehicle CHAR (3) 110
TOWAWAY VEHICLE DRIVEABLE Vehicle NUM (8) 111
TOWED_BY TOWED BY Vehicle CHAR (50) 111
TOWED_TO TOWED TO Vehicle CHAR (50) 111
TOWN TOWN Roadway CHAR (2) 149
TOWN_CD DOT ASSIGNED TOWN CODE Accident NUM (8) 62
TRAPPED TRAPPED Occupant NUM (8) 125
TRF_CNTL TRAFFIC CONTROL TYPE Accident NUM (8) 63
TRF_OPER TRAFFIC CONTROL OPERATING Accident NUM (8) 63
TRF_VIS TRAFFIC CONTROL VISIBLE Accident CHAR (8) 63
TRFGROW TRAFFIC GROWTH FACTOR Roadway NUM (8) 149
TRK_RTE DESIGNATED TRUCK ROUTE Roadway CHAR (1) 149
TRL_TYPE TRAILER TYPE Vehicle NUM (8) 111
TRL1_FLG DATA PRESENT (TRAILER #1) Vehicle CHAR (1) 112
TRL2_FLG DATA PRESENT (TRAILER #2) Vehicle CHAR (1) 112
TRNLNWD TURN LANE WIDTH Roadway NUM (8) 149
TRT_FAC TREATMENT FACILITY NAME Occupant CHAR (100) 125
TRVL_SPD ESTIMATED ORIGINAL SPEED Vehicle NUM (8) 112
UNDEROVR VEHICLE UNDERRIDE/OVERRIDE Vehicle NUM (8) 113
UNIT_TYP UNIT TYPE Vehicle CHAR (1) 113
UPDATE_ UPDATE Roadway NUM (8) 150
URB_LOC URBAN LOCATION Roadway CHAR (1) 150
URB_POP RUR/URB DESIGNATED BY POP Roadway CHAR (1) 150
V_DAMAG2 TAD#2 LOCATION Vehicle CHAR (2) 114
V_DAMAG3 TAD#3 LOCATION Vehicle CHAR (2) 114
V_DAMAGE TAD#1 (AREA OF DAMAGE) LOC Vehicle CHAR (2) 114
VEH_SEIZ VEHICLE SEIZURE DWI Vehicle CHAR (1) 114
VEH_DEF VEHICLE DEFECT Vehicle NUM (8) 115
VEHNO VEHICLE POSITION NUMBER Vehicle NUM (8) 115
VEHNO VEHICLE POSITION NUMBER Occupant NUM (8) 125
VEHON VEHICLE LOCATION BASED ON ROAD Vehicle CHAR (1) 115
VEHSEV SEVERITY Vehicle NUM (8) 115
VEHTYPE VEHICLE TYPE Vehicle NUM (8) 116
VEHYR MODEL YEAR OF VEHICLE Vehicle NUM (8) 117
VIN VEHICLE IDENTIFICATION NO Vehicle CHAR (17) 117
VIN_ID VEHICLE IDENTIFICATION NO Vehicle CHAR (25) 117
VISION VISION OBSTRUCTION Vehicle NUM (8) 118
WEATHER1 WEATHER CONDITION 1 Accident NUM (8) 64
WEATHER2 WEATHER CONDITION 2 Accident NUM (8) 64
WEEKDAY DAY OF WEEK Accident CHAR 64
WETHCONT WEATHER CONTRIBUT TO ACC Accident NUM (8) 64
WIDTRL WIDTH OF TRAILER #1 (IN) Vehicle NUM (8) 118
WIDTRL2 WIDTH OF TRAILER #2 (IN) Vehicle NUM (8) 118
WORKZONE WORK ZONE MARKED Accident NUM (8) 65
WTDSGSPD WEIGHTED DESIGN SPEED Roadway CHAR (2) 150
WZ_ACT WORK ZONE ACTIVITY Accident NUM (8) 65
WZ_AREA WORK ZONE AREA Accident NUM (8) 65
WZ_LOC WORK ZONE CRASH LOCATION Accident NUM (8) 65
Y_LINE NON-MILEPOSTED CROSSING ROUTE LOCATION Accident CHAR (1) 66
YEAR YEAR OF TRAFFIC COUNT Roadway NUM (8) 151
YR_IMPR1 YEAR OF RECENT IMPROVEMENT Roadway CHAR (2) 151
YRADD YEAR ADDED Roadway CHAR (2) 151
ZIP_ADR REPORTING OFFICER ZIP CODE Accident CHAR (9) 66

SAS File Formats

Crash Files

Accident Subfile

SAS VARIABLE NAME DESCRIPTION SAS VARIABLE FILE FORMAT TYPE PAGE NO
ACC_DATE ACCIDENT DATE-MMDDYY Accident NUM (8) 31
ACCESS ACCESS CONTROL Accident NUM (8) 31
ACCTYPE FIRST HARMFUL EVENT Accident NUM (8) 31
ACCYR ACCIDENT YEAR Accident CHAR (4) 32
ADD_DAMG ADDITIONAL PROPERTY DAMAGE Accident NUM (8) 33
AGENCY INVESTIGATING AGENCY Accident CHAR (1) 34
ALCFLAG ALCOHOL/DRUGS IN ACC Accident CHAR (1) 34
AMB_TIME TIME OF AMBULANCE REQUEST Accident CHAR (4) 34
AMBUL AMBULANCE REQUESTED Accident CHAR (1) 34
BIKEFLAG BICYCLE IN ACC Accident CHAR (1) 35
CASENO YEAR + CASE NUMBER Accident NUM (8) 35
CITY CITY/TOWN CODE (INCL CO) Accident NUM (8) 35
CNTY_RTE COUNTY ROUTE NUMBER Accident CHAR (10) 35
COMMFLAG COMMERCIAL VEHICLE IN ACC Accident CHAR (1) 35
COUNTY NC COUNTY NUMBER Accident NUM (8) 36
DAY DAY OF THE MONTH Accident CHAR (2) 38
DEPT_CDE REPORTING DEPARTMENT CODE Accident CHAR (9) 39
DEVELOP DEVELOPMENT AMOUNT Accident CHAR (8) 39
FRM_RD FROM ROAD Accident CHAR (8) 39
FRMRD_CL FROM ROAD CLASS Accident CHAR (4) 39
FROM_DIR DIRECTION FROM FRM_RD Accident CHAR (2) 40
HAZFLAG HAZMAT VEHICLE IN ACC Accident CHAR (1) 40
HITRUN HIT AND RUN ACC Accident CHAR (1) 40
HOUR HOUR Accident CHAR (4) 41
LIGHT LIGHT CONDITION Accident NUM (8) 42
LOC_TYPE ACCIDENT LOCATION TYPE Accident NUM (8) 42
LOCALITY DEVELOPMENT TYPE Accident NUM (8) 43
MCFLAG MOTORCYCLE IN ACC Accident CHAR (1) 44
MEANS MEANS OF INVOLVEMENT Accident CHAR 44
MHARM_AC MOST HARMFUL EVENT Accident NUM (8) 45
MILEPOST MILEPOST Accident NUM (8) 45
MONTH MONTH OF ACCIDENT Accident CHAR (2) 46
MOPEDFLG MOPED IN ACCIDENT Accident CHAR (1) 46
MUNI_DIR DIRECTION FROM MUNICIPALITY TO ACC Accident CHAR (2) 47
MUNI_DIS DISTANCE FROM MUNICIPALITY IN MILES Accident NUM (8) 47
MVMT MILLION VEHICLE MILLIONS OF TRAVEL Accident NUM (8) 47
NBR_LANE NUMBER OF LANES Accident NUM (8) 48
NEARTOWN IN OR NEAR TOWN Accident NUM (8) 48
NON_REP NON-REPORTABLE Accident NUM (8) 48
NONMTCNT NON-MOTORIST COUNT Accident NUM (8) 49
NUM_UNIT NUMBER OF UNITS Accident NUM (8) 49
NUMVEHS NUMBER OF VEH+PED+BIKE Accident NUM (8) 49
OFFCR_ST REPORTING OFFICER STATE Accident CHAR (2) 49
ON_RD ON ROAD Accident CHAR (8) 49
ONRD_CL ON ROAD CLASS Accident CHAR (4) 50
PATROLAC PATROL AREA CODE Accident CHAR (2) 50
PEDFLAG PEDESTRIAN IN ACC Accident CHAR (1) 50
PLOTQUAL QUALITY OF MILEPOST Accident CHAR (1) 51
POP_GRP CITY POPULATION IN 1000 Accident NUM (8) 51
PROPDAM TOTAL PROPERTY DAMAGE Accident NUM (8) 52
PVA PUBLIC VEHICLE AREA Accident CHAR (2) 52
RD_CHAR1 ROAD CHARACTER Accident NUM (8) 53
RD_CONF ROAD CONFIGURATION Accident NUM (8) 53
RD_PAVE TYPE OF ROAD SURFACE (REP) Accident NUM (8) 54
RDSURF SURFACE CONDITION Accident NUM (8) 54
REFDISFT DIST FROM FRM_RD IN FEET Accident NUM (8) 54
REFDISMI DIST FROM FRM_RD IN MILES Accident NUM (8) 55
REL_RD RELATION TO ROADWAY Accident NUM (8) 55
REPORT REPORTABLE STATUS Accident CHAR (1) 55
RMP_SVRD RAMP OR SERVICE ROAD Accident NUM (8) 56
ROAD_CLS ROAD CLASSIFICATION Accident NUM (8) 56
ROADCNT1 ROADWAY CONTRIBUT CIRCUM 1 Accident NUM (8) 57
ROADCNT2 ROADWAY CONTRIBUT CIRCUM 2 Accident NUM (8) 57
RODWYCLS ROAD WAY CLASS Accident CHAR (2) 57
RRX_NUM RAIL ROAD CROSSING NUMBER Accident CHAR (7) 58
RRXFLAG RAILROAD CROSS NOT INDICATED Accident CHAR (1) 58
RTE_NBR MILEPOSTED ROUTE Accident CHAR (8) 58
RURURB RURAL-URBAN IDENTIFICATION Accident CHAR (1) 58
SCHBUS SCHOOL BUS INVOLVED IN ACC Accident CHAR (1) 58
SEVERITY WORST INJURY IN ACC Accident CHAR (1) 59
SPD_GRP COMPUTED SPEED OF ACCIDENT Accident CHAR (1) 59
TICKET1 CITATION ISSUED TO SOMEONE IN ACCIDENT Accident CHAR (1) 59
TIME TIME OF DAY (24 HOUR) Accident CHAR (4) 60
TO_DIR DIRECTION TOWARD Accident CHAR (2) 61
TO_RD TOWARD ROAD Accident CHAR (8) 61
TORD_CL TOWARD ROAD CLASS Accident CHAR (4) 61
TOT_KILL TOTAL KILLED IN ACC Accident NUM (8) 62
TOTAINJ TOTAL A INJURIES IN ACC Accident NUM (8) 62
TOTBINJ TOTAL B INJURIES IN ACC Accident NUM (8) 62
TOTCINJ TOTAL C INJURIES IN ACC Accident NUM (8) 62
TOWN_CD DOT ASSIGNED TOWN CODE Accident NUM (8) 62
TRF_CNTL TRAFFIC CONTROL TYPE Accident NUM (8) 63
TRF_OPER TRAFFIC CONTROL OPERATING Accident NUM (8) 63
TRF_VIS TRAFFIC CONTROL VISIBLE Accident CHAR (8) 63
WEATHER1 WEATHER CONDITION 1 Accident NUM (8) 64
WEATHER2 WEATHER CONDITION 2 Accident NUM (8) 64
WEEKDAY DAY OF WEEK Accident CHAR 64
WETHCONT WEATHER CONTRIBUT TO ACC Accident NUM (8) 64
WORKZONE WORK ZONE MARKED Accident NUM (8) 65
WZ_ACT WORK ZONE ACTIVITY Accident NUM (8) 65
WZ_AREA WORK ZONE AREA Accident NUM (8) 65
WZ_LOC WORK ZONE CRASH LOCATION Accident NUM (8) 65
Y_LINE NON-MILEPOSTED CROSSING ROUTE LOCATION Accident CHAR (1) 66
ZIP_ADR REPORTING OFFICER ZIP CODE Accident CHAR (9) 66

Accident Date – MMDDYY
SAS Name: ACC_DATE

Definition: Date when the accident occurred.

Additional Information: Element has YYYYMMDD format up to 1999, where YYYY = Year, MM = Month and DD = Day. From 2000 onwards the element captures the time of the accident as well.

 


Access Control
SAS Name: ACCESS

Definition: Access control at the location of the crash.

Additional Information: New element added in 2000.

  • 1 - No Access Control
  • 2 - Full Access Control
  • 3 - Partial Access Control

 


First Harmful Event
SAS Name: ACCTYPE

Definition: First harmful event in the crash sequence.

Additional Information:
1. Some changes in codes for this element from 2000 onwards. This resulted in some shifts in categories. Some categories were combined, while some categories were differentiated because of this.
2. There is a significant decrease in run-off road crashes from 1999-2000. This is because quite a few crashes that were coded as run-off road until 1999 were coded as fixed object crashes from 2000 onwards. Similarly, category 18 (movable object) for 2000 and later years appears to be similar to category 34 (other object) for 1999 and earlier years. Also, categories 28 and 29 (sideswipe crashes) for 1999 and earlier years. Also categories 28 and 29 (sideswipe crashes) for 2000 and later years appear to be similar to category 36 for 1999 and earlier years.

  • 00 - Unknown
  • 01 - Ran Off Road – Right
  • 02 - Ran Off Road – Left
  • 03 - Ran Off Road – Straight
  • 04* - Jackknife
  • 05 - Overturn/Rollover
  • 10** - Hit Moped
  • 13** - Other Non-Collision
  • 14 - Pedestrian
  • 15 - Pedalcyclist
  • 16 - RR Train, Engine
  • 17 - Animal
  • 18** - Movable Object
  • 19 - Fixed Object
  • 20 - Parked Motor Vehicle
  • 21 - Rear End, Slow or Stop
  • 22 - Rear End, Turn
  • 23 - Left Turn, Same Roadway
  • 24 - Left Turn, Different Roadways
  • 25 - Right Turn, Same Roadway
  • 26 - Right Turn, Different Roadways
  • 27 - Head On
  • 28** - Sideswipe, Same Direction
  • 29** - Sideswipe, Opposite Direction
  • 30 - Angle
  • 31 - Backing Up
  • 32** - Other Collision with Vehicle
  • 33* - Other in Road
  • 34* - Hit Other Object
  • 35* - Type Not Stated
  • 36 - Sideswipe

* Categories discontinued from 2000 onwards.
** Categories added from 2000 onwards.

 


Accident Year
SAS Name: ACCYR

Definition: Year when the accident occurred.

Additional Information: Format YYYY where YYYY = Year.  Element discontinued from 2000 onwards.

 


Additional Property Damage
SAS Name: ADD_DAMG

Definition: Additional property damage as a result of the crash.

Additional Information: Element discontinued from 2000 onwards.

  • 0 - No Damage
  • 1-49 - Less than $50
  • 50-99 - $50-99
  • 100-149 - $100-149
  • 150-199 - $150-199
  • 200-249 - $220-249
  • 250-299 - $250-299
  • 300-349 - $300-349
  • 350-399 - $350-399
  • 400-449 - $400-449
  • 450-499 - $450-499
  • 500-599 - $500-599
  • 600-699 - $600-699
  • 700-799 - $700-799
  • 800-899 - $800-899
  • 900-999 - $900-999
  • 1000-1499 - $1000-1499
  • 1500-1999 - $1500-1999
  • 2000-2499 - $2000-2499
  • 2500-2999 - $2500-2999
  • 3000-3999 - $3000-3999
  • 4000-4999 - $4000-4999
  • 5000-9999 - $5000-9999
  • 10000-HIGH - $10000 or More

 


Investigating Agency
SAS Name: AGENCY

Definition: Agency that investigated the crash.

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Not Stated
  • ‘1’ - Municipal Police
  • ‘2’ - Sheriff
  • ‘3 - Rural, County Police
  • ‘4’ - Highway Patrol
  • ‘5’ - Other Agency

 


Alcohol/Drugs in Accident
SAS Name: ALCFLAG

Definition: Whether or not alcohol or drugs were involved when the accident occurred.

Additional Information: ‘0’ for Pre 2000. ‘1’ for Pre 2000.

  • ‘N’ - No Drink or Drug
  • ‘Y’ - Intoxication Code 2 or 3

 


Time of Ambulance Request
SAS Name: AMB_TIME

Definition: Time when ambulance was requested to respond to the accident.

Additional Information: Element discontinued from 2000 onwards

 


Ambulance Requested
SAS Name: AMBUL

Definition: Whether or not an ambulance was requested.

Additional Information: Element discontinued from 2000 onwards. 

  • ‘0’,’ ‘ - Not Stated
  • ‘1’ - Ambulance Called
  • ‘2’ - Not Requested

 


Bicycle in Accident
SAS Name: BIKEFLAG

Definition: Bicycle in Accident

Additional Information: ‘0’ for Pre 2000. ‘1’ for Pre 2000.

  • ‘N’ - Not Bicycle Accident
  • ‘Y’ - Bicycle Accident

 


Year and Case Number
SAS Name: CASENO

Definition: Year and Case Number

Additional Information: Format YYNNNNNN where YY = Year and NNNNN = Case Number. Element type is CHAR for 1990 to 1999.

 


City/Town Code (Include CO)
SAS Name: CITY

Definition: City/Town Code (Include CO)

Additional Information: For data before 2010, City/Town Code has to be combined with DIV (i.e. Highway Division Route) variable to get 4-digit City/Town codes. Contact HSIS staff for more information on codes for the city element.  Also note that city element codes are different for pre 2000 and post 2000 years.  HSIS staff maintains a list of all these codes.

 


City Route Number
SAS Name: CNTY_RTE

Definition: City route number where the crash occurred. 

Additional Information: Computed element, used for linkage with the roadlog element.

 


Commercial Vehicle in Accident
SAS Name: COMMFLAG

Definition: Whether or not a commercial vehicle was involved in the accident. 

Additional Information: Element discontinued from 1999 onwards.

  • ‘0’ - Not Commercial Vehicle Accident
  • ‘1’ - Commercial Vehicle Accident

 


NC County Number
SAS Name: COUNTY

Definition: NC county number where the crash occurred.

  • 00 - Alamance
  • 01 - Alexander
  • 02 - Allegheny
  • 03 - Anson
  • 04 - Ashe
  • 05 - Avery
  • 06 - Beaufort
  • 07 - Bertie
  • 08 - Bladen
  • 09 - Brunswick
  • 10 - Buncombe
  • 11 - Burke
  • 12 - Carrabus
  • 13 - Caldwell
  • 14 - Camden
  • 15 - Carteret
  • 16 - Caswell
  • 17 - Catawba
  • 18 - Chatham
  • 19 - Cherokee
  • 20 - Chowan
  • 21 - Clay
  • 22 - Cleveland
  • 23 - Columbus
  • 24 - Craven
  • 25 - Cumberland
  • 26 - Currituck
  • 27 - Dare
  • 28 - Davidson
  • 29 - Davie
  • 30 - Duplin
  • 31 - Durham
  • 32 - Edgecombe
  • 33 - Forsyth
  • 34 - Franklin
  • 35 - Gaston
  • 36 - Gates
  • 37 - Graham
  • 38 - Granville
  • 39 - Greene
  • 40 - Guilford
  • 41 - Halifax
  • 42 - Harnett
  • 43 - Haywood
  • 44 - Henderson
  • 45 - Hertford
  • 46 - Hoke
  • 47 - Hyde
  • 48 - Iredell
  • 49 - Jackson
  • 50 - Johnston
  • 51 - Jones
  • 52 - Lee
  • 53 - Lenoir
  • 54 - Lincoln
  • 55 - Macon
  • 56 - Madison
  • 57 - Martin
  • 58 - McDowell
  • 59 - Mecklenburg
  • 60 - Mitchell
  • 61 - Montgomery
  • 62 - Moore
  • 63 - Nash
  • 64 - New Hanover
  • 65 - Northampton
  • 66 - Onslow
  • 67 - Orange
  • 68 - Pamlico
  • 69 - Pasquotank
  • 70 - Pender
  • 71 - Perquimans
  • 72 - Person
  • 73 - Pitt
  • 74 - Polk
  • 75 - Randolph
  • 76 - Richmond
  • 77 - Robeson
  • 78 - Rockingham
  • 79 - Rowan
  • 80 - Rutherford
  • 81 - Sampson
  • 82 - Scotland
  • 83 - Stanly
  • 84 - Stokes
  • 85 - Surry
  • 86 - Swain
  • 87 - Transylvania
  • 88 - Tyrell
  • 89 - Union
  • 90 - Vance
  • 91 - Wake
  • 92 - Warren
  • 93 - Washington
  • 94 - Watauga
  • 95 - Wayne
  • 96 - Wilkes
  • 97 - Wilson
  • 98 - Yadkin
  • 99 - Yancey

 


Day of the Month
SAS Name: DAY

Definition: Day of the month when the crash occurred.

Additional Information: Format DD where DD = Day of the Month (01-31). Element added in 1998, and discontinued in 2000 onwards. 

 


Reporting Department Code
SAS Name: DEPT_CDE

Definition: Department code of the department who reported to the crash.

Additional Information: New element added in 2000.

 


Development Amount
SAS Name: DEVELOP

Definition: Development Amount

  • 0 - Not Stated
  • 1 - Rural (< 30% Developed)
  • 2 - Mixed (30% to 70%)
  • 3 - Urban (> 70% Developed)

 


From Road
SAS Name: FRM_RD

Definition: From Road - used in describing crash location for subsequent mileposting.

 


From Road Class
SAS Name: FRMRD_CL

Definition: From Road Class - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

  • ‘CL’ - County Line
  • ‘I’ - Interstate
  • ‘LCL’ - Local City Street
  • ‘MILE’ - Mile Marker
  • ‘ML’ - Municipal Limit
  • ‘NC’ - NC Route
  • ‘PP’ - Private Property
  • ‘PVA’ - Public Vehicular Area
  • ‘RP’ - Rural Paved
  • ‘RU’ - Rural Unpaved
  • ‘SL’ - State Line
  • ‘SR’ - State Route
  • ‘UNK’ - Unknown
  • ‘US’ - US Route

 


Direction from Road
SAS Name: FROM_DIR

Definition: Direction from Road - used in describing crash location for subsequent mileposting.

Additional Information: Element discontinued from 2000 onwards.

  • ‘E’ - East
  • ‘N’ - North
  • ‘NE’ - Northeast
  • ‘NW’ - Northwest
  • ‘S’ - South
  • ‘SE’ - Southeast
  • ‘SW’ - Southwest
  • ‘W’ - West
  • ‘00’ - Unknown

 


Hazmat Vehicle in Accident
SAS Name: HAZFLAG

Definition: Hazmat Vehicle in Accident

Additional Information: Element discontinued from 1999 onwards.

  • ‘0’ - No Hazmat Vehicle in Accident
  • ‘1’ - Hazmat Vehicle in Accident

 


Hit and Run Accident
SAS Name: HITRUN

Definition: Whether or not the accident was a hit and run.

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Not Hit and Run Accident
  • ‘1’ - Hit and Run Accident

 


Hour
SAS Name: HOUR

Definition: Hour when the crash occurred.

Additional Information: Element discontinued from 2000 onwards.

  • 00 - 12:00-12:59 AM
  • 01 - 1:00-1:59 AM
  • 02 - 2:00-2:59 AM
  • 03 - 3:00-3:59 AM
  • 04 - 4:00-4:59 AM
  • 05 - 5:00-5:59 AM
  • 06 - 6:00-6:59 AM
  • 07 - 7:00-7:59 AM
  • 08 - 8:00-8:59 AM
  • 09 - 9:00-9:59 AM
  • 10 - 10:00-10:59 AM
  • 11 - 11:00-11:59 AM
  • 12 - 12:00-12:59 PM
  • 13 - 1:00-1:59 PM
  • 14 - 2:00-2:59 PM
  • 15 - 3:00-3:59 AM
  • 16 - 4:00-4:59 AM
  • 17 - 5:00-5:59 AM
  • 18 - 6:00-6:59 AM
  • 19 - 7:00-7:59 AM
  • 20 - 8:00-8:59 AM
  • 21 - 9:00-9:59 AM
  • 22 - 10:00-10:59 Am
  • 23 - 11:00-11:59 AM
  • 24 - Not Stated

 


Light Condition
SAS Name: LIGHT

Definition: Light condition when the accident occurred.

  • 0 - Not Stated (Pre 2000)
  • 1 - Daylight
  • 2 - Dusk
  • 3 - Dawn
  • 4 - Dark – Lighted Roadway
  • 5 - Dark – Roadway Not Lighted
  • 6 - Dark – Unknown Lighting
  • 7 - Other
  • 8 - Unknown

 


Accident Location Type
SAS Name: LOC_TYPE

Definition: Location of the crash in relation to nearby roadway feature.

Additional Information:
1. Some changes in codes for this variable from 2000 onwards. This resulted in some shifts in categories. Some categories were combined, while some categories were differentiated because of this.
2. For 2000 and later years, categories 7 to 12 are coded which describe different types of intersections. Prior to 2000, all intersection related crashes were coded as category 27. Similarly, for 2000 and later years categories 15 to 21 are coded which describe different types of ramp crashes. Prior to 2000, all ramp related crashes were coded as category 28.

  • 00 - No Feature
  • 01 - Bridge
  • 02 - Bridge Approach
  • 03 - Underpass
  • 04 - Driveway, Public
  • 05 - Driveway, Private
  • 06 - Alleyway Intersection
  • 07** - Four-Way Intersection
  • 08** - T-Intersection
  • 09** - Y-Intersection
  • 10** - Traffic Circle/Roundabout
  • 11** - Five Point or More
  • 12** - Related to Intersection
  • 13 - Non-Intersection Median Crossing
  • 14 - End or Beginning Divided Highway
  • 15** - Off Ramp Entry
  • 16** - Off Ramp Proper
  • 17** - Off Ramp Terminal on Crossroad
  • 18** - Merge Lane Between On and Off Ramp
  • 19** - On Ramp Entry
  • 20** - On Ramp Proper
  • 21** - On Ramp Terminal on Crossroad
  • 22 - Railroad Crossing
  • 23 - Tunnel
  • 24 - Shared Use Path or Trails
  • 25 - Other
  • 26* - Not stated (Pre 2000)
  • 27* - Intersection of Roadway (Pre 2000)
  • 28* - Interchange Ramp (Pre 2000)
  • 29* - Interchange Service Road (Pre 2000)

* Categories coded before 2000.
** Categories coded after 2000.

 


Development Type
SAS Name: LOCALITY

Definition: Type of development at crash location.

  • 0 - Not Stated
  • 1 - Farms, Woods, Pastures
  • 2 - Residential
  • 3 - Commercial
  • 4 - Institutional
  • 5 - Industrial
  • 6 - Unknown

 


Motorcycle in Accident
SAS Name: MCFLAG

Definition: Whether or not a motorcycle was involved in the accident.

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Not Motorcycle Accident
  • ‘1’ - Motorcycle Accident

 


Means of Involvement
SAS Name: MEANS

Definition: Means of Involvement

Additional Information: Element discontinued from 2000 onwards.

  • ‘1’ - Ran Off Road
  • ‘2’ - Hit Fixed Object
  • ‘3’ - Hit Non-Fixed Object
  • ‘4’ - Car vs Car
  • ‘5’ - Car vs Truck or Bus
  • ‘6’ - More Than 2 Vehicles Involved
  • ‘7’ - Other 1 or 2 Vehicle Accident

 


Most Harmful Event
SAS Name: MHARM AC

Definition: Most harmful event in the crash sequence.

Additional Information: New element added in 2000.

  • 00 - Unknown
  • 01 - Ran Off Road – Right
  • 02 - Ran Off Road – Left
  • 03 - Ran Off Road – Straight
  • 04 - Jackknife
  • 05 - Overturn/Rollover
  • 13 - Other Non-Collision
  • 14 - Pedestrian
  • 15 - Pedalcycle
  • 16 - RR Train, Engine
  • 17 - Animal
  • 18 - Movable Object
  • 19 - Fixed Object
  • 20 - Parked Motor Vehicle
  • 21 - Rear End, Slow or Stop
  • 22 - Rear End, Turn
  • 23 - Left Turn, Same Roadway
  • 24 - Left Turn, Different Roadway
  • 25 - Right Turn, Same Roadway
  • 26 - Right Turn, Different Roadway
  • 27 - Head On
  • 28 - Sideswipe, Same Direction
  • 29 - Sideswipe, Opposite Direction
  • 30 - Angle
  • 31 - Backing Up
  • 32 - Other Collision with Vehicle

 


Milepost
SAS Name: MILEPOST

Definition: Milepost

 


Month of Accident
SAS Name: MONTH

Definition: Month of the year when the accident occurred.

Additional Information: Element discontinued from 2000 onwards.

  • ‘1’ - January
  • ‘2’ - February
  • ‘3’ - March
  • ‘4’ - April
  • ‘5’ - May
  • ‘6’ - June
  • ‘7’ - July
  • ‘8’ - August
  • ‘9’ - September
  • ‘10’ - October
  • ‘11’ - November
  • ‘12’ - December

 


Moped in Accident
SAS Name: MOPEDFLG

Definition: Whether or not a moped was involved in the accident.

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Not Moped Accident
  • ‘1’ - Moped Accident

 


Direction from Municipality to Accident
SAS Name: MUNI_DIR

Definition: Direction from municipality to accident - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

  • ‘E’ - East
  • ‘N’ - North
  • ‘NE’ - Northeast
  • ‘NW’ - Northwest
  • ‘S’ - South
  • ‘SE’ - Southeast
  • ‘SW’ - Southwest
  • ‘W’ - West

 


Distance from Municipality in Miles
SAS Name: MUNI_DIS

Definition: Distance from the municipality to the crash in miles - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000

 


Million Vehicle Miles Traveled
SAS Name: MVMT

Definition: Million Vehicle Miles Traveled

Additional Information: Million Vehicle Miles Traveled on Road Segment.  Element discontinued from 2000 onwards.

 


Number of Lanes (Crash Report)
SAS Name: NBR_LANE

Definition: Number of lanes at the crash location.

  • 00 - Parking Lot
  • 01 - 1 Lane
  • 02 - 2 Lanes
  • 03 - 3 Lanes
  • 04 - 4 Lanes
  • 05 - 5 Lanes
  • 06 - 6 Lanes
  • 07 - 7 Lanes
  • 08 - 8 Lanes
  • 09 - 9 Lanes
  • 10 - 10 Lanes
  • 11 - 11 Lanes
  • 12 - 12 Lanes
  • 13-99 - > 12 Lanes

 


In or Near Town
SAS Name: NEARTOWN

Definition: In or Near Town - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

  • 1 - Yes
  • 2 - No

 


Non-Reportable
SAS Name: NON_REP

Definition: Whether a crash does not meet the minimum reportability requirement.

Additional Information: New element added in 2000.

  • 1 - Yes
  • 2 - No

 


Non-Motorist Count
SAS Name: NONMTCNT

Definition: Non-Motorist Count

Additional Information: New element added in 2000.

 


Number of Vehicle + Pedestrian + Bike
SAS Name: NUM_UNIT

Definition: Number of Vehicle + Pedestrian + Bike

 


Number of Units
SAS Name: NUMVEHS

Definition: Number of units involved in the crash.

 


Reporting Officer State
SAS Name: OFFCR_ST

Definition: Reporting Officer State

Additional Information: New element added in 2000.

 


On Road
SAS Name: ON_RD

Definition: On Road - used in describing crash location for subsequent mileposting.

 


On Road Class
SAS Name: ONRD_CL

Definition: On Road Class - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

  • ‘CL’ - County Line
  • ‘I’ - Interstate
  • ‘LCL’ - Local City Street
  • ‘MILE’ - Mile Marker
  • ‘ML’ - Municipal Limit
  • ‘NC’ - NC Route
  • ‘PP’ - Private Property
  • ‘PVA’ - Public Vehicular Area
  • ‘RP’ - Rural Paved
  • ‘RU’ - Rural Unpaved
  • ‘SL’ - State Line
  • ‘SR’ - State Route
  • ‘UNK’ - Unknown
  • ‘US’ - US Route

 


Patrol Area Code
SAS Name: PATROLAC

Definition: Patrol Area for NC State Highway Patrol.

Additional Information: New element added in 2000.

 


Pedestrian in Accident
SAS Name: PEDFLAG

Definition: Whether or not the accident involved pedestrians.

  • ‘N’ - Not Pedestrian Accident (‘0’ for Pre 2000)
  • ‘Y’ - Pedestrian Accident (‘1’ for Pre 2000)

 


Quality of Milepost
SAS Name: PLOTQUAL

Definition: Quality of Milepost

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Blank
  • ‘1’ - Good Location
  • ‘2’ - Loop, Ok Direction
  • ‘3’ - Bad Direction
  • ‘4’ - Loop, Bad Direction
  • ‘5’ - Located on Yline
  • ‘6’ - Adjust to RT End
  • ‘7’ - Private Property
  • ‘8’ - Cannot Milepost
  • ‘9’ - Route is Invalid

 


City Population
SAS Name: POP_GRP

Definition: Population of city where crash occurred.

Additional Information: The unit of this element is thousands for years before 1999. So, if the variable is coded as 10, it indicates 10,000. For later years, the variable is coded as the absolute population, which are 10,000 indicates 10,000.

  • 0 - < 1000 – Rural
  • 1-4 - 1000-1499
  • 5-9 - 5000-9999
  • 10-19 - 10000-19999
  • 20-34 - 20000-34999
  • 35-49 - 35000-49999
  • 50-74 - 50000-74999
  • 75-99 - 75000-99999
  • 100-HIGH - 100000 +

 


Total Property Damage
SAS Name: PROPDAM

Definition: Total property damage in dollars as a result of the crash.

  • 0 - No Damage
  • 1-49 - Less than $50
  • 50-99 - $50-99
  • 100-149 - $100-149
  • 150-199 - $150-199
  • 200-249 - $220-249
  • 250-299 - $250-299
  • 300-349 - $300-349
  • 350-399 - $350-399
  • 400-449 - $400-449
  • 450-499 - $450-499
  • 500-599 - $500-599
  • 600-699 - $600-699
  • 700-799 - $700-799
  • 800-899 - $800-899
  • 900-999 - $900-999
  • 1000-1499 - $1000-1499
  • 1500-1999 - $1500-1999
  • 2000-2499 - $2000-2499
  • 2500-2999 - $2500-2999
  • 3000-3999 - $3000-3999
  • 4000-4999 - $4000-4999
  • 5000-9999 - $5000-9999
  • 10000-HIGH - $10000 or More

 


Public Vehicular Area
SAS Name: PVA

Definition: Public Vehicular Area

Additional Information: Element discontinued from 2000 onwards.

 


Road Character
SAS Name: RD_CHAR1

Definition: Character of the road where the crash occurred.

  • 00 - Not Stated
  • 01 - Straight – Level
  • 02 - Straight – Hillcrest
  • 03 - Straight – Grade
  • 04 - Straight – Bottom
  • 05 - Curve – Level
  • 06 - Curve – Hillcrest
  • 07 - Curve – Grade
  • 08 - Curve – Bottom
  • 09 - Other
  • 10 - Unknown

Road Configuration
SAS Name: RD_CONF

Definition: Road configuration where the crash occurred.

Additional Information: All divided highways coded as category 6 for 1999 and earlier years. For 2000 and later years, all divided highways coded as category 3 and category 4. 

  • 0 - Not Stated
  • 1 - One-Way, Not Divided
  • 2 - Two-Way, Not Divided
  • 3** - Two-Way, Divided, Unprotected Median
  • 4** - Two-Way, Divided, Positive Median Barrier
  • 5 - Unknown
  • 6* - Divided

* Categories present in 1999 and earlier years.
** Categories present in 2000 and later years.

 


Type of Road Surface (Rep)
SAS Name: RD_PAVE

Definition: Road surface type where the crash occurred.

Additional Information: Element discontinued from 2000 onwards.

  • ' ' - Uncoded
  • 0 - Not Stated
  • 1 - Concrete
  • 2 - Grooved Concrete
  • 3 - Smooth Asphalt
  • 4 - Coarse Asphalt
  • 5 - Gravel
  • 6 - Sand
  • 7 - Soil
  • 8 - Other

 


Surface Condition
SAS Name: RDSURF

Definition: The condition of the road surface where the crash occurred.

  • 00 - Not Stated
  • 01 - Dry
  • 02 - Wet
  • 03* - Water (Standing, Moving)
  • 04 - Ice
  • 05 - Snow
  • 06* - Slush
  • 07 - Sand, Mud, Dirt, Gravel
  • 08 - Fuel, Oil
  • 09 - Other
  • 10 - Unknown

*Categories present in 2000 and later years.

 


Distance from FRM_RD in Feet
SAS Name: REFDISFT

Definition: Distance from FRM_RD in feet - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

 


Distance from FRM_RD in Miles
SAS Name: REFDISMI

Definition: Distance from FRM_RD in miles - used in describing crash location for subsequent mileposting.

 


Relation to Roadway
SAS Name: REL_RD

Definition: Location of crash relative to travel lanes.

Additional Information: New element in added in 2000.

  • 1 - On roadway
  • 2 - Shoulder
  • 3 - Median
  • 4 - Roadside
  • 5 - Outside trafficway
  • 6 - Unknown

 


Reportable Status
SAS Name: REPORT

Definition: Reportable Status

  • ‘D’ - Property Damage Only
  • ‘F’ - Fatal
  • ‘I’ - Injury
  • ‘N’ - Non-Reportable
  • ‘P’* - Private Property
  • ‘X’* - PVA Property Damage
  • ‘Y’* - PVA Injury
  • ‘Z’* - PVA Fatal
  • ‘ ‘ - Unknown

* Categories present in 2000 and later years.

 


Ramp or Service Road
SAS Name: RMP_SVRD

Definition: Crash ocurred on a ramp or service road.

Additional Information: New element added in 2000.

  • Blank - Uncoded
  • 1 - Yes

 


Road Classification
SAS Name: ROAD_CLS

Definition: Classification of the roadway where the crash occurred.

Additional Information: New element added in 2000.

  • 1 - Interstate
  • 2 - US Route
  • 3 - NC Route
  • 4 - State Secondary Route
  • 5 - Local Street
  • 6 - Public Vehicular Area
  • 7 - Private Road, Driveway
  • 8 - Other

 


Roadway Contributing Circumstance 1
SAS Name: ROADCONT1
Roadway Contributing Circumstance 2
SAS Name: ROADCONT2

Definition: Roadway circumstance/condition that contributed to the crash.

  • 00 - None
  • 01 - Road Surface Condition
  • 02 - Debris
  • 03 - Rut, Holes, Bumps
  • 04 - Work Zone
  • 05 - Worn Travel-Polished Surface
  • 06 - Obstruction in Roadway
  • 07 - Traffic Control Device Inoperative, Not Visible or Uncoded
  • 08 - Shoulders Low, Soft or High
  • 09 - No Shoulders
  • 10 - Non-Highway Work
  • 11 - Other
  • 12 - Unknown
  • 13 - Repairs, Defects (Pre 2000)
  • 14 - No Defects (Pre 2000)

 


Roadway Class
SAS Name: RODWYCLS

Definition: Roadway Class

Additional Information: Element discontinued from 2000 onwards.

  • ‘01’ - Urban Freeways
  • ‘02’ - Urban Freeways Less than 4 Lanes
  • ‘03’ - Urban 2 Lane Roads
  • ‘04’ - Urban Multilane Divided Non-Freeway
  • ‘05’ - Urban Multilane Undivided Non-Freeway
  • ‘06’ - Rural Freeways
  • ‘07’ - Rural Freeways Less than 4 Lanes
  • ‘08’ - Rural 2-Lane Roads
  • ‘09’ - Rural Multilane Divided Non-Freeway
  • ‘10’ - Rural Multilane Undivided Non-Freeway
  • ‘99’ - Others

 


Railroad Crossing Number
SAS Name: RRX_NUM

Definition: Railroad Crossing Number

Additional Information: New element added in 2000. 

 


Railroad Cross Not Indicated
SAS Name: RRXFLAG

Definition: Railroad Cross Not Indicated

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ‘ - Blank
  • ‘0’ - Not at Railroad Crossing
  • ‘1’ - At Railroad Crossing

 


Mileposted Route
SAS Name: RTE_NBR

Definition: Mileposted Route

 


Rural-Urban Identification
SAS Name: RURURB

Definition: Rural-Urban Identification

Additional Information: New element added in 2000.

  • ‘R’ - Rural
  • ‘U’ - Urban

 


School Bus Involved In
SAS Name: SCHBUS

Definition: Whether or not a school bus was involved in the crash.

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Not School Bus Accident
  • ‘1’ - School/Activity Bus Accident

 


Worst Injury in Accident
SAS Name: SEVERITY

Definition: The most severe injury in the crash.

  • ‘1’ - Fatal Injury
  • ‘2’ - Class A Injury
  • ‘3’ - Class B Injury
  • ‘4’ - Class C Injury
  • ‘5’ - No Injury
  • ‘6’ - Unknown

 


Computed Speed
SAS Name: SPD_GRP

Definition: Computed speed of vehicles involved in accident.

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Blank
  • ‘0’ - Not Stated
  • ‘1’ - 0-29 MPH
  • ‘2’ - 39-49 MPH
  • ‘3’ - 50+ MPH

 


Citation Issued to Someone in Accident
SAS Name: TICKET1

Definition: Whether a citation was issued to someone in accident.

Additional Information: Element discontinued from 2000 onwards. Almost 100% observations are coded as 0. Use this element with caution. 

  • ‘ ‘ - Blank
  • ‘0’ - No Citation Number in Accident
  • ‘1’ - Citation Number Given

 


Time of Day (24 Hour)
SAS Name: TIME

Definition: Time of day when the accident occurred.

Additional Information: Element discontinued from 1999 onwards.

  • 0000-0059 - 12:00-12:59 AM
  • 0100-0159 - 1:00-1:59 AM
  • 0200-0259 - 2:00-2:59 AM
  • 0300-0359 - 3:00-3:59 AM
  • 0400-0459 - 4:00-4:59 AM
  • 0500-0559 - 5:00-5:59 AM
  • 0600-0659 - 6:00-6:59 AM
  • 0700-0759 - 7:00-7:59 AM
  • 0800-0859 - 8:00-8:59 AM
  • 0900-0959 - 9:00-9:59 AM
  • 1000-1059 - 10:00-10:59 AM
  • 1100-1159 - 11:00-11:59 AM
  • 1200-1259 - 12:00-12:59 PM
  • 1300-1359 - 1:00-1:59 PM
  • 1400-1459 - 2:00-2:59 PM
  • 1500-1559 - 3:00-3:59 PM
  • 1600-1659 - 4:00-4:59 PM
  • 1700-1759 - 5:00-5:59 PM
  • 1800-1859 - 6:00-6:59 PM
  • 1900-1959 - 7:00-7:59 PM
  • 2000-2059 - 8:00-8:59 PM
  • 2100-2159 - 9:00-9:59 PM
  • 2200-2259 - 10:00-10:59 PM
  • 2300-2359 - 11:00-11:59 PM
  • 2460 - Not Stated

 


Direction toward TO_RD
SAS Name: TO_DIR

Definition: Direction toward TO_RD - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

  • ‘E’ - East
  • ‘N’ - North
  • ‘NE’ - Northeast
  • ‘NW’ - Northwest
  • ‘S’ - South
  • ‘SE’ - Southeast
  • ‘SW’ - Southwest
  • ‘W’ - West

 


Toward Road
SAS Name: TO_RD

Definition: Toward Road - used in describing crash location for subsequent mileposting.

 


Toward Road Class
SAS Name: TORD_CL

Definition: Toward Road Class - used in describing crash location for subsequent mileposting.

Additional Information: New element added in 2000.

  • ‘CL’ - County Line
  • ‘I’ - Interstate
  • ‘LCL - Local City Street
  • ‘MILE’ - Mile Marker
  • ‘ML’ - Municipal Limit
  • ‘NC’ - NC Route
  • ‘PP’ - Private Property
  • ‘PVA’ - Public Vehicular Area
  • ‘RP’ - Rural Paved
  • ‘RU’ - Rural Unpaved
  • ‘SL’ - State Line
  • ‘SR’ - State Route
  • ‘UNK’ - Unknown
  • ‘US’ - US Route

 


Total Killed in Accident
SAS Name: TOT_KILL

Definition: Total number killed in accident.

Additional Information: Element discontinued from 2000 onwards.

 


Total A Injures in Accidents
SAS Name: TOTAINJ

Definition: Total A Injures in the accident.

Additional Information: Element discontinued from 2000 onwards.

 


Total B Injures in Accident
SAS Name: TOTBINJ

Definition: Total B Injures in Accident

Additional Information: Element discontinued from 2000 onwards. 

 


Total C Injuries in Accident
SAS Name: TOTCINJ

Definition: Total C Injuries in Accident

Additional Information: Element discontinued from 2000 onwards.

 


DOT Assigned Town Code
SAS Name: TOWN_CD

Definition: DOT Assigned Town Code

Additional Information: New element added in 2000.

 


Traffic Control Type
SAS Name: TRF_CNTL

Definition: Traffic control device present at the crash location.

  • 0 - No Control Present
  • 1 - Stop Sign
  • 2 - Yield Sign
  • 3 - Stop and Go Signal
  • 4 - Flashing Signal with Stop Sign
  • 5 - Flashing Signal without Stop Sign
  • 6 - RR Gate and Flasher
  • 7 - RR Flasher
  • 8 - RR Crossbucks  Only
  • 9 - Human Control
  • 10* - Warning Sign
  • 11* - School Zone Signs
  • 12* - Flashing Stop and Go Signal
  • 13* - Double Yellow Line, No Passing Zone
  • 14 - Other
  • 15 - Not Stated

* Categories present in 2000 and later years.

 


Traffic Control Operating
SAS Name: TRF_OPER

Definition: Whether the traffic control device was operating when the crash occurred.

  • 0 - No
  • 1 - Yes
  • 2 - Unknown
  • 3 - Not Stated (Pre 2000)

 


Traffic Control Visible
SAS Name: TRF_VIS

Definition: Whether or not the traffic control was visible when the crash occurred.

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’ - Not Stated
  • ‘1’ - Visible
  • ‘2’ - Not Visible

 


Weather Condition 1
SAS Name: WEATHER1
Weather Condition 2 (From 2000 Onwards)
SAS Name: WEATHER2

Definition: Weather conditions when the crash occurred.

Additional Information: Element discontinued from 2000 onwards.

  • 0 - Not Stated
  • 1 - Clear
  • 2 - Cloudy
  • 3 - Rain
  • 4 - Snow
  • 5 - Fog, Smog, Smoke
  • 6 - Sleet, Hall, Freezing Rain/Drizzle
  • 7* - Severe Crosswinds
  • 8* - Blowing Sand, Dirt, Snow
  • 9* - Other

* Categories coded in 2000 and later years.

 


Day of Week
SAS Name: WEEKDAY

Definition: Day of the week that the crash occurred.

Additional Information: Element discontinued from 2000 onwards.

  • ‘1’ - Monday
  • ‘2’ - Tuesday
  • ‘3’ - Wednesday
  • ‘4’ - Thursday
  • ‘5’ - Friday
  • ‘6’ - Saturday
  • ‘7’ - Sunday

 


Weather Contributed to Accident
SAS Name: WETHCONT

Definition: Whether or not weather contributed to the accident.

Additional Information: New element added in 2000.

  • 0 - No
  • 1 - Yes
  • 2 - Unknown

 


Work Zone Marked
SAS Name: WORKZONE

Definition: Whether or not the crash was in a marked work zone.

Additional Information: New element added in 2000.

  • 1 - Yes
  • 2 - No

 


Work Zone Activity
SAS Name: WZ_ACT

Definition: Whether or not there was activity in the work zone when the crash occurred.

Additional Information: New element added in 2000.

  • 1 - On Going Activity
  • 2 - No Apparent Activity

 


Work Zone Area
SAS Name: WZ_AREA

Definition: Type of work zone.

Additional Information: New element added in 2000.

  • 1 - Construction Work Area
  • 2 - Maintenance Work Area
  • 3 - Utility Work Area
  • 4 - Intermitten/Moving Work
  • 5 - No

 


Work Zone Crash Location
SAS Name: WZ_LOC

Definition: Part of work zone where crash occurred.

Additional Information: New element added in 2000.

  • 1 - Before Work Area
  • 2 - In Work Area Approach Taper
  • 3 - Adjacent to Actual Work Area

 


Non-Mileposted Crossing Route Location
SAS Name: Y_LINE

Definition: Non-Mileposted Crossing Route Location

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Blank
  • ‘0’ - Normal Milepost
  • ‘1’ - Y-Line Milepost

 


Reporting Office Zip Code
SAS Name: ZIP_ADR

Definition: Zip code of the office who reported to the crash.

Additional Information: New element added in 2000.

 

Vehicle Subfile

SAS VARIABLE NAME DESCRIPTION SAS VARIABLE FILE FORMAT TYPE PAGE NO
ACTION DRIVER CHARGED WITH VIOL Vehicle CHAR (1) 71
AIRBAGS AIR BAGS PRESENT IN VEH Vehicle CHAR (1) 71
AIRDEPL AIRBAGS DEPLOYED DURING CRASH Vehicle CHAR (1) 72
ALC_DRUG ALCOHOL/DRUG IN ACC Vehicle NUM (8) 72
ALCFLAG ALCOHOL FLAG Vehicle CHAR (1) 72
AMTDAMG AMOUNT OF DAMAGE TO VEH Vehicle NUM (8) 73
AXLE_NBR COMMERCIAL CARRIER AXLES Vehicle NUM (8) 73
AXLES NUMBER OF AXLES FOR TRL#1 Vehicle NUM (8) 74
AXLES2 NUMBER OF AXLES FOR TRL#2 Vehicle NUM (8) 74
BIKEFLAG BICYCLE FLAG Vehicle CHAR (1) 74
BODY CARGO BODY TYPE Vehicle NUM (8) 74
CASENO NC ACCIDENT NUMBER WITH YR Vehicle NUM (8) 75
CC_CITY COMMERCIAL CARRIER CITY Vehicle CHAR (22) 75
CC_STATE COMMERCIAL CARRIER STATE Vehicle CHAR (2) 75
CC_ZIP COMMERCIAL CARRIER ZIP CODE Vehicle CHAR (9) 75
CCB_CITY COMM CARR BUSINESS CITY Vehicle CHAR (2) 75
CCB_STAT COMM CARR BUSINESS STATE Vehicle NUM (8) 75
CDL_IND CDL INDICATOR Vehicle CHAR (1) 76
CNT_SEAT NUMBER OF SEATS OCCUPIED Vehicle CHAR (1) 76
CONTRIB1 VIOL/CONTRIBUT FACTOR #1 Vehicle NUM (8) 76
CONTRIB2 VIOL/CONTRIBUT FACTOR #2 Vehicle NUM (8) 76
CONTRIB3 VIOL/CONTRIBUT FACTOR #3 Vehicle NUM (8) 76
CONTRIB4 VIOL/CONTRIBUT FACTOR #4 Vehicle NUM (8) 76
CONTRIB5 VIOL/CONTRIBUT FACTOR #5 Vehicle NUM (8) 76
CROSSMED CROSS MEDIAN Vehicle CHAR (1) 77
DAMSEV TAD#1 SEVERITY Vehicle CHAR (1) 78
DAMSEV2 TAD#2 SEVERITY Vehicle CHAR (1) 78
DAMSEV3 TAD#3 SEVERITY Vehicle CHAR (1) 78
DIR_TRVL DIRECT OF TRAVEL ON Vehicle CHAR (2) 78
DRG_RES DRIVER ALC/DRUG TEST RESULT Vehicle CHAR (8) 79
DRG_SUSP DRIVER ALC/DRUG SUSPECTED Vehicle CHAR (8) 79
DRSTATE OUT OF STATE DRIVERS LIC Vehicle CHAR (1) 79
DRV_AGE DRIVER/PEDEST AGE Vehicle CHAR (3) 79
DRV_BAC DRIVER BLOOD ALCOHOL IN % Vehicle NUM (8) 80
DRV_CITY DRIVER CITY Vehicle CHAR (1) 80
DRV_DOB DRIVER DATE OF BIRTH Vehicle NUM (8) 80
DRV_INJ DRIVER/PEDESTRIAN INJURY Vehicle CHAR (1) 81
DRV_LICENSE_RESTRICT DRIVERS LICENSE RESTRICT Vehicle NUM (8) 81
DRV_RACE DRIVER/PEDEST RACE Vehicle CHAR (1) 82
DRV_REST DRIVER RESTRAINT USAGE Vehicle CHAR (2) 82
DRV_SEAT DRIVER/PEDEST SEAT POS Vehicle CHAR (1) 83
DRV_SEX DRIVER/PEDEST SEX Vehicle CHAR (1) 83
DRV_ZIP DRIVER ZIP CODE Vehicle CHAR (9) 83
EMERGUSE EMERGENCY VEHICLE USE Vehicle NUM (8) 83
EVENT1 SEQUENCE OF EVENTS 1 Vehicle NUM (8) 84
EVENT2 SEQUENCE OF EVENTS 2 Vehicle NUM (8) 84
EVENT3 SEQUENCE OF EVENTS 3 Vehicle NUM (8) 84
EVENT4 SEQUENCE OF EVENTS 4 Vehicle NUM (8) 84
EXPR_DT LICENSE EXPIRATION DATE Vehicle NUM (8) 86
FIRE POSTCRASH FIRE Vehicle NUM (8) 86
GOV_OWN GOV OWNED VEH INDICATOR Vehicle CHAR (1) 86
GVWR_WGT COMM CARR GROSS VEH WEIGHT Vehicle NUM (8) 86
HAZ_NUM1 1 DIGIT HAZMAT NUM PLACARD Vehicle NUM (8) 86
HAZ_NUM4 4 DIGIT HAZMAT NUM PLACARD Vehicle CHAR (4) 87
HAZ_PLAC HAZMAT PLACARD INDICATOR Vehicle CHAR (1) 87
HAZMAT HAZARDOUS CARGO Vehicle CHAR (1) 87
IMPACTFT DIST TRAVEL AFTER IMPACT Vehicle NUM (8) 87
IMPACTSP IMPACT SPEED Vehicle NUM (8) 88
INSURED INSURANCE INDICATOR Vehicle CHAR (1) 89
INTOXC DRIVER INTOXICATION GROUP Vehicle NUM (8) 89
L_PERMIT LEARNER PERMIT Vehicle CHAR (1) 89
LENGTRL LENGTH OF TRAILER #1,IN FT Vehicle NUM (8) 89
LENGTRL2 LENGTH OF TRAILER #2,IN FT Vehicle NUM (8) 89
LIC_IND DRIVER LICENSE INDICATOR Vehicle CHAR (1) 90
LIC_STAT LICENSE STATE Vehicle CHAR (2) 90
LICRESTR RESTRICT ON DRIV LICENSE Vehicle CHAR (2) 90
LICTYPE TYPE OF DRIVERS LICENSE Vehicle CHAR (1) 91
MAKE VEHICLE MAKE Vehicle CHAR (2) 91
MAKENAME VEHICLE MAKE NAME Vehicle CHAR (20) 91
MANEUVER VEH MANEUVER/PEDEST ACTION Vehicle NUM (8) 92
MISCACT1 MISCELLANEOUS ACTION Vehicle CHAR (2) 93
MOSTHARM MOST HARMFUL EVENT Vehicle NUM (8) 94
NUM_A TOTAL A INJURIES IN VEH Vehicle CHAR (2) 96
NUM_B TOTAL B INJURIES IN VEH Vehicle CHAR (2) 96
NUM_C TOTAL C INJURIES IN VEH Vehicle CHAR (2) 96
NUM_K TOTAL KILLED IN VEHICLE Vehicle CHAR (2) 96
NUM_OCCS TOTAL OCCUPANTS IN VEH Vehicle CHAR (2) 96
NUM_POCS NO OF POINTS OF CONTACT Vehicle CHAR (1) 96
NUM_TADS NUMBER OF TAD CODES Vehicle CHAR (1) 96
NUMINJ TOT INJURED IN VEH (K+A+B+C) Vehicle CHAR (2) 96
NUMVIOLS NUM OF VIOLS INDICATED Vehicle CHAR (1) 97
OBJECT1 TYPE OF OBJECT STRUCK Vehicle CHAR (2) 97
ON_RD ON ROAD Vehicle CHAR (8) 98
ONRD_CL ON ROAD CLASS Vehicle CHAR (4) 99
OTH_UNIT OTHER UNIT TYPE Vehicle CHAR (20) 99
OUTSTATE OUT OF STATE VEH REGIS Vehicle CHAR (1) 99
OWN_CITY VEHICLE OWNER CITY Vehicle CHAR (22) 99
OWN_STAT VEHICLE OWNER STATE Vehicle CHAR (2) 100
OWN_ZIP VEHICLE OWNER ZIP CODE Vehicle CHAR (9) 100
OWNERTYP OWNER CATEGORY Vehicle CHAR (3) 100
PARK_VEH INDICATOR OF PARKED VEH Vehicle CHAR (1) 100
PED_LOC NON-MOTORIST LOCATION Vehicle NUM (8) 101
PEDACT NON-MOTORIST ACTION Vehicle NUM (8) 102
PEDCONT1 CONTRIB CIRCUM NON-MOT 1 Vehicle NUM (8) 103
PEDCONT2 CONTRIB CIRCUM NON-MOT 2 Vehicle NUM (8) 103
PEDFLAG PEDESTRIAN IN ACCIDENT Vehicle CHAR (1) 103
PEDHITBY PUPIL PEDEST STRUCK BY (SCHLBUS CRASH) Vehicle CHAR (1) 104
PHYSCOND PHYSICAL COND OF DRIVER Vehicle NUM (8) 104
PTCONT1 POINT OF CONTACT #1 Vehicle CHAR (2) 105
PTCONT2 POINT OF CONTACT #2 Vehicle CHAR (2) 105
PTCONT3 POINT OF CONTACT #3 Vehicle CHAR (2) 105
PTCONT4 POINT OF CONTACT #4 Vehicle CHAR (2) 105
PTCONT5 POINT OF CONTACT #5 Vehicle CHAR (2) 105
RD2OBJST DISTANCE TO OBJECT STRUCK Vehicle NUM (8) 106
REGION REGION OF IMPACT Vehicle CHAR (1) 107
ROLLOVER VEHICLE ROLLOVER Vehicle CHAR (1) 107
ROLLPTCT ROLLOVER, POINT OF CONTACT Vehicle NUM (8) 107
ROLLTAD ROLLOVER, TAD SEVERITY Vehicle NUM (8) 108
SCH_BUS1 SCHOOL BUS CONTACT VEH Vehicle NUM (8) 108
SCH_BUS2 SCHOOL BUS NON-CONTACT VEH Vehicle NUM (8) 108
SOB_TEST CHEMICAL TEST GIVEN Vehicle NUM (8) 109
SPDLIM POSTED SPEED LIMIT Vehicle NUM (8) 109
SPILL HAZARDOUS CARGO SPILL Vehicle CHAR (1) 110
TIRESKID TIRE IMPRESSIONS IN FEET Vehicle NUM (8) 110
TOTLENG TOT LENGTH OF TRAILER(S) IN FEET Vehicle CHAR (3) 110
TOWAWAY VEHICLE DRIVEABLE Vehicle NUM (8) 111
TOWED_BY TOWED BY Vehicle CHAR (50) 111
TOWED_TO TOWED TO Vehicle CHAR (50) 111
TRL_TYPE TRAILER TYPE Vehicle NUM (8) 111
TRL1_FLG DATA PRESENT (TRAILER #1) Vehicle CHAR (1) 112
TRL2_FLG DATA PRESENT (TRAILER #2) Vehicle CHAR (1) 112
TRVL_SPD ESTIMATED ORIGINAL SPEED Vehicle NUM (8) 112
UNDEROVR VEHICLE UNDERRIDE/OVERRIDE Vehicle NUM (8) 113
UNIT_TYP UNIT TYPE Vehicle CHAR (1) 113
V_DAMAG2 TAD#2 LOCATION Vehicle CHAR (2) 114
V_DAMAG3 TAD#3 LOCATION Vehicle CHAR (2) 114
V_DAMAGE TAD#1 (AREA OF DAMAGE) LOC Vehicle CHAR (2) 114
VEH_SEIZ VEHICLE SEIZURE DWI Vehicle CHAR (1) 114
VEH_DEF VEHICLE DEFECT Vehicle NUM (8) 115
VEHNO VEHICLE POSITION NUMBER Vehicle NUM (8) 115
VEHON VEHICLE LOCATION BASED ON ROAD Vehicle CHAR (1) 115
VEHSEV SEVERITY Vehicle NUM (8) 115
VEHTYPE VEHICLE TYPE Vehicle NUM (8) 116
VEHYR MODEL YEAR OF VEHICLE Vehicle NUM (8) 117
VIN VEHICLE IDENTIFICATION NO Vehicle CHAR (17) 117
VIN_ID VEHICLE IDENTIFICATION NO Vehicle CHAR (25) 117
VISION VISION OBSTRUCTION Vehicle NUM (8) 118
WIDTRL WIDTH OF TRAILER #1 (IN) Vehicle NUM (8) 118
WIDTRL2 WIDTH OF TRAILER #2 (IN) Vehicle NUM (8) 118

Note:

(1) SAS variable names and longer explanatory names are shown above each listing. (See Discussion for information on SAS formats.)
(2) For all SAS-formatted variables below, an extra category labeled as "ERROR CODES" consolidates all values not listed as legitimate codes. This category is printed when variables are listed in tables.
(3) For consistency with other State's files and ease of handling, driver-related variables have been included in this Vehicle Subfile as well as in the Occupant Subfile.

 


Driver Charged with Violation
SAS Name: ACTION

Definition: Whether or not the driver of the vehicle involved in the crash was charged with a violation. 

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’,‘0’ - Not Stated
  • ‘1’ - Charged with Violation
  • ‘2’ - Not Charged

 


Airbags Present in Vehicle
SAS Name: AIRBAGS

Definition: Whether or not airbags were present in the vehicle when the accident occurred.

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Blank
  • ‘0’ - Unknown
  • ‘1’ - Air Bag Present
  • ‘2’ - No Air Bag

 


Airbags Deployed in Crash
SAS Name: AIRDEPL

Definition: Wheter or not the airbag deployed.

Additional Information: Element discontinued from 2000 onwards. There is an increase in the number of observations coded as “Airbags Deployed”. This is because for later years, more vehicles were equipped with air bags. 

  • ‘ ’ - Blank
  • ‘0’ - Unknown
  • ‘1’ - Air Bag Deploy
  • ‘2’ - Not Deployed

 


Alcohol/Drug in Accident
SAS Name: ALC_DRUG

Definition: Whether alcohol or drugs were involved in the accident.

Additional Information: Element discontinued from 2000 onwards.

  • 0 - No
  • 1 - Yes – Alcohol, Impairment Suspected
  • 2 - Yes – Alcohol, No Impairment Suspected
  • 3 - Yes – Other Drugs, Impairment Suspected
  • 4 - Yes – Other Drugs, No Impairment Suspected
  • 5 - Yes – Alcohol and Other Drugs, Impairment Suspected
  • 6 - Yes – Alcohol and Other Drugs, No Impairment Suspected
  • 7 - Unknown
  • 8 - Not State
  • 9 - Drinking – Unable to Determine Impairment

 


Alcohol Flag
SAS Name: ALCFLAG

Definition: Alcohol Flag

Additional Information: New element added in 2000.

  • ‘N’ - No Drink or Drug
  • ‘Y’ - Intoxication Code 2 or 3

 


Amount Damage to Vehicle
SAS Name: AMTDAMG

Definition: Amount of damage to vehicle.

  • 0 - No Damage
  • 1-49 - Less Than $50
  • 50-99 - $50-99
  • 100-149 - $100-149
  • 150-199 - $150-199
  • 200-249 - $200-249
  • 250-299 - $250-299
  • 300-349 - $300-349
  • 350-399 - $350-399
  • 400-449 - $400-449
  • 450-499 - $450-499
  • 500-599 - $500-599
  • 600-699 - $600-699
  • 700-799 - $700-799
  • 800-899 - $800-899
  • 900-999 - $900-999
  • 1000-1499 - $1000-1499
  • 1500-1999 - $1500-1999
  • 2000-2499 - $2000-2499
  • 2500-2999 - $2500-2999
  • 3000-3999 - $3000-3999
  • 4000-4999 - $4000-4999
  • 5000-9999 - $5000-9999
  • 10000-High - $10,000 or More

 


Commercial Carrier Number of Axles
SAS Name: AXLE_NBR

Definition: Commercial carrier total number of axles.

Additional Information: New element added in 2000.

 


Number of Axles for TRL#1
SAS Name: AXLES

Definition: Number of Axles for TRL#1

 


Number of Axles for TRL#2
SAS Name: AXLES2

Definition: Number of Axles for TRL#2

 


Bicycle Flag
SAS Name: BIKEFLAG

Definition: Whether or not the crash involved a bicycle.

Additional Information: New element added in 2000.

  • ‘N’ - Not Bicycle Accident
  • ‘Y’ - Bicycle Accident

 


Cargo Body Type
SAS Name: BODY

Definition: Cargo Body Type

Additional Information: New element added in 1999. We are unsure about the quality of this element for 1999. From 2000 onwards, the variable appears consistent.

  • 01 - Bus (Seats for 16 or More, Including Driver)
  • 02 - Bus (Seats for Less Than 16, Including Driver)
  • 03 - Van/Enclosed Box
  • 04 - Grain/Chips/Gravel Truck
  • 05 - Pole Truck
  • 06 - Cargo Tank
  • 07 - Flatbed
  • 08 - Dump
  • 09 - Concrete Mixer
  • 10 - Auto Transporter
  • 11 - Garbage/Refuse
  • 12 - Log truck
  • 13 - Other

 


NC Accident Number with Year
SAS Name: CASENO

Definition: NC accident number with year for the crash.

Additional Information: Format YYNNNNNN, Where YY = Year, and NNNNNN = CASENUM. Element type is CHAR for 1990 to 1999.

 


Commercial Carrier City
SAS Name: CC_CITY

Definition: Commercial Carrier City

Additional Information: New element added in 2000.

 


Commercial Carrier State
SAS Name: CC_STATE

Definition: Commercial Carrier State

Additional Information: New element added in 2000.

 


Commercial Carrier Zip Code
SAS Name: CC_ZIP

Definition: Commercial Carrier Zip Code

Additional Information: New element added in 2000.

 


Commercial Carrier Business City
SAS Name: CCB_CITY

Definition: Commercial Carrier Business City

Additional Information: New element added in 2000.

 


Commercial Carrier Business State
SAS Name: CCB_STAT

Definition: Commercial Carrier Business State

Additional Information: New element added in 2000.

 


CDL Indicator
SAS Name: CDL_IND

Definition: CDL Indicator

Additional Information: New element added in 2000.

 


Number of Seats
SAS Name: CNT_SEAT

Definition: Number of Seats

Additional Information: Element discontinued from 2000 onwards.

 


Violation/Contributing Factor #1
SAS Name: CONTRIB1
Violation/Contributing Factor #2
SAS Name: CONTRIB2
Violation/Contributing Factor #3
SAS Name: CONTRIB3
Violation/Contributing Factor #4
SAS Name: CONTRIB4
Violation/Contributing Factor #5
SAS Name: CONTRIB5

Definition: Violating/Contributing Factor

Additional Information: Elements CONTRIB4 and CONTRIB5 discontinued from 2000 onwards.

  • 00 - No Contributing Factors
  • 01* - Disregarded Yield Sign
  • 02 - Disregarded Stop Sign
  • 03* - Disregarded Other Traffic Signs
  • 04 - Disregarded Traffic Signals
  • 05* - Disregarded Road Signals
  • 06 - Exceeded Authorized Speed Limit
  • 07 - Exceeded Safe Speed for Conditions
  • 08* - Failure to Reduce Speed
  • 09 - Improper Turn
  • 10 - Right Turn on Red
  • 11 - Crossed Center Line/Going Wrong Way
  • 12 - Improper Lane Change
  • 13 - Use of Improper Lane
  • 14* - Overcorrected/Oversteered
  • 15 - Passed Stopped School Bus
  • 16 - Passed on Hill
  • 17 - Passed on Curve
  • 18 - Other Improper Passing
  • 19 - Failed to Yield Right of Way
  • 20* - Inattention
  • 21 - Improper Backing
  • 22 - Improper Parking
  • 23* - Driver Distracted
  • 24 - Improper or No Signal
  • 25 - Followed Too Closely
  • 26 - Operated Vehicle in Erratic, Reckless, Careless, Negligent or Aggressive Manner
  • 27* - Swerved or Avoided Due to Wind, Slippery Surface, Vehicle, Object, Non-Motorist
  • 28* - Visibility Obstructed
  • 29 - Operated Defective Equipment
  • 30 - Alcohol Use
  • 31 - Drug Use
  • 32 - Other
  • 33 - Unable to Determine
  • 34* - Unknown
  • 35** - Not Stated (Pre 2000)
  • 36** - Minimum Speed Law (Pre 2000)
  • 37** - Safe Movement Violation (Pre 2000)

* Categories coded for 2000 and later years.
** Categories code for 1999 and earlier years.

 


Cross Median
SAS Name: CROSSMED

Definition: Whether the vehicle crossed the median during the crash.

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Blank
  • ‘0’ - Not Stated
  • ‘1’ - Crossed Median
  • ‘2’ - Median Not Crossed

 


TAD#1 Severity
SAS Name: DAMSEV
TAD#2 Severity
SAS Name: DAMSEV2
TAD#3 Severity
SAS Name: DAMSEV3

Definition: Severity of damage to the vehicle (based on the TAD level).

  • ‘0’ - Not Stated
  • ‘1’ - Least Severe Damage #1
  • ‘2’ - Least Severe Damage #2
  • ‘3’ - Least Severe Damage #3
  • ‘4’ - Least Severe Damage #4
  • ‘5’ - Severe Damage #5
  • ‘6’ - More Severe Damage #6
  • ‘7’ - More Severe Damage #7
  • ‘8’ - Invalid

 


Direct Travel on Route
SAS Name: DIR_TRVL

Definition: Direction of travel of the vehicle when the crash occurred. 

Additional Information: Categories coded 1-4 for 1999 and earlier years.  For earlier years of data, 1-4 indicated, North, East, South, and West respectively. 

  • ‘E’, ‘2’ - East
  • ‘N’, ‘1’ - North
  • ‘NE’ - Northeast
  • ‘NW’ - Northwest
  • ‘S’, ‘3’ - South
  • ‘SE’ - Southeast
  • ‘SW’ - Southwest
  • ‘W’, ‘4’ - West

 


Driver Alcohol/Drug Test Result
SAS Name: DRG_RES

Definition: Driver Alcohol/Drug Test Result

Additional Information: New element added in 2000.

  • 0 - Not Stated
  • 1 - No Alcohol or Other Drugs
  • 2 - Alcohol (Present BAC)
  • 3 - Other Drugs Reported
  • 4 - Contaminated Sample/Unusable
  • 5 - Pending
  • 6 - Unknown

 


Driver Alcohol/Drug Suspected
SAS Name: DRG_SUSP

Definition: Driver Alcohol/Drug Suspected

Additional Information: New element added in 2000.

 


Out of State Drivers
SAS Name: DRSTATE

Definition: Whether the driver involved in the crash is out of state or not.

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Unknown
  • ‘0’ - NC Driver License
  • ‘1’ - Out of State Driver

 


Driver/Pedestrian Age
SAS Name: DRV_AGE

Definition: Age of the driver or pedestrian involved in the crash.

  • 00-01 - Infant – 1 yr
  • 02-04 - 02-04 yrs
  • 05-10 - 05-10 yrs
  • 11-14 - 11-14 yrs
  • 15 - 15 yrs
  • 16 - 16 yrs
  • 17 - 17 yrs
  • 18 - 18 yrs
  • 19 - 19 yrs
  • 20 - 20 yrs
  • 21-25 - 21-25 yrs
  • 26-30 - 26-30 yrs
  • 31-35 - 31-35 yrs
  • 36-45 - 36-45 yrs
  • 46-55 - 46-55 yrs
  • 56-65 - 56-65 yrs
  • 66-75 - 66-75 yrs
  • 76-85 - 76-85 yrs
  • 86-97 - 86+ yrs
  • 98 - Not Occupied
  • 99 - Not Stated

 


Driver Blood Alcohol Percentage
SAS Name: DRV_BAC

Definition: Driver Blood Alcohol Percentage

Additional Information: New element added in 2000.

 


Driver City
SAS Name: DRV_CITY

Definition: City where the driver involved in the crash is from.

Additional Information: New element added in 2000.

 


Driver Date of Birth
SAS Name: DRV_DOB

Definition: Date of birth of the driver involved in the crash.

 


Driver/Pedestrian Injury
SAS Name: DRV_INJ

Definition: Driver/Pedestrian Injury

  • ‘ ’ - Blank
  • ‘0’ - Not Stated
  • ‘1’ - Killed
  • ‘2’ - A Type Injury
  • ‘3’ - B Type Injury
  • ‘4’ - C Type Injury
  • ‘5’ - PDO NO Injury
  • ‘6’ - Not Occupied
  • ‘7’ - Uknown

 


Driver License Restrict
SAS Name: DRV_LICENSE_RESTRICT

Definition: Whether or not  there was a restriction noted on the driver’s license.

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Out of State or Unlicensed Driver
  • ‘0’ - No Restriction or No NC License
  • ‘1’ - Corrective Lense
  • ‘2’ - 45 MPH Limit
  • ‘3’ - Daylight Driving Only
  • ‘4’ - Corrective Lenses, and 45 MPH Limit
  • ‘5’ - Corrective Lenses, 45 MPH Limit and Daylight Driving Only
  • ‘6’ - Corrective Lenses, and Daylight Driving Only
  • ‘7’ - 45 MPH Limit, and Daylight Driving Only
  • ‘8’ - No Interstate Driving
  • ‘9’ - Other Restriction

 


Driver/Pedestrian Race
SAS Name: DRV_RACE

Definition: Race of the driver/pedestrian involved in the crash.

  • ‘ ’ - Blank
  • ‘0’ - Not Stated
  • ‘1’ - White
  • ‘2’ - Black
  • ‘3’ - Indian
  • ‘4’ - Other
  • ‘5’ - Not Occupied
  • ‘6’* - Hispanic
  • ‘7’ - Non-White

* Category coded from 2000 onwards.

 


Driver Restraint
SAS Name: DRV_REST

Definition: Type of safety restraint used by the driver.

Additional Information: The data included under this variable is inaccurate, in that regularly conducted field observations of use indicate figures which are at least 10 to 15 percent lower than the values found in the accident file.

  • ‘ ‘ - Blank
  • ‘00’ - Not Stated
  • ‘01’ - None
  • ‘02’ - Lap Belt
  • ‘03’ - Lap and Shoulder Belt
  • ‘04’ - Child Restraint
  • ‘05’ - Unknown
  • ‘06’ - Not Occupied
  • ‘07’ - Xhelmet
  • ‘08’* - Shoulder Belt Only
  • ‘09’* - Reflective Clothing
  • ‘10’* - Lighting
  • ‘11’* - Other
  • ‘12’* - Unable to Determine

* Categories coded from 2000 onwards.

 


Driver/Pedestrian Seat Position
SAS Name: DRV_SEAT

Definition: Driver/Pedestrian Seat Position

  • ‘1’ - Driver
  • ‘2’ - Center Front
  • ‘3’ - Right Front
  • ‘4’ - Left Rear
  • ‘5’ - Center Rear
  • ‘6’ - Right Rear

 


Driver/Pedestrian Sex
SAS Name: DRV_SEX

Definition: Sex of the driver or pedestrian involved in the crash. 

  • ‘ ‘ - Blank
  • ‘0’ - Not Stated
  • ‘1’ - Male
  • ‘2’ - Female
  • ‘3’ - Not Occupied
  • ‘4’ - Unknown

 


Driver Zip Code
SAS Name: DRV_ZIP

Definition: Zip code of the driver who was involved in the crash.

Additional Information: New element added in 2000.

 


Emergency Vehicle Use
SAS Name: EMERGUSE

Definition: Emergency Vehicle Use

Additional Information: New element added in 2000.

  • 1 - Firetruck
  • 2 - Ambulance
  • 3 - Military
  • 4 - Police
  • 5 - Other

 


Sequence of Events 1
SAS Name: EVENT1
Sequence of Events 2
SAS Name: EVENT2
Sequence of Events 3
SAS Name: EVENT3
Sequence of Events 4
SAS Name: EVENT4

Definition: Description of each event in the crash sequence for this vehicle.

Additional Information: New element added in 2000.

  • 00 - Unknown
  • 01 - Ran off Road Right
  • 02 - Ran Off Road Left
  • 03 - Ran Off Road Straight Ahead
  • 04 - Jackknife
  • 05 - Overturn/Rollover
  • 06 - Crossed Centerline/Median
  • 07 - Downhill Runaway
  • 08 - Cargo/Equipment Loss or Shift
  • 09 - Fire/Explosion
  • 10 - Immersion
  • 11 - Equipment Failure
  • 12 - Separation of Units
  • 13 - Other Non-Collision
  • 14 - Pedestrian
  • 15 - Pedalcyclist
  • 16 - RR Train, Engine
  • 17 - Animal
  • 18 - Movable Object
  • 20 - Parked Motor Vehicle
  • 21 - Rear End, Slow or Stop
  • 22 - Rear End, Turn
  • 23 - Left Turn, Same Roadways
  • 24 - Left Turn, Different Roadways
  • 25 - Right Turn, Same Roadways
  • 26 - Right Turn, Different Roadways
  • 27 - Head On
  • 28 - Sideswipe, Same Direction
  • 29 - Sideswipe, Opposite Direction
  • 30 - Angle
  • 31 - Backing Up
  • 32 - Other Collision with Vehicle
  • 33 - Tree
  • 34 - Military Route
  • 35 - Luminaire Pole Non-Breakaway
  • 36 - Luminaire Pole Breakaway
  • 37 - Official Highway Sign Non-Breakaway
  • 38 - Official Highway Sign Breakaway
  • 39 - Overhead Sign Support
  • 40 - Commercial Sign
  • 41 - Guardrail End on Shoulder
  • 42 - Guardrail Face on Shoulder
  • 43 - Guardrail End on Median
  • 44 - Guardrail Face on Median
  • 45 - Shoulder Barrier End
  • 46 - Shoulder Barrier Face
  • 47 - Median Barrier End
  • 48 - Median Barrier Face
  • 49 - Bridge Rail End
  • 50 - Bridge Rail Face
  • 51 - Overhead Part Underpass
  • 52 - Pier on Shoulder of Underpass
  • 53 - Pier in Median of Underpass
  • 54 - Abutment of Underpass
  • 55 - Traffic Island Curb or Median
  • 56 - Catch Basin or Culvert on Shoulder
  • 57 - Catch Basin or Culvert on Median
  • 58 - Ditch
  • 59 - Embankment
  • 60 - Mailbox
  • 61 - Fence or Fence Post
  • 62 - Construction Barrier
  • 63 - Crash Cushion
  • 64 - Other Fixed Object

 


License Expiration Date
SAS Name: EXPR_DT

Definition: Expiration date of license of the driver involved in the crash.

Additional Information: New element added in 2000.

 


Post –Crash Fire
SAS Name: FIRE

Definition: Whether or not the crash resulted in a fire.

Additional Information: From 2000 onwards almost 100% observations are coded as missing.

  • ‘1’ - Yes
  • ‘2’ - Unknown
  • ‘3’ - Not Stated

 


Government Owned Vehicle Indicator
SAS Name: GOV_OWN

Definition: Government Owned Vehicle Indicator

Additional Information: New element added in 2000.

  • ‘ ‘ - Uncoded
  • ‘Y’ - Yes
  • ‘N’ - No

 


Commercial Carrier Gross Vehicle Weight
SAS Name: GVWR_WGT

Definition: Commercial Carrier Gross Vehicle Weight

Additional Information: New element added in 2000.

 


1 Digit Hazmat Number Bottom Placard
SAS Name: HAZ_NUM1

Definition: 1 Digit Hazmat Number Bottom Placard

Additional Information: New element added in 2000.

 


4 Digit Hazmat Number Bottom Placard
SAS Name: HAZ_NUM4

Definition: 4 Digit Hazmat Number Bottom Placard

Additional Information: New element added in 2000.

 


Hazmat Placard Indicator
SAS Name: HAZ_PLAC

Definition: Hazmat Placard Indicator

Additional Information: New element added in 2000.

  • ‘1’ - Present
  • ‘ ‘ - Not Present

 


Hazardous Cargo
SAS Name: HAZMAT

Definition: Whether or not the vehicle was carrying hazardous material when the crash occurred.

Additional Information: From 2000 onwards, almost all observations coded as missing.

  • ‘ ’ - Blank
  • ‘0’ - Unknown
  • ‘1’ - Hazardous Material
  • ‘2’ - No Hazardous Material

 


Distance Travel After Impact
SAS Name: IMPACTFT

Definition: Distance traveled by the vehicle after the impact occurred.

  • 000 - 0 Feet
  • 01-05 - 01-05 ft
  • 06-10 - 06-10 ft
  • 11-15 - 11-15 ft
  • 16-20 - 16-20 ft
  • 21-40 - 21-40 ft
  • 41-60 - 41-60 ft
  • 61-80 - 61-80 ft
  • 81-100 - 81-100 ft
  • 101-120 - 101-120 ft
  • 121-140 - 121-140 ft
  • 141-160 - 141-160 ft
  • 161-180 - 161-180 ft
  • 181-200 - 181-200 ft
  • 201-510 - Over 200 ft
  • 511 - Distance N.S.

 


Impact Speed
SAS Name: IMPACTSP

Definition: Estimated speed of the vehicle when impact occurred.

  • 00 - Not Moving
  • 01-05 - 01-05 MPH
  • 06-10 - 06-10 MPH
  • 11-15 - 11-15 MPH
  • 16-20 - 16-20 MPH
  • 21-25 - 21-25 MPH
  • 26-30 - 26-30 MPH
  • 31-35 - 31-35 MPG
  • 36-40 - 36-40 MPH
  • 41-45 - 41-45 MPH
  • 46-50 - 46-50 MPH
  • 51-55 - 51-55 MPH
  • 56-60 - 56-60 MPH
  • 61-65 - 61-65 MPH
  • 66-70 - 66-70 MPH
  • 71-75 - 71-75 MPH
  • 76-80 - 76-80 MPH
  • 81-85 - 81-85 MPH
  • 86-HIGH - Over 85 MPH

 


Insurance Indicator
SAS Name: INSURED

Definition: Whether or not this vehicle was insured.

Additional Information: New element added in 2000.

  • ‘ ‘, ‘0’ - Unknown
  • ‘1’ - Yes
  • ‘2’ - No

 


Driver Intoxication Group
SAS Name: INTOXC

Definition: Driver Intoxication Group

Additional Information: Element added in 1996, and discontinued from 1998 onwards.

  • 1 - Drinking
  • 2 - Not Drinking
  • 3 - Unknown

 


Learner Permit
SAS Name: L_PERMIT

Definition: Learner Permit

Additional Information: Element discontinued from 2000 onwards.

  • ‘0’, ‘ ‘ - No or Not Stated
  • ‘1’ - Learner’s Permit
  • ‘2’ - Limited Permit

 


Length of Trailer #1 in Feet
SAS Name: LENGTRL

Definition: Length of Trailer #1 in Feet

 


Length of Trailer #2 in Feet
SAS Name: LENGTRL2

Definition: Length of Trailer #2 in Feet

 


Driver License Indicator
SAS Name: LIC_IND

Definition: Whether or not the driver had a driver’s license.

Additional Information: New element added in 2000.

  • ‘N’ - No
  • ‘Y’ - Yes

 


License State
SAS Name: LIC_STAT

Definition: State of the license of the driver involved in the crash.

Additional Information: New element added in 2000.

 


Restrict on Driver License
SAS Name: LICRESTR

Definition: Restrict on Driver License

Additional Information: Element discontinued from 2000 onwards.  For years 1995 and 1996, all categories coded as missing. 

  • ‘-‘ - Out of State or Unlicensed Driver
  • ‘0’ - NO Restriction or No NC License
  • ‘1’ - Corrective Lenses
  • ‘2’ - 45 MPH Limit
  • ‘3’ - Daylight Driving Only
  • ‘4’ - Corrective Lenses, and 45 MPH Limit
  • ‘5’ - Corrective Lenses, 45 MPH Limit, Daylight Driving Only
  • ‘6’ - Corrective Lenses, and Daylight Driving Only
  • ‘7’ - 45 MPH Limit, and Daylight Driving Only
  • ‘8’ - No Interstate Driving
  • ‘9’ - Other Restriction

 


Type of Driver License
SAS Name: LICTYPE

Definition: Type of driver license held by the driver of the vehicle involved in the crash.

Additional Information: From 2000 onwards all observations are coded as missing. For 1995 and 1996, all observations coded as 0.

  • ‘0’ - Hit and Run
  • ‘1’ - Class A – NC Operator’s License
  • ‘2’ - Class B – NC Chauffer’s License
  • ‘3’ - Class C – NC Chauffer and Operator’s License
  • ‘4’ - NC Control Number
  • ‘5’ - New Control Number
  • ‘8’ - Learner’s Permit
  • ‘9’ - Limited Permit
  • ‘A’ - Any combination of vehicle with a gross vehicle weight rating, GVWR, of 26,0001 pounds and <= 10,000 pounds
  • ‘B’ - Any single vehicle with a GVWR of 26,0001 pounds not in excess of 10,000 pounds
  • ‘C’ - Any vehicle not described in Class A or B above
  • ‘H’ - Authorizes you to drive a vehicle transporting hazardous materials (hazmat)
  • ‘T’ - Authorizes you to drive double trailers
  • ‘P’ - Authorizes you to drive passenger vehicles
  • ‘L’ - Restricts you to driving vehicles not equipped with air brakes
  • ‘S’ - Restricts you to operating school buses only
  • ‘N’ - Authorizes you to drive tank vehicles
  • ‘X’ - Is a combination of the hazmat and tank vehicle endorsements
  • ‘M’ - Authorizes you to drive a motorcycle

 


Vehicle Make
SAS Name: MAKE

Definition: Make of the vehicle involved in the crash.

Additional Information: Element added in 1999, and discontinued from 2000 onwards. 

 


Vehicle Make Name
SAS Name: MAKENAME

Definition: Vehicle Make Name

 


Vehicle Maneuver/Pedestrian Action
SAS Name: MANEUVER

Definition: Vehicle Maneuver/Pedestrian Action

  • 01 - Stopped in Travel Lane
  • 02 - Parked Out of Travel Lanes
  • 03 - Parked in Travel Lanes
  • 04 - Going Straight Ahead
  • 05 - Changing Lanes or Merging
  • 06 - Passing
  • 07 - Making Right Turn
  • 08 - Making Left Turn
  • 09 - Making U Turn
  • 10 - Backing
  • 11 - Slowing or Stopping
  • 12 - Starting in Roadway
  • 13 - Parking
  • 14 - Leaving Parked Position
  • 15 - Avoiding Object in Road
  • 16 - Other
  • 17 - Not Stated (Pre 2000)

 


Miscellaneous Action
SAS Name: MISACT1

Definition: Miscellaneous Action

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - Blank
  • ‘00’ - Not Stated
  • ‘01’ - Avoiding Pedestrian
  • ‘02’ - Avoiding Other Vehicle
  • ‘03’ - Avoiding Fixed Object
  • ‘04’ - Avoiding Animal
  • ‘05’ - Fire or Mechanical Failure
  • ‘06’ - Falling from Vehicle
  • ‘07’ - Driverless Moving Vehicle
  • ‘08’ - Skidding Out of Control
  • ‘09’ - Pushing or Towing Vehicle (Not Trailer)
  • ‘10’ - Vehicle Parked on Private Property
  • ‘11’ - Vehicle Legally Parked
  • ‘12’ - Vehicle and Driver Info Omitted
  • ‘13’ - Driver Info Added to Statistical Report Only
  • ‘14’ - Moped Info Added to Statistical Report Only

 


Most Harmful Event
SAS Name: MOSTHARM

Definition: Most Harmful Event in the crash sequence.

Additional Information:
1. Categories 33-63 are present for 2000 onwards. For earlier years all these information was captured in a single category 68 (hit fixed object).
2.  Similarly categories 18, 28, 29 and 32 are present for 2000 onwards. For earlier years they were coded either as Sideswipe (category 96) or other road (category 65).
3.   Categories 4.6.7.8.9.11.12 and 13 are coded from 2000 onwards.
4.  Categories 65, 66, 68 and 69 coded for years prior to 2000.

  • 00 - Unknown
  • 01 - Ran off Road Right
  • 02 - Ran Off Road Left
  • 03 - Ran Off Road Straight Ahead
  • 04 - Jackknife
  • 05 - Overturn/Rollover
  • 06 - Crossed Centerline/Median
  • 07 - Downhill Runaway
  • 08 - Cargo/Equipment Loss or Shift
  • 09 - Fire/Explosion
  • 10 - Immersion
  • 11 - Equipment Failure
  • 12 - Separation of Units
  • 13 - Other Non-Collision
  • 14 - Pedestrian
  • 15 - Pedalcyclist
  • 16 - RR Train, Engine
  • 17 - Animal
  • 18 - Movable Object
  • 20 - Parked Motor Vehicle
  • 21 - Rear End, Slow or Stop
  • 22 - Rear End, Turn
  • 23 - Left Turn, Same Roadways
  • 24 - Left Turn, Different Roadways
  • 25 - Right Turn, Same Roadways
  • 26 - Right Turn, Different Roadways
  • 27 - Head On
  • 28 - Sideswipe, Same Direction
  • 29 - Sideswipe, Opposite Direction
  • 30 - Angle
  • 31 - Backing Up
  • 32 - Other Collision with Vehicle
  • 33 - Tree
  • 34 - Utility Pole
  • 35 - Luminaire Pole Non-Breakaway
  • 36 - Luminaire Pole Breakaway
  • 37 - Official Highway Sign Non-Breakaway
  • 38 - Official Highway Sign Breakaway
  • 39 - Overhead Sign Support
  • 40 - Commercial Sign
  • 41 - Guardrail End on Shoulder
  • 42 - Guardrail Face on Shoulder
  • 43 - Guardrail End on Median
  • 44 - Guardrail Face on Median
  • 45 - Shoulder Barrier End
  • 46 - Shoulder Barrier Face
  • 47 - Median Barrier End
  • 48 - Median Barrier Face
  • 49 - Bridge Rail End
  • 50 - Bridge Rail Face
  • 51 - Overhead Part Underpass
  • 52 - Pier on Shoulder of Underpass
  • 53 - Pier in Median of Underpass
  • 54 - Abutment of Underpass
  • 55 - Traffic Island Curb or Median
  • 56 - Catch Basin or Culvert on Shoulder
  • 57 - Catch Basin or Culvert on Median
  • 58 - Ditch
  • 59 - Embankment
  • 60 - Mailbox
  • 61 - Fence or Fence Post
  • 62 - Construction Barrier
  • 63 - Crash Cushion
  • 64 - Other Fixed Object
  • 65 - Type Not Stated (Pre 2000)
  • 66 - Other in Road (Pre 2000)
  • 67 - Hit Moped (Pre 2000)
  • 68 - Hit Fixed Object (Pre 2000)
  • 69 - Sideswipe (Pre 2000)

 


Total A Injuries in Vehicle
SAS Name: NUM_A
Total B Injuries in Vehicle
SAS Name: NUM_B
Total C Injuries in Vehicle
SAS Name: NUM_C

Definition: Injuries in Vehicle

 


Total Killed in Vehicle
SAS Name: NUM_K

Definition: Total number killed in this vehicle.

 


Total Occupants in Vehicle
SAS Name: NUM_OCCS

Definition: Total number of occupants in this vehicle when the crash occurred.

Additional Information: Element discontinued from 2000 onwards.

 


Number of Points of Contact
SAS Name: NUM_POCS

Definition: Number of Points of Contact

Additional Information: Element discontinued from 2000 onwards.

 


Number of TAD Codes
SAS Name: NUM_TADS

Definition: Number of TAD Codes

Additional Information: Element discontinued from 2000 onwards.

 


Total Injured in Vehicle (K + A + B + C)
SAS Name: NUMINJ

Definition: Total number of occupants injured in this vehicle (including fatal injuries).

Additional Information: Element discontinued from 2000 onwards.

 


Number of Violations Indicated
SAS Name: NUMVIOLS

Definition: Number of Violations Indicated

Additional Information: Element discontinued from 2000 onwards.

  • ‘00’ - No Violations
  • ‘01’ - 1 Contrib/Viol
  • ‘02’ - 2 Contrib/Viols
  • ‘03’ - 3 Contrib/Viols
  • ‘04’ - 4 Contrib/Viols
  • ‘5’ – ‘99’ - 5+ Contrib/Viols         

 


Type of Object Struck
SAS Name: OBJECT1

Definition: Type of object struck by this vehicle when the crash occurred.

Additional Information: Element discontinued from 2000 onwards. See EVENT1-EVENT4.

  • ‘ ’ - Blank
  • ‘00’ - Not Stated
  • ‘01’ - None
  • ‘02’ - Parked Vehicle
  • ‘03’ - Bicycle or Moped
  • ‘04’ - Pedestrian
  • ‘05’ - Animal
  • ‘06’ - Tree
  • ‘07’ - Utility Pole (With/Without Pole)
  • ‘08’ - Luminaire Pole (Non-Breakaway)
  • ‘09’ - Luminaire Pole (Breakaway)
  • ‘10’ - Highway Sign (Non-Breakaway)
  • ‘11’ - Highway Sign (Breakaway)
  • ‘12’ - Commercial Sign
  • ‘13’ - Guardrail End on Shoulder
  • ‘14’ - Guardrail Fence on Shoulder
  • ‘15’ - Guardrail End in Median
  • ‘16’ - Guardrail Fence in Median
  • ‘17’ - Shoulder Barrier End
  • ‘18’ - Shoulder Barrier Face
  • ’19’ - Median Barrier End
  • ‘20’ - Median Barrier Face
  • ‘21’ - Bridge Rail End
  • ‘22’ - Bridge Rail Face
  • ‘23’ - Overhead Part of Underpass
  • ‘24’ - Pier on Shoulder of Underpass
  • ‘25’ - Pier in Median of Underpass
  • ‘26’ - Abutment (Supporting Wall) of Underpass
  • ‘27’ - Traffic Island Curb or Median
  • ‘28’ - Catch Basin or Culvert on Shoulder
  • ‘29’ - Catch Basin or Culvert on Median
  • ‘30’ - Ditch Bank
  • ‘31’ - Mailbox
  • ‘32’ - Fence or Fence Post
  • ‘33’ - Construction Barrier
  • ‘34’ - Crash Cushion
  • ‘35’ - Other Object

 


On Road
SAS Name: ON_RD

Definition: On Road

Additional Information: Element discontinued from 2000 onwards.

 


On Road Class
SAS Name: ONRD_CL

Definition: On Road Class

Additional Information: New element added in 2000.

  • ‘CL’ - County Line
  • ‘I’ - Interstate
  • ‘LCL’ - Local City Street
  • ‘MILE’ - Mile Marker
  • ‘ML’ - Municipal Limit
  • ‘NC’ - NC Route
  • ‘PP’ - Private Property
  • ‘PVA’ - Public Vehicular Area
  • ‘RP’ - Rural Paved
  • ‘RU’ - Rural Unpaved
  • ‘SL’ - State Line
  • ‘SR’ - State Route
  • ‘UNK’ - Unknown
  • ‘US’ - US Route

 


Other Unit Type
SAS Name: OTH_UNIT

Definition: Other Unit Type

Additional Information: Element discontinued from 2000 onwards.

 


Out of State Vehicle Registration
SAS Name: OUTSTATE

Definition: Out of State Vehicle Registration

Additional Information: Element discontinued from 2000 onwards

 


Vehicle Owner City
SAS Name: OWN_CITY

Definition: Vehicle Owner City

Additional Information: Element discontinued from 2000 onwards.

 


Vehicle Owner State
SAS Name: OWN_STAT

Definition: Vehicle Owner State

Additional Information: Element discontinued from 2000 onwards.

 


Vehicle Owner Zip Code
SAS Name: OWN_ZIP

Definition: Vehicle Owner Zip Code

Additional Information: Element discontinued from 2000 onwards.

 


Owner Category
SAS Name: OWNERTYP

Definition: Owner Category

Additional Information: Element format changed from 2000 onwards.

  • ‘0’ - Privately Owned Vehicle (Pre 2000)
  • ’1’ - Military Vehicle (Pre 2000)
  • ‘2’ - Emergency Vehicle (Pre 2000)
  • ‘3’ - State Owned Vehicle (Pre 2000)
  • ‘4’ - Public Owned Vehicle (Pre 2000)
  • ‘5’ - Privately Owned School Bus (Pre 2000)
  • ‘6’ - Commercial Owned School Bus (Pre 2000)
  • ‘7’ - State Owned School Bus (Pre 2000)

 


Indicator of Parked Vehicle
SAS Name: PARK_VEH

Definition: Indicator of Parked Vehicle

Additional Information: New element added in 2000. 

  • ‘ ’ - Traveling
  • ‘1’ - Parked

 


Non-Motorist Location Prior to Crash
SAS Name: PED_LOC

Definition: Location of the non-motorist prior to the crash.

Additional Information: New element added in 2000.

  • 01 - Marked Crosswalk at Intersection
  • 02 - At Intersection but No Crosswalk
  • 03 - Non-Intersection Crosswalk
  • 04 - Driveway Access Crosswalk
  • 05 - In Roadway
  • 06 - Not In Roadway
  • 07 - Median
  • 08 - Island
  • 09 - Shoulder
  • 10 - Sidewalk
  • 11 - Within 10 ft of Roadway
  • 12 - Beyond 10 ft of Roadway
  • 13 - Outside Trafficway
  • 14 - Shared Use Path or Trails

 


Non-Motorist Action
SAS Name: PEDACT

Definition: Non-Motorist Action

Additional Information: Categories 1-9 coded for years prior to 2000. For later years, categories 10-18 coded. The categories defined appear to be different and it seems there has been a change in what information is collected by this variable from years prior to 2000 and later years.

  • 00 - Unknown
  • 01 - Entering or Crossing Specified Location
  • 02 - Walking, Riding, Running/Jogging with Traffic
  • 03 - Walking, Riding, Running/Jogging against Traffic
  • 04 - Working
  • 05 - Pushing Vehicle
  • 06 - Approaching or Leaving Vehicle
  • 07 - Playing
  • 08 - Standing
  • 09 - Other
  • 10 - Pedestrian Crossing at Intersection
  • 11 - Pedestrian Crossing not at Intersection
  • 12 - Pedestrian From Behind Parked Vehicle
  • 13 - Pedestrian Walking with Traffic
  • 14 - Pedestrian Walking Against Traffic
  • 15 - Getting On or Off Vehicle
  • 16 - Lying in Road
  • 17 - Not in Road
  • 18 - Getting On or Off School Bus

 


Contributing Circumstances, Non-Motorist 1
SAS Name: PEDCONT1
Contributing Circumstances, Non-Motorists 2
SAS Name: PEDCONT2

Definition: Contributing Circumstances, Non-Motorist

Additional Information: New element added in 2000.

  • 00 - None
  • 01 - Coming From Behind Parked Vehicle
  • 02 - Darting
  • 03 - Lying and/or Illegally in Roadway
  • 04 - Failure to Yield Right of Way
  • 05 - Not Visible (Dark Clothing, Etc.)
  • 06 - Inattentive (Talking, Eating, Etc.)
  • 07 - Failure to Obey Traffic Signs, Signals
  • 08 - Wrong Side of Road
  • 09 - Other
  • 10 - Unknown

 


Pedestrian in Accident
SAS Name: PEDFLAG

Definition: Whether or not a pedestrian was involved in this accident.

Additional Information: New element added in 2000.

  • ‘N’ - Not Pedestrian Accident
  • ‘Y’ - Pedestrian Accident

 


Pupil Pedestrian Struck By (School Bus Crash)
SAS Name: PEDHITBY

Definition: What struck the pupil pedestrian in a school bus crash.

Additional Information: Element discontinued from 2000 onwards. Almost all observations are coded as missing.

  • ‘ ’ - Blank
  • ‘0’ - Not Applicable
  • ‘1’ - Pupil Pedestrian Struck by School Bus
  • ‘2’ - Pupil Pedestrian Struck by Passenger Car
  • ‘3’ - Pupil Pedestrian Struck by Truck
  • ‘4’ - Pupil Pedestrian Struck by Other Vehicle
  • ‘5’ - Pupil Pedestrian Struck by Flying Object
  • ‘6’ - Non-Pupil Pedestrian Struck by School Bus
  • ‘7’ - Non-Pupil Pedestrian Struck by Other Vehicle
  • ‘8’ - Non-Pupil Pedestrian Struck by Flying Object

 


Physical Condition of Driver
SAS Name: PHYSCOND

Definition: Physical condition of the driver when the crash occurred.

  • 01 - Apparently Normal
  • 02 - Illness
  • 03 - Fatigue
  • 04 - Fell Asleep, Fainted, Loss of Consciousness
  • 05 - Impairment Due to Medications, Drugs, Alcohol
  • 06 - Medical Condition
  • 07 - Other Physical Impairment
  • 08 - Restriction Not Complied With
  • 09 - Other
  • 10 - Unknown
  • 11 - Not Stated (Pre 2000)

 


Point of Contact #1
SAS Name: PTCONT1
Point of Contact #2
SAS Name: PTCONT2
Point of Contact #3
SAS Name: PTCONT3
Point of Contact #4
SAS Name: PTCONT4
Point of Contact #5
SAS Name: PTCONT5

Definition: Description of each point of contact for this vehicle.

  • ‘ ’ - Blank
  • ‘00’ - Not Stated
  • ‘01’ - RF VEH, CAB
  • ‘02’ - CF VEH, CAB
  • ‘03’ - LF VEH, CAB
  • ‘04’ - LF CRNR VEH, CAB
  • ‘05’ - LSF VEH, CAB
  • ‘06’ - LS CNTR VEH
  • ‘07’ - LSB VEH, CAB
  • ‘08’ - LR CRNR VEH, CB
  • ‘09’ - TRUNK VEH
  • ‘10’ - R Windshield VEH
  • ‘11’ - TOP VEH, CAB
  • ‘12’ - F W_SHLD VEH, CAB
  • ‘13’ - HOOD VEH, CAB
  • ‘14’ - LR VEH, CAB/F TRL
  • ‘15’ - CR VEH, CAB/F TRL
  • ‘16’ - RR VEH, CAB/F TRL
  • ‘17’ - RR CRNR VEH, CAB
  • ‘18’ - RSB VEH
  • ‘19’ - RS CNTR VEH, CAB
  • ‘20’ - RSF VEH, CAB
  • ‘21’ - RF CRNR VEH, CAB
  • ‘22’ - Underneath Front
  • ‘23’ - Underneath Center
  • ‘24’ - Underneath Rear
  • ‘25’ - Rollover
  • ‘26’ - Unknown
  • ‘27’ - Front, 2-WHL VEH
  • ‘28’ - Left, 2-WHL VEH
  • ‘29’ - Rear, 2-WHL VEH
  • ‘30’ - Right, 2-WHL VEH
  • ‘31’ - LSF TRLR
  • ‘32’ - LSB TRLR
  • ‘33’ - LR CRNR TRL
  • ‘34’ - LR TRL
  • ‘35’ - CR TRLR
  • ‘36’ - RR TRLR
  • ‘37’ - RR CRNR TRL
  • ‘38’ - RS BACK TRLR
  • ‘39’ - RF FRNT TRLR
  • ‘40’ - TOP TRL
  • ‘41’ - FRONT END-DISTR
  • ‘42’ - LEFT SIDE-DISTR
  • ‘43’ - REAR END-DISTR
  • ‘44’ - RIGHT SIDE DISTR

 


Distance to Object Struck
SAS Name: RD2OBJST

Definition: Location and distance from road to object struck by this vehicle.

  • 00 - None
  • 01 - In Road
  • 02 - Right of Road 0-10 ft
  • 03 - Right of Road 11-30 ft
  • 04 - Right of Road Over 30 ft
  • 05 - Left of Road 0-10 ft
  • 06 - Left of Road 11-30 ft
  • 07 - Left of Road Over 30 ft
  • 08 - Straight Ahead 0-10 ft
  • 09 - Straight Ahead 11-30 ft
  • 10 - Straight Ahead Over 30 ft

 


Region of Impact
SAS Name: REGION

Definition: Region of impact for this vehicle.

Additional Information: Element discontinued from 2000 onwards. See Point of Contact.

  • ‘ ’ - Blank
  • ‘1’ - Front Impact
  • ‘2’ - Right Side Impact
  • ‘3’ - Left Side Impact
  • ‘4’ - Rear End Impact
  • ‘5’ - Unspecified

 


Vehicle Rollover
SAS Name: ROLLOVER

Definition: Whether or not this vehicle rolled over during the crash sequence.

Additional Information: Element discontinued from 2000 onwards. 

  • ‘ ’ - Unknown
  • ‘0’ - Rolled Over
  • ‘1’ - No Roll Over

 


Vehicle Rollover – Determined by Using Point of Contact
SAS Name: ROLLPTCT

Definition: Cross Median

Additional Information: Vehicle Rollover – Determined by Using Point of Contact

  • 1 - Rolled Over
  • 2 - No Rollover

 


Vehicle Rollover – Determined by Using Tad Severity
SAS Name: ROLLTAD

Definition: Vehicle Rollover – Determined by Using Tad Severity

Additional Information: Element added in 1996, and discontinued from 1998 onwards.

  • 1 - Rolled Over
  • 2 - No Rollover

 


School Bus Contact Vehicle
SAS Name: SCH_BUS1

Definition:  Whether or not this vehicle was a school bus and was a contact vehicle in this crash.  

Additional Information: New element added in 2000.

  • 1 - Yes
  • 2 - No

 


School Bus Non-Contact Vehicle
SAS Name: SCH_BUS2

Definition: Whether or not this vehicle was a school bus and was a non-contact vehicle in this crash

Additional Information: New element added in 2000.

  • 1 - Yes
  • 2 - No

 


Chemical Test Given
SAS Name: SOB_TEST

Definition:  Presence and type of chemical test administered to this driver.

Additional Information: For years before 2000 all observations were coded as not stated. Observations coded as categories 1-6 for later years.

  • 0 - Not Test
  • 1 - Alcohol Test
  • 2 - Test for Other Drugs
  • 3 - Alcohol and Other Drugs Test
  • 4 - Test Refused
  • 5 - Unknown
  • 6 - Not Stated
  • 7 - Tested

 


Posted Speed Limit
SAS Name: SPDLIM

Definition: Posted speed limit for this vehicle.

  • 00 - Not Stated
  • 01 - Unknown
  • 10 - 10 Mph
  • 15 - 15 Mph
  • 20 - 20 Mph
  • 25 - 25 Mph
  • 30 - 30 Mph
  • 35 - 35 Mph
  • 40 - 40 Mph
  • 45 - 45 Mph
  • 50 - 50 Mph
  • 55 - 55 Mph
  • 60 - 60 Mph
  • 65 - 65 Mph
  • 70 - 70 Mph
  • 75 - 75 Mph
  • Other - Error Codes

 


Hazardous Cargo Spilled
SAS Name: SPILL

Definition: Whether or not this vehicle spilled hazardous cargo when the crash.

Additional Information: From 2000 onwards almost 100% observations coded as missing.

  • ‘ ’ - Blank
  • ‘0’ - Not Stated
  • ‘1’ - Hazardous Spill
  • ‘2’ - No Spill

 


Tire Impressions in Feet
SAS Name: TIRESKID

Definition: Length of tire impressions (skid marks) in feet.

  • 000 - 00 ft
  • 01-05 - 01-05 ft
  • 06-10 - 06-10 ft
  • 11-15 - 11-15 ft
  • 16-20 - 16-20 ft
  • 21-40 - 21-40 ft
  • 41-60 - 41-60 ft
  • 61-80 - 61-80 ft
  • 81-100 - 81-100 ft
  • 101-120 - 101-120 ft
  • 121-140 - 121-140 ft
  • 141-160 - 141-160 ft
  • 161-180 - 161-180 ft
  • 181-200 - 181-200 ft
  • 201-510 - Over 200 ft
  • 511 - Tire Impression Not Stated

 


Total Length of Trailer (S) (FT)
SAS Name: TOTLENG

Definition: Total length of all trailer(s) in feet for this commercial motor carrier.

Additional Information: Element discontinued from 2000 onwards.

 


Vehicle Drivable
SAS Name: TOWAWAY

Definition: Whether or not this vehicle was drivable after the crash (i.e., was not towed from scene).

  • 1 - Yes
  • 2 - No
  • 3 - Not Stated

 


Towed By
SAS Name: TOWED_BY

Definition: Who the vehicle involved in the crash was towed by.

Additional Information: Element discontinued from 2000 onwards.

 


Towed To
SAS Name: TOWED_TO

Definition: Where the vehicle involved in the crash was towed to.

Additional Information: Element discontinued from 2000 onwards.

 


Trailer Type
SAS Name: TRL_TYPE

Definition: Trailer Type

  • 00 - No Trailer
  • 01 - Boat Trailer
  • 02 - Camper
  • 03 - Utility Trailer
  • 04 - Horse Trailer
  • 05 - House Trailer
  • 06 - Towed Vehicle
  • 07 - Other Non-Semi Trailer
  • 08 - Tanker
  • 09 - Enclosed Van
  • 10 - Flatbed or Platform
  • 11 - Other Semi Trailer
  • 12 - Double Trailer

 


Data Present (Trailer #1)
SAS Name: TRL1_FLG
Data Present (Trailer #2)
SAS Name: TRL2_FLG

Definition: Data Present (Trailer)

Additional Information: Element discontinued from 2000 onwards.

  • ‘ ’ - No Trailer Dimension Available
  • ‘1’ - Dimensions Given
  • Other - Error/Other Code

 


Estimated Original Speed
SAS Name: TRVL_SPD

Definition: Estimated original speed of the vehicle involved in the crash.

  • 00 - Not Moving
  • 01-05 - 01-05 MPH
  • 06-10 - 06-10 MPH
  • 11-15 - 11-15 MPH
  • 16-20 - 16-20 MPH
  • 21-25 - 21-25 MPH
  • 26-30 - 26-30 MPH
  • 31-35 - 31-35 MPH
  • 36-40 - 36-40 MPH
  • 41-45 - 41-45 MPH
  • 46-50 - 46-50 MPH
  • 51-55 - 51-55 MPH
  • 56-60 - 56-60 MPH
  • 61-65 - 61-65 MPH
  • 66-70 - 66-70 MPH
  • 71-75 - 71-75 MPH
  • 76-80 - 76-80 MPH
  • 81-85 - 81-85 MPH
  • 86-HIGH - Over 85 MPH

 


Vehicle Underride/Override
SAS Name: UNDEROVR

Definition: Whether this vehicle underrides (e.g., goes under) or overrides (e.g., runs over) another vehicle in this crash.

Additional Information: New element added in 2000.

  • 1 - Underride
  • 2 - Override
  • 3 - Neither Underride or Override
  • 4 - Unknown

 


Unit Type
SAS Name: UNIT_TYP

Definition: Unit Type

Additional Information: For years prior to 2000 only categories 0 and 2 were coded.  Other categories, C, H, O, P and V are coded for later years.

  • ‘ ’ - Blank
  • ‘0’ - Unknown
  • ‘2’ - Not Commercial Vehicle
  • ‘C’ - Commercial
  • ‘H’ - Hit and Run]
  • ‘O’ - Other
  • ‘P’ - Pedestrian
  • ‘V’ - Vehicle

 


TAD #1 (Area of Damage) Location
SAS Name: V_DAMAGE
TAD #2 Location
SAS Name: V_DAMAGE2
TAD #3 Location
SAS Name: V_DAMAGE3

Definition:  Area(s) of damage to this vehicle based on TAD location.

  • ‘ ’ - Blank
  • ‘00’ - Not Stated
  • ‘01’ - FL
  • ‘02’ - FC
  • ‘03’ - FD
  • ‘04’ - FR
  • ‘05’ - RFQ
  • ‘06’ - RP
  • ‘07’ - RD, RSS
  • ‘08’ - RBQ
  • ‘09’ - R and T
  • ‘10’ - BR
  • ‘11’ - BC
  • ‘12’ - BD
  • ‘13’ - BBL
  • ‘14’ - L =and T
  • ‘15’ - LBQ
  • ‘16’ - LD, LSS
  • ‘17’ - LP
  • ‘18’ - LFQ
  • ‘19’ - TOP
  • ‘20’ - Uncodeable

 


Vehicle Seizure DWI
SAS Name: VEH_SEIZ

Definition:  Whether or not this vehicle was seized due to a DWI violation.

Additional Information: New element added in 2000.

  • 1 - Yes
  • 2 - Unknown

 


Vehicle Defect
SAS Name: VEH_DEF

Definition: Vehicle Defect

Additional Information: Element renamed in 2000 to veh_def.

  • ‘0’ - Not Stated
  • ‘1’ - Defective Brakes
  • ‘2’ - Defective Headlights
  • ‘3’ - Defective Rear Lights
  • ‘4’ - Defective Steering
  • ‘5’ - Defective Tires
  • ‘6’ - Other Defects
  • ‘7’ - Unknown
  • ‘8’ - No Defects

 


Vehicle Position
SAS Name: VEHNO

Definition: Vehicle Position

 


Vehicle Location Based on Road
SAS Name: VEHON

Definition: Vehicle Location Based on Road

Additional Information: Element discontinued from 2000 onwards.

 


Severity
SAS Name: VEHSEV

Definition: Most severe injury in this vehicle.

Additional Information: Element added in 1998, and discontinued from 1998 onwards.

  • 1 - No Injury
  • 2 - Class C Injury
  • 3 - Class B Injury
  • 4 - Class A Injury
  • 5 - Fatal Injury

 


Vehicle Type
SAS Name: VEHTYPE

Definition: Vehicle type of vehicle involved in the crash.

Additional Information: Coding for two-axle trucks changed between 1991 and 1992, when new codes were added (see discussion).

  • 01 - Passenger Car
  • 02 - Pickup
  • 03 - Light Truck ( Mini-Van, Panel)
  • 04* - Sport Utility
  • 05 - Van
  • 06 - Commercial Bus
  • 07 - School Bus
  • 08 - Activity Bus
  • 09* - Other Bus
  • 10 - Single Unit Truck (2-Axle, 6-Tire)
  • 11 - Single Unit Truck (3 Axles or More)
  • 12 - Truck/Trailer
  • 13 - Truck/Tractor
  • 14* - Tractor/Semi Trailer
  • 15* - Tractor/Doubles
  • 16* - Unknown Heavy Truck
  • 17 - Taxicab
  • 18 - Farm Equipment
  • 19 - Farm Tractor
  • 20 - Motorcycle
  • 21 - Moped
  • 22 - Motor Scooter 0r Motor Bike
  • 23 - Pedalcycle
  • 24 - Pedestrian
  • 25 - Motor Home/Recreational Vehicle
  • 26 - Other
  • 27* - All Terrain Vehicle ( ATV)
  • 28* - Fire Truck
  • 29 - EMS Vehicle, Ambulance, Rescue Squad
  • 30 - Military
  • 31* - Police
  • 32* - Unknown
  • 33** - Not Stated
  • 34** - 2, 4 Door Sedan
  • 35** - Station Wagon (Passenger)
  • 36** - Station Wagon (Truck)
  • 37** - Truck with Four Axles

* Categories Present in 2000 and later years.
** Categories present in years prior to 2000.

 


Model Year of Vehicle
SAS Name: VEHYR

Definition: Model year of vehicle involved in the crash.

Additional Information: Format YYYY where YYYY = Year.

 


Vehicle Identification Number
SAS Name: VIN

Definition: Vehicle Identification Number

Additional Information: Element discontinued from 2000 onwards. See next variable.

 


Vehicle Identification Number
SAS Name: VIN_ID

Definition: Vehicle Identification Number

Additional Information: New variable added in 2000.

 


Vision Obstruction
SAS Name: VISION

Definition: Vision obstruction for this vehicle’s driver that contributed to the crash.

  • 00 - None
  • 01 - Vehicle Window(s) Obscured
  • 02 - Trees, Crops, Brush, Etc
  • 03 - Building(s)
  • 04 - Embankment
  • 05 - Sign(s)
  • 06 - Hillcrest
  • 07 - Parked Vehicle(s)
  • 08 - Vehicle(s) in Traffic/Moving
  • 09 - Blinded, Headlights
  • 10 - Blinded, Sunlight
  • 11 - Blinded, Other Lights
  • 12 - Other
  • 13 - Unknown
  • 14 - Not Stated (Pre 2000)

 


Width of Trailer #1 (Inches)
SAS Name: WIDTRL

Definition: Width of Trailer #1 (Inches)

 


Width of Trailer #2 (Inches)
SAS Name: WIDTRL2

Definition: Width of Trailer #2 (Inches)

Additional Information: New element added in 1996.

 

Occupant Subfile

SAS VARIABLE NAME DESCRIPTION SAS VARIABLE FILE FORMAT TYPE PAGE NO
AGE OCCUPANT AGE Occupant NUM (8) 120
AIR_SW AIRBAG SWITCH STATUS Occupant NUM (8) 121
AIRDEPL AIRBAG DEPLOYED Occupant NUM (8) 121
CASENO NC ACCIDENT NUMBER WITH YR Occupant NUM (8) 121
EJECT EJECTION Occupant NUM (8) 121
EMS_DES EMERGENCY MEDICAL SERVICE Occupant NUM (50) 122
INJ OCCUPANT INJURY Occupant NUM (8) 122
PRSN_CTY PERSON COUNTY Occupant CHAR (22) 122
PRSN_DOB PERSON DATE OF BIRTH Occupant NUM (8) 122
PRSN_NBR PERSON NUMBER Occupant NUM (8) 122
PRSN_ST PERSON STATE Occupant CHAR (2) 123
PRSN_TYP PERSON TYPE Occupant NUM (8) 123
PRSN_ZIP PERSON ZIP CODE Occupant CHAR (9) 123
RACE OCCUPANT RACE Occupant NUM (8) 123
REST1 OCCUPANT RESTRAINT Occupant NUM (8) 124
SEATPOS SEATING POSITION Occupant NUM (8) 124
SEX OCCUPANT SEX Occupant NUM (8) 125
TRAPPED TRAPPED Occupant NUM (8) 125
TRT_FAC TREATMENT FACILITY NAME Occupant CHAR (100) 125
VEHNO VEHICLE POSITION NUMBER Occupant NUM (8) 125

SAS Format Definitions for Elements from the North Carolina Occupant Subfile

(1) SAS element names and longer explanatory names are shown above each listing. (See Discussion for information on SAS formats.)
(2) For all SAS-formatted elements below, an extra category labeled as "ERROR CODES" consolidates all values not listed as legitimate codes. This category is printed when elements are listed in tables.
(3) For consistency with other State's files and ease of handling, driver-related elements have been included in this Occupant Subfile as well as in the Vehicle Subfile.

 


Occupant Age
SAS Name: AGE

Definition: Age of occupant in the vehicle involved in the crash.

  • 0-1 - Infant - 1 yr
  • 2-4 - 02 -04 yrs
  • 5-10 - 05-10 yrs
  • 11-14 - 11-14 yrs
  • 15 - 15 yrs
  • 16 - 16 yrs
  • 17 - 17 yrs
  • 18 - 18 yrs
  • 19 - 19 yrs
  • 20 - 20 yrs
  • 21-25 - 21-25 yrs
  • 26-30 - 26-30 yrs
  • 31-35 - 31-35 yrs
  • 36-45 - 36-45 yrs
  • 46-55 - 46-55 yrs
  • 56-65 - 56-65 yrs
  • 66-75 - 65-77 yrs
  • 76-85 - 76-85 yrs
  • 86-97 - 86+ yrs
  • 98 - Not Occupied
  • 99 - Not Stated

 


Airbag Switch Status
SAS Name: AIR_SW

Definition: Airbag Switch Status

Additional Information: New element added in 2000.

  • 0 - No On-Off Switch
  • 1 - Switch in On Position
  • 2 - Switch in Off Position
  • 3 - Unknown if Switch Present
  • 4 - Unknown Position in Vehicle

 


Airbag Deployed
SAS Name: AIRDEPL

Definition: Whether or not the vehicle’s airbag was deployed when the crash occurred.

Additional Information: New element added in 2000.

  • ‘ ‘ - Blank
  • ‘0’ - Unknown
  • ‘1’ - Air Bag Deployed
  • ‘2’ - Not Deployed

 


NC Accident Number with Year
SAS Name: CASENO

Definition: NC Accident Number with Year

Additional Information:  Format YYNNNNNN, where YY = Year and NNNNNN = CASENUM.  Element type is CHAR for 1990 to 1999.

 


Ejection
SAS Name: EJECT

Definition: Ejection

Additional Information: New element added in 2000.

  • 1 - Not Ejected
  • 2 - Totally Ejected
  • 3 - Partially Ejected
  • 4 - Unknown

 


Emergency Medical Service
SAS Name: EMS_DES

Definition: Emergency Medical Service

Additional Information: New element added in 2000.

 


Occupant Injury
SAS Name: INJ

Definition: Injury to the occupant of the vehicle involved in the crash.

  • 1 - K Killed
  • 2 - A Type Injury (Disabling)
  • 3 - B Type Injury (Evident)
  • 4 - C Type Injury (Possible)
  • 5 - O No Injury
  • 6 - Not Stated (Pre 2000)
  • 7 - Not Occupied (Pre 2000)

 


Person City
SAS Name: PRSN_CTY

Definition: Person City

Additional Information: Element added in 2000 and discontinued from 2009 onwards. 

 


Person Date of Birth
SAS Name: PRSN_DOB

Definition: Date of birth for this occupant.

Additional Information: New element added in 2000.

 


Person Number
SAS Name: PRSN_NBR

Definition: Person Number

Additional Information: New element added in 2000.

 


Person State
SAS Name: PRSN_ST

Definition: Person State

Additional Information: New element added in 2000.

 


Person Type
SAS Name: PRSN_TYP

Definition: Person Type

Additional Information: New element added in 2000.

  • 1 - Driver
  • 2 - Passenger
  • 3 - Pedestrian
  • 4 - Pedalcyclist
  • 5 - Roller Skater, Roller Blader, Etc.
  • 6 - Other
  • 7 - Unknown

 


Person Zip Code
SAS Name: PRSN_ZIP

Definition: Person Zip Code

Additional Information: New element added in 2000.

 


Occupant Race
SAS Name: RACE

Definition: Race of the occupant of the vehicle involved in the crash.

  • 1 - White
  • 2 - Black
  • 3 - Native American
  • 4 - Hispanic
  • 5 - Asian
  • 6 - Other
  • 7 - Unknown
  • 8 - Not Occupied (Pre 2000)
  • 9 - Non-White (Pre 2000)

 


Occupant Restraint
SAS Name: REST1

Definition: Occupant restraint used by this occupant.

  • 00 - None Used
  • 01 - Lap Belt Only
  • 02 - Shoulder and Lap Belt
  • 03 - Shoulder Belt Only
  • 04 - Child Restraint
  • 05 - Helmet
  • 06 - Protective Pads
  • 07 - Reflective Clothing
  • 08 - Lighting
  • 09 - Other
  • 10 - Unable to Determine
  • 11 - Not Stated (Pre 2000)
  • 12 - Unknown (Pre 2000)
  • 13 - Not Occupied (Pre 2000)

 


Seating Position
SAS Name: SEATPOS

Definition: Seating position for this occupant.

  • 01 - Front – Left
  • 02 - Front – Middle
  • 03 - Front – Right
  • 04 - Second Seat – Left
  • 05 - Second Seat – Middle
  • 06 - Second Seat – Right
  • 07 - Third Row – Left
  • 08 - Third Row – Middle
  • 09 - Third Row – Right
  • 10 - Sleeper Section of Cab
  • 11 - Passenger in Other Enclosed Area
  • 12 - Passenger in Unenclosed Area
  • 13 - Trailing Unit
  • 14 - Riding on Vehicle Exterior
  • 15 - Unknown

 


Occupant Sex
SAS Name: SEX

Definition: Sex of the occupant in the vehicle involved in the crash.

  • 1 - Male
  • 2 - Female
  • 3 - Unknown
  • 4 - Not Stated (Pre 2000)
  • 5 - Not Occupied (Pre 2000)

 


Trapped
SAS Name: TRAPPED

Definition: Whether this occupant was trapped in the vehicle as a result of the crash.

Additional Information:  New element added in 2000.

  • 0 - No
  • 1 - Yes
  • 2 - Unknown

 


Treatment Facility Name
SAS Name: TRT_FAC

Definition: Treatment Facility Name

Additional Information: New element added in 2000.

 


Vehicle Position Number
SAS Name: VEHNO

Definition: Vehicle Position Number

Additional Information: Number of vehicle on accident report. The vehicle position number is needed (along with CASENO) for linking this seated occupant to the corresponding vehicle observation in the vehicle file. This information was copied from the North Carolina Vehicle Subfile element named VEHNO.

 

Roadway Inventory File 101

SAS VARIABLE NAME DESCRIPTION SAS VARIABLE FILE FORMAT TYPE PAGE NO
AADT AVER ANNUAL DAILY TRAFFIC Roadway NUM (8) 129
AADT_YR YEAR OF ADT Roadway CHAR (2) 129
ACCESS ACCESS CONTROL Roadway CHAR (1) 130
AREATYPE AREA TYPE Roadway CHAR (1) 130
BEGMP BEGIN MILEPOST Roadway NUM (8) 130
CNTR_PEAK_ NUMBER OF LANES IN THE DIRECTION OPPOSITE TO THE PEAK HOUR DIRECTION FLOW Roadway NUM (8) 130
CNTYRTE COUNTY ROUTE NUMBER Roadway CHAR (10) 131
COUNTY COUNTY Roadway CHAR (2) 131
DHRVOL DESIGN HOUR VOLUME Roadway CHAR (2) 132
DIV HIGHWAY DIVISION ROUTE Roadway CHAR (2) 132
ENDMP ENDING MILEPOST Roadway NUM (8) 132
FUNC_CLS FUNCTIONAL CLASS Roadway CHAR (2) 133
FUNC_ST FUNCTIONAL CLASS (STATE) Roadway CHAR (1) 133
HOV_LN_CNT NUMBER OF HOV LANES Roadway NUM (8) 133
HOV_TYP_CD TYPE OF LANES USED FOR HOV EXCLUSIVELY OR DURING SPECIFIED TIME PERIODS Roadway NUM (8) 133
HPMS1 HPMS SAMPLE ID Roadway NUM (8) 133
IMPROVE1 TYPE OF RECENT IMPROVEMENT Roadway CHAR (2) 134
INTSTMP INTERSTATE MILEPOST Roadway CHAR (5) 134
INV_CNTL INVENTORY CONTROL Roadway CHAR (1) 135
LISTCNTL LIST CONTROL Roadway CHAR (1) 135
LSHL_TYP LEFT SHOULDER TYPE Roadway CHAR (2) 136
LSHLDWID LEFT SHOULDER WIDTH Roadway NUM (8) 137
LT_PARK LEFT PEAK PARK Roadway CHAR (1) 137
MED_TYPE MEDIAN TYPE Roadway CHAR (1) 137
MEDWID MEDIAN WIDTH TOTAL Roadway NUM (8) 138
MVMT MILLION VEHICLE MILES TRAVELLED Roadway NUM (8) 138
NHS NATIONAL HIGHWAY SYSTEM Roadway CHAR (1) 138
NO_LANES NUMBER OF LANES- TOTAL Roadway CHAR (1) 139
ONEWAY_DIR ONE WAY DIRECTION Roadway NUM (8) 139
PAVECOND PAVEMENT CONDITION Roadway CHAR (2) 139
PAVED_LSHLDWID PAVED SHOULD WIDTH (LEFT) Roadway NUM (8) 139
PAVED_RSHLDWID PAVED SHOULD WIDTH (RIGHT) Roadway NUM (8) 139
PCT_TRK1 PERCENT TRUCKS Roadway CHAR (2) 140
PEAK_TRK PERCENT TRUCKS AT PEAK Roadway CHAR (1) 140
PEAKLANE NUMBER OF LANES IN THE PEAK HOUR DIRECTION OF FLOW Roadway NUM (8) 141
POP_GRP POPULATION GROUP Roadway CHAR (1) 141
PSTD_RTE_C POSTED ROUTES Roadway CHAR (7) 141
PTCSTAT PORTABLE TRAFFIC COUNTER Roadway CHAR (8) 142
RECCONTCD RECORD CONTINUATION CODE Roadway CHAR (1) 142
RODWYCLS ROAD WAY CLASS VARIABLE Roadway CHAR (2) 142
ROUGH PAVEMENT ROUGHNESS Roadway CHAR (3) 142
ROW RIGHT OF WAY Roadway CHAR (2) 143
RSHL_TYP RIGHT SHOULDER TYPE Roadway CHAR (2) 143
RSHLDWID RIGHT SHOULDER WIDTH Roadway NUM (8) 144
RT_PARK RIGHT PEAK PARK Roadway CHAR (1) 144
RTE_NBR ROUTE INVENTORIED Roadway CHAR (8) 144
RTE_TYPE ROUTE TYPE (1ST DIGIT OF RTE_NBR) Roadway CHAR (1) 145
RULURBID RURAL URBAN IDENTIFICATION Roadway CHAR (2) 145
SCENIC SCENIC BYWAY Roadway CHAR (1) 145
SEG_LNG SECTION LENGTH IN MILES Roadway NUM (8) 145
SIGHTDIS SIGHT DISTANCE Roadway CHAR (2) 145
SPD_LIMT SPEED LIMIT Roadway CHAR (2) 145
SPEC_SYS SPECIAL SYSTEM Roadway CHAR (1) 146
STATE_SY STATE HIGHWAY SYSTEM Roadway CHAR (1) 147
STRCTR_CD LOCATION OF BRIDGES, TUNNEL AND CAUSEWAYS Roadway NUM (8) 147
STREET_NAM STREET NAME Roadway NUM (20) 148
SURF_TYP SURFACE TYPE Roadway CHAR (2) 148
SURF_WID SURFACE WIDTH TOTAL Roadway NUM (8) 148
TERRAIN TERRAIN Roadway CHAR (1) 148
TOLL_DIRECTION TOLL CHARGED Roadway CHAR (7) 149
TOWN TOWN Roadway CHAR (2) 149
TRFGROW TRAFFIC GROWTH FACTOR Roadway NUM (8) 149
TRK_RTE DESIGNATED TRUCK ROUTE Roadway CHAR (1) 149
TRNLNWD TURN LANE WIDTH Roadway NUM (8) 149
UPDATE_ UPDATE Roadway NUM (8) 150
URB_LOC URBAN LOCATION Roadway CHAR (1) 150
URB_POP RUR/URB DESIGNATED BY POP Roadway CHAR (1) 150
WTDSGSPD WEIGHTED DESIGN SPEED Roadway CHAR (2) 150
YEAR YEAR OF TRAFFIC COUNT Roadway NUM (8) 151
YR_IMPR1 YEAR OF RECENT IMPROVEMENT Roadway CHAR (2) 151
YRADD YEAR ADDED Roadway CHAR (2) 151

SAS Format Definitions for Elements from the North Carolina Roadway Inventory File

SAS element names and longer explanatory names are shown above each listing. (See Discussion for information on SAS formats.)

 


Average Annual Daily Traffic
SAS Name: AADT

Definition: Average Annual Daily Traffic

Additional Information: AADT estimates for a roadway segment in the 2001 and earlier files will not necessarily be consistent with estimates in 2002 and later. AADT estimates for road segments with a functional class of rural or urban “local” in 2008 and earlier files are often based on (very) old raw count data. See Discussion. 

  • 00000 - Unknown
  • 00001-00100 - 0-1000
  • 00101-00500 - 101-500
  • 00501-01000 - 501- 1000
  • 01001-02000 - 1001- 2000
  • 02001-05000 - 2001-5000
  • 05001-10000 - 5001-10000
  • 10001-15000 - 10000-15000
  • 15001-20000 - 15001-20000
  • 20001-40000 - 20001-40000
  • 40001-999999 - 40000

 


Year of ADT
SAS Name: AADT_YR

Definition: Year of ADT

Additional Information: Format YY where YY = Year.

 


Access Control
SAS Name: ACCESS

Definition: Access Control

  • ‘1’ - No Access Control
  • ‘2’ - Partial Control
  • ‘3’ - Full Control

 


Area Type
SAS Name: AREATYPE

Definition: Area Type

Additional Information: Element discontinued from 2009.

  • ‘0’ - Rural Not Within Urban Area
  • ‘1’ - Rural Within Metro Area Not AQNA
  • ‘2’ - Rural Within Metro Area with AQNA
  • ‘3’ - Rural Not Within Metro Area with AQNA
  • ‘4’ - Small Urban Area Within Metro Area Not AQNA
  • ‘5’ - Small Urban Area Within Metro Area with AQNA
  • ‘6’ - Small Urban Area Not In Metro Not AQNA
  • ‘7’ - Small Urban Area Not in Metro with AQNA
  • ‘8’ - Urban Area Not AQNA
  • ‘9’ - Urban Area with AQNA

 


Begin Milepost
SAS Name: BEGMP

Definition: Begin Milepost

Additional Information:  Coincidence routes 1-6 information is also available in the data.

 


Number of Lanes in the Direction Opposite To the Peak Hour Direction Flow
SAS Name: CNTR_PEAK_

Definition: Number of Lanes in the Direction Opposite To the Peak Hour Direction Flow.

Additional Information:  New variable added in 2010.

 


County Route Number
SAS Name: CNTYRTE

Definition: County Route Number

 


County
SAS Name: COUNTY

Definition: County

  • ‘00’ - Alamance
  • ‘01’ - Alexander
  • ‘02’ - Allegheny
  • ‘03’ - Anson
  • ‘04’ - Ashe
  • ‘05’ - Avery
  • ‘06’ - Beaufort
  • ‘07’ - Bertie
  • ‘08’ - Bladen
  • ‘09’ - Brunswick
  • ‘10’ - Buncombe
  • ‘11’ - Burke
  • ‘12’ - Cabarrus
  • ‘13’ - Caldwell
  • ‘14’ - Camden
  • ‘15’ - Carteret
  • ‘16’ - Caswell
  • ‘17’ - Catawba
  • ‘18’ - Chatham
  • ’19’ - Cherokee
  • ‘20’ - Chowan
  • ‘21’ - Clay
  • ‘22’ - Cleveland
  • ‘23’ - Columbus
  • ‘24’ - Craven
  • ‘25’ - Cumberland
  • ‘26’ - Currituck
  • ‘27’ - Dare
  • ‘28’ - Davidson
  • ‘29’ - Davie
  • ’30’ - Duplin
  • ‘31’ - Durham
  • ‘32’ - Edgecombe
  • ‘33’ - Forsyth
  • ‘34’ - Franklin
  • ‘35’ - Gaston
  • ‘36’ - Gates
  • ‘37’ - Graham
  • ‘38’ - Granville
  • ‘39’ - Greene
  • ‘40’ - Guilford
  • ‘41’ - Halifax
  • ‘42’ - Harnett
  • ‘43’ - Haywood
  • ‘44’ - Henderson
  • ‘45’ - Hertford
  • ‘46’ - Hoke
  • ‘47’ - Hyde
  • ‘48’ - Iredell
  • ‘49’ - Jackson
  • ‘50‘ - Johnston
  • ‘51’ - Jones
  • ‘52’ - Lee
  • ‘53’ - Lenoir
  • ‘54’ - Lincoln
  • ‘55’ - Macon
  • ‘56’ - Madison
  • ‘57’ - Martin
  • ‘58’ - McDowell
  • ‘59’ - Mecklenburg
  • ‘60’ - Mitchell
  • ‘61’ - Montgomery
  • ‘62’ - Moore
  • ‘63’ - Nash
  • ‘64’ - New Hanover
  • ‘65’ - North Hampton
  • ‘66’ - Onslow
  • ‘67’ - Orange
  • ‘68’ - Pamlico
  • ‘69’ - Pasquotank
  • ‘70’ - Pender
  • ‘71’ - Perquimans
  • ‘72’ - Person
  • ‘73’ - Pitt
  • ‘74’ - Polk
  • ‘75’ - Randolph
  • ‘76’ - Richmond
  • ‘77’ - Robeson
  • ‘78’ - Rockingham
  • ‘79’ - Rowan
  • ‘80’ - Rutherford
  • ‘81’ - Sampson
  • ‘82’ - Scotland
  • ‘83’ - Stanly
  • ‘84’ - Stokes
  • ‘85’ - Surry
  • ‘86’ - Swain
  • ‘87’ - Transylvania
  • ‘88’ - Tyrrell
  • ‘89’ - Union
  • ‘90’ - Vance
  • ‘91’ - Wake
  • ‘92’ - Warren
  • ‘93’ - Washington
  • ‘94’ - Watauga
  • ‘95’ - Wayne
  • ‘96’ - Wilkes
  • ‘97’ - Wilson
  • ‘98’ - Yadkin
  • ‘99’ - Yancey

 


Design Hour Volume
SAS Name: DHRVOL

Definition: Design Hour Volume

Additional Information: Discontinued from 2008 onwards. 

 


Highway Division Route
SAS Name: DIV

Definition: Highway Division

Additional Information: For data before 2010, City/Town Code has to be combined with DIV (i.e. Highway Division Route) variable to get 4-digit City/Town codes. Contact HSIS staff for more information on codes for the city element. 

 


Ending Milepost
SAS Name: ENDMP

Definition: Ending Milepost

Additional Information: Coincidence routes 1-6 information is available in the data.

 


Functional Class
SAS Name: FUNC_CLS

Definition: Functional Class

  • ‘01’ - Rural Principle Arterial – Interstate
  • ‘03’ - Rural Principal Arterial – Other
  • ‘04’ - Rural Minor Arterial
  • ‘06’ - Rural Major Collector
  • ‘07’ - Rural Minor Collector
  • ‘08’ - Rural Local
  • ’09’ - Urban Principal Arterial – Interstate
  • ’10’ - Urban Principal Arterial – Freeways and Expressways
  • ‘11’ - Urban Principal Arterial – Other
  • ‘12’ - Urban Minor Arterial
  • ‘13’ - Urban Collector
  • ‘14’ - Urban Local

 


Functional Class Provided by the State
SAS Name: FUNC_ST

Definition: Functional Class Provided by the State

Additional Information: Element for internal use.  Use the element FUNC_CLS to capture the information about FUNCTIONAL CLASS.

 


Number of HOV Lanes
SAS Name: HOV_LN_CNT

Definition: Number of HOV Lanes

 


Type of Lanes Used For HOV Exclusively or During Specified Time Periods
SAS Name: HOV_TYP_CD

Definition: Type of Lanes Used For HOV Exclusively or During Specified Time Periods.

 


HPMS Sample ID
SAS Name: HPMS1

Definition: HPMS Sample ID

Additional Information: This element was not available from 2002-2008.

 


Type of Recent Improvement
SAS Name: IMPROVE1

Definition: Type of Recent Improvement

  • ‘NL’ - Relocation
  • ‘NR’ - New Construction
  • ‘NE’ - New Construction-HPMS
  • ‘RF’ - Reconstruction of Freeway
  • ‘RL’ - Reconstruction with More Lanes
  • ‘RW’ - Reconstruction to Widen Lanes
  • ‘RP’ - Pavement Reconstruction
  • ‘RI’ - ISO Reconstruction
  • ‘MA’ - Major Widening
  • ‘MI’ - Minor Widening
  • ‘CS’ - Conc. Resurface with Shoulder Improvement
  • ‘BS’ - Bituminous Resurface with Shoulder Improvement
  • ‘RC’ - Concrete Resurfacing
  • ‘RB’ - Bituminous Resurfacing
  • ‘IP’ - Initial Paving
  • ’00-41’ - Surface Type Change
  • ‘RE’ - Restoration and Rehab
  • ‘BR’ - Bridge Replacement
  • ‘BH’ - Major Bridge Rehab
  • ‘BM’ - Minor Bridge Rehab
  • ‘ST’ - Safety/ Traffic Oper
  • ‘OT’ - Environmentally Related

 


Interstate Milepost
SAS Name: INTSTMP

Definition: Interstate Milepost

 


Inventory Control
SAS Name: INV_CNTL

Definition: Inventory Control

Additional Information: Element discontinued from 2009 onwards. 

  • ‘1’ - Both Directions
  • ‘2’ - Northbound Only
  • ‘3’ - Southbound Only
  • ‘4’ - Eastbound Only
  • ‘5’ - Westbound Only
  • ‘6’ - Common Record
  • ‘7’ - Gap Record

 


List Control
SAS Name: LISTCNTL

Definition: List Control

Additional Information: Element discontinued from 2009 onwards.

  • ‘1’ - Normal Listing Sequence
  • ‘2’ - Information Listed at the End of Route
  • ‘3’ - Additional Group Listed at the End of Route

 


Left Shoulder Type
SAS Name: LSHL_TYP

Definition: Left Shoulder Type

Additional Information: This element doesn’t provide information on the inside shoulder for divided highways. It gives the shoulder type for the outside shoulder across the opposite direction travel lanes. Inside shoulder information for divided highways is available for a very few miles and it is not possible to identify those. Hence for all analysis consider this to be the outside shoulder type for the opposite direction travel lane. See discussion section.

  • ‘ ‘ - Unknown
  • ‘01’ - Grass/Sod
  • ‘02’ - Gravel
  • ‘B3’ - Paved 1-2 ft
  • ‘B4’ - Paved 3-4 ft
  • ‘B5’ - Paved 5-6 ft
  • ‘B6’ - Paved 7-8 ft
  • ‘B7’ - Paved 9 ft
  • ‘B8’ - Paved 10+ ft
  • ‘B9’ - Curb
  • ‘C3’ - P.C. Concrete 1-2 ft
  • ‘C4’ - P.C. Concrete 3-4 ft
  • ‘C5’ - P.C. Concrete 5-6 ft
  • ‘C6’ - P.C. Concrete 7-8 ft
  • ‘C7’ - P.C. Concrete 9 ft
  • ‘C8’ - P.C. Concrete 10+ ft
  • ‘C9’ - P.C. Concrete Curb
  • ‘T4’ - P.C.C. 3-4 ft w/ Tie Bars
  • ‘T5’ - P.C.C. 5-6 ft w/ Tie Bars
  • ‘T6’ - P.C.C. 7-8 ft w/ Tie Bars
  • ‘T7’ - P.C.C. 9 ft w/ Tie Bars
  • ‘T8’ - P.C.C. 10+ ft w/ Tie Bars

New Formats for Data from 2009 onwards

  • ‘00’ - Unknown
  • ‘03’ - Bituminous Material
  • ‘04’ - Curb Bituminous (Butimouns with Curb)
  • ‘05’ - Concrete (Portland Cement Concrete Surface)
  • ‘06’ - Curb Concrete (Concrete Curb)
  • ‘07’ - Tie Bar (Shoulder Contains Tie Bars

 


Left Shoulder Width
SAS Name: LSHLDWID

Definition: Width of the left shoulder.

Additional Information:  One

  • 0,  - Unknown
  • 1-3 - 1-3 ft
  • 4-6 - 4-6 ft
  • 7-9 - 7-9 ft
  • 10-13 - 10-13 ft
  • 14-25 - 14-25 ft
  • 26 - No Parking
  • 27 - Parallel Parking
  • 28 - Angle Parking

 


Peak Parking Left
SAS Name: LT_PARK

Definition: Type of parking on the left side of the road segment during the peak period.

  • ‘A’ - Angular Parking
  • ‘N’ - No Parking
  • ‘P’ - Parallel Parking

 


Median Type
SAS Name: MED_TYPE

Definition: Median Type

  • ‘0’ - Undivided Roadway
  • ‘1’ - Rigid Pos Barrier
  • ‘2’ - Continuous Turn Lane
  • ‘3’ - Paved Mountable
  • ‘4’ - Curb
  • ‘5’ - Grass
  • ‘6’ - Positive Barrier
  • ‘7’ - Parkland, Business
  • ‘8’ - Couplet
  • ‘9’ - Flexible Pos Barrier
  • ‘10’ - Striped
  • ‘11’ - Semi-Rigid Pos Barrier

 


Median Width –Total
SAS Name: MEDWID

Definition: Median Width –Total

Additional Information: Median width is measured from edge of traveled lane to edge of opposing lane.  It includes paved and unpaved inside shoulder width.

  • 000 - Zero ft
  • 1-10 - 1-10 ft
  • 11-20 - 11-20 ft
  • 21-30 - 21-30 ft
  • 31-40 - 31-40 ft
  • 41-50 - 41-50 ft
  • 51-60 - 51-60 ft
  • 61-90 - 61-90 ft
  • 91-99 - 91+ ft
  • 100 - Unknown or N/A
  • 101 - Couplet – 1 Way
  • 102 - Couplet – 2 Way

 


Million Vehicle Miles Traveled
SAS Name: MVMT

Definition: Million Vehicle Miles Traveled

Additional Information: Million Vehicle Miles Traveled

 


National Highway System
SAS Name: NHS

Definition: Whether this roadway section is part of the National Highway System.

Additional Information: New element added in 1993.

  • ‘0’ - Not NHS Section
  • ‘2’ - NHS Section

 


Number of Lanes – Total
SAS Name: NO_LANES

Definition: Number of lanes – total for both directions.

  • ‘0’ - Unknown
  • ‘1’ - 1 Lane
  • ‘2’ - 2 Lanes
  • ‘3’ - 3 Lanes
  • ‘4’ - 4 Lanes
  • ‘5’ - 5 Lanes
  • ‘6’ - 6 Lanes
  • ‘7’ - 7 Lanes
  • ‘8’ - 8 Lanes
  • ‘9’ - 9 or More Lanes

 


One Way Direction
SAS Name: ONEWAY_DIR

Definition: Whether or not this section of road carries traffic in both or only one direction.

Additional Information: New element added in 2009.

  • 0 - Both Directions
  • 1 - One Direction

 


Pavement Condition
SAS Name: PAVECOND

Definition: Pavement Condition

Additional Information: Discontinued from 2009 onwards see pvmty_qlty element.

 


Paved Shoulder Width (Left)
SAS Name: PAVED_LSHLDWID

Definition: Paved Shoulder Width (Left)

 


Paved Shoulder Width (Right)
SAS Name: PAVED_RSHLDWID

Definition: Paved Shoulder Width (Right)

 


Total Percent Trucks
SAS Name: PCT_TRK1

Definition: Total Percent Trucks

Additional Information: Here, approximately 90% of the section mileage is coded as “unknown” for years prior to 2000.  From 2000 – 2011, only 2% - 6% is coded as “unknown” or zero. The percent estimates in 2011 and earlier are based on “legacy” counts. The 2012 and later percent estimates are based on a new vehicle classification method felt to be more accurate. See Discussion.

  • 0 - Unknown
  • 01-10 - 1-10%
  • 11-20 - 11-20%
  • 21-30 - 21-30%
  • 31-40 - 31-40%
  • 41-50 - 41-50%
  • 51-50 - 51-60%
  • 61-70 - 61-70%
  • 71-80 - 71-80%
  • 81-90 - 81-90%
  • 91-99 - 91-99%

 


Percent Trucks at Peak
SAS Name: PEAK_TRK

Definition: Percent Trucks at Peak

Additional Information: This element is coded as “unknown” or zero for over 75% of the mileage. Element discontinued from 2009 onwards

  • ‘0’ - Unknown
  • ‘1’ - Under 5%
  • ‘2’ - 5-9.99%
  • ‘3’ - 10% and Over

 


Number of Lanes in the Peak Hour Direction of Flow
SAS Name: PEAKLANE

Definition: Number of Lanes in the Peak Hour Direction of Flow

Additional Information: Number of lanes in the peak hour direction of flow, only if the value is not equals to ½ the number of lanes for undivided roads, or the number of lanes in the peak direction if the road is divided in the LRS. No data indicates that the information can be derived from the Number of Lanes Table.

 


Population Group
SAS Name: POP GRP

Definition: Population Group

Additional Information: Categories are defined by size of incorporated area. (See RURUB, URB_POP and Discussion)

  • ‘0’ - UNINCORP + Rural
  • ‘1 - Under 100o Population
  • ‘2’ - 1000-2499
  • ‘3’ - 2500-4999
  • ‘4’ - 5000-9999
  • ‘5’ - 10000-24999
  • ‘6’ - 25000-49999
  • ‘7’ - 50000-99999
  • ‘8’ - 100000 Plus

 


Posted Routes
SAS Name: PSTD_RTE_C

Definition: Posted Routes

Additional Information: A system of designated secondary routes where truck traffic with axle weights exceeding 13,000 pounds is prohibited by ordinance. The value is the ordinance number; any value present indicates that the segment is part of the Posted Route system. New variable from 2012.

 


Portable Traffic Counter
SAS Name: PTCSTAT

Definition: Whether or not the crash occurred on a way one direction street.

Additional Information: Variable was discontinued from 2008 onwards.

 


Record Continuation Code
SAS Name: RECCONTCD

Definition: Record Continuation Code

Additional Information: New element added in 1999 and discontinued from 2009 onwards. 

 


Roadway Class
SAS Name: RODWYCLS

Definition: Roadway class.

Additional Information: For 2003 and later years, the number of miles available in the system is greater than earlier years. This results in higher mileages for some categories – especially in rural 2-lane and others. See discussion

  • ‘01’ - Urban Freeways
  • ‘02’ - Urban Freeways Less Than 4 Lanes
  • ‘03’ - Urban 2-Lane Road
  • ‘04’ - Urban Multilane Divided Non-Freeway
  • ‘05’ - Urban Multilane Undivided Non-Freeway
  • ‘06’ - Rural Freeways
  • ‘07’ - Rural Freeways Less than 4 Lanes
  • ‘08’ - Rural 2-Lane Roads
  • ‘09’ - Rural Multilane Divided Non-Freeway
  • ‘10’ - Rural Multilane Undivided Non-Freeway
  • ’99’ - Others

 


Pavement Roughness
SAS Name: ROUGH

Definition: Roughness of the pavement.

Additional Information: Discontinued from 2009 onwards.

 


Right of Way
SAS Name: ROW

Definition: Width of right of way.

 


Right Shoulder Type
SAS Name: RSHL_TYP

Definition: Right Shoulder Type

Additional Information: Approximately 3 to 5 percent of the mileage is coded as unknown.

  • ‘ ‘ - Unknown
  • ‘01’ - Grass/Sod
  • ‘02’ - Gravel
  • ‘B3’ - Paved 1-2 ft
  • ‘B4’ - Paved 3-4 ft
  • ‘B5’ - Paved 5-6 ft
  • ‘B6’ - Paved 7-8 ft
  • ‘B7’ - Paved 9 ft
  • ‘B8’ - Paved 10+ ft
  • ‘B9’ - Curb
  • ‘C3’ - P.C. Concrete 1-2 ft
  • ‘C4’ - P.C. Concrete 3-4 ft
  • ‘C5’ - P.C. Concrete 5-6 ft
  • ‘C6’ - P.C. Concrete 7-8 ft
  • ‘C7’ - P.C. Concrete 9 ft
  • ‘C8’ - P.C. Concrete 10+ ft
  • ‘C9’ - P.C. Concrete Curb
  • ‘T4’ - P.C.C. 3-4 ft w/ Tie Bars
  • ‘T5’ - P.C.C. 5-6 ft w/ Tie Bars
  • ‘T6’ - P.C.C. 7-8 ft w/ Tie Bars
  • ‘T7’ - P.C.C. 9 ft w/ Tie Bars
  • ‘T8’ - P.C.C. 10+ ft w/ Tie Bars

New Formats for Data from 2009 onwards

  • ‘00’ - Unknown
  • ‘03’ - Bituminous Material
  • ‘04’ - Curb Bituminous (Butimouns with Curb)
  • ‘05’ - Concrete (Portland Cement Concrete Surface)
  • ‘06’ - Curb Concrete (Concrete Curb)
  • ‘07’ - Tie Bar (Shoulder Contains Tie Bars)

 


Right Shoulder Width
SAS Name: RSHLDWID

Definition: Right Shoulder Width

Additional Information: Approximately 12 percent of the mileage have unknown shoulder widths. 

  • 0, . - Unknown
  • 1-3 - 1-3 ft
  • 4-6 - 4-6 ft
  • 7-9 - 7-9 ft
  • 10-13 - 10-13 ft
  • 14-25 - 14-25 ft
  • 26 - No Parking
  • 27 - Parallel Parking
  • 28 - Angle Parking

 


Peak Parking Right
SAS Name: RT_PARK

Definition: Type of parking on the right side of the road segment during the peak period.

  • ‘A’ - Angular Parking
  • ‘N’ - No Parking
  • ‘P’ - Parallel Parking

 


Route Inventoried
SAS Name: RTE_NBR

Definition: Route Inventoried

Additional Information: Coincidence routes 1-6 information is also available in the data.

 


Route Type (1st Digit of RTE_NBR)
SAS Name: RTE_TYPE

Definition: Route Type (1st Digit of RTE_NBR)

Additional Information: Coincidence routes 1-6 information is also available in the data.

  • ‘1’ - Interstate
  • ‘2’ - US Route
  • ‘3’ - NC Route
  • ‘4’ - Secondary

 


Rural Urban Identification
SAS Name: RULURBID

Definition: Rural Urban Identification

Additional Information: New element added in 1992.

 


Scenic Byway
SAS Name: SCENIC

Definition: Scenic Byway

Additional Information: New element added in 1999 and discontinued from 2002 onwards.

 


Section Length in Miles
SAS Name: SEG_LNG

Definition: Section Length in Miles

 


Sight Distance
SAS Name: SIGHTDIS

Definition: Sight Distance

 


Speed Limit
SAS Name: SPD_LIMT

Definition: Speed Limit

 


Special System
SAS Name: SPEC_SYS

Definition: Special System designator.

  • 0 - Road is Owned by NCDOT
  • 1 - State Highway Agency
  • 2 - County Highway Agency
  • 3 - Town or Township Highway Agency
  • 4 - City or Municipal Highway Agency
  • 6 - Local Park, Forest, or Reservation Agency
  • 7 - Other State Agency
  • 8 - Other Local Agency
  • 9 - Private (Other Than Railroad)
  • 10 - Railroad
  • 11 - State Toll Authority
  • 12 - Local Toll Authority
  • 13 - Other Public Instrumentality (e.g. Airport, School, University)
  • 14 - Indian Tribe Nation
  • 15 - Other Federal Agency
  • 16 - Bureau of Indian Affairs
  • 17 - Bureau of Fish and Wildlife
  • 18 - US Forest Service
  • 19 - National Park Service
  • 20 - Tennessee Valley Authority
  • 21 - Bureau of Land Management
  • 22 - Bureau of Reclamation
  • 23 - Corps of Engineers
  • 24 - Air Force
  • 25 - Navy/Marine
  • 26 - Army
  • 27 - Other
  • 28 - Appalachian Highway Access Road
  • 29 - National Forest Highway System Not Common with Appalachian
  • 30 - Blue Ridge Parkway (Mainline)
  • 31 - National Park, Including Great Smokies National Park, National Seashore Rec. Area, National Monuments Areas Maintained by NPS
  • 32 - Cherokee Indian Reservation Roads on or off the State System Not Common with Appalachian
  • 33 - Military Reservations (Non-Strahnet)
  • 34 - National Wildlife Refuge
  • 35 - Addition to Interstate(s) Approved on or after March 9, 1984
  • 36 - Addition to Interstate 23 USC 139 B
  • 37 - Addition to Interstate 23 USC 139 (A) Approved before March 8, 1984
  • 38 - Appalachian Development Highway, Common with and Addition to Interstate System -23 USC 139 (A) Approved before March 9, 1984
  • 39 - App. Development Highway Not Common with the NFH System and Outside the National Forest
  • 40 - App. Development Highway Not Common with the NFH System and Inside the National Forest
  • 41 - Section 332 Interstate Systems that Meet Interstate Design Standards
  • 42 - Designated Future Section 332 Interstate Systems
  • 43 - Not Known, State Park, State Forest, State Recreation Area

Following Formats for Pre 2009 Data

  • 50 - Appalachian Highway
  • 51 - National Forest Highway
  • 52 - National Forest Development Roads
  • 53 - Blue Ridge Service Road
  • 54 - Priority Primary Highways
  • 55 - Additional to Interstate System 139 (A)
  • 56 - Appalachian Development Highway

 


State Highway System
SAS Name: STATE_SY

Definition: State Highway System

Additional Information: Discontinued from 2009 onwards.

 


Location of Bridges, Tunnels and Causeways
SAS Name: STRCTR_CD

Definition: Location of Bridges, Tunnels and Causeways

Additional Information: New element added in 2010.

 


Street Name
SAS Name: STREET_NAM

Definition: Street Name

 


Surface Type
SAS Name: SURF_TYP

Definition: Surface Type

  • ‘00’ - 00 Primitive (Not Use don State System)
  • ‘10’ - 10 – Unimproved
  • ‘20’ - 20 – Graded and Drained
  • ‘30’ - 30 – Soil Surfaced
  • ‘41’ - 41 – Gravel or Stone
  • ‘51’ - 51 – Bituminous Surf Treatment on Topsoil
  • ‘52’ - 52 – Bituminous Surf Treatment on Gravel or Stone
  • ‘60’ - 60 – Mixed Bituminous, Non-Rigid Base
  • ‘61’ - 61 – Mixed Bituminous, Rigid Base
  • ‘62’ - 62 – Bituminous Penetration, Rigid Base
  • ‘63’ - 63 – Bituminous Penetration, Non-Rigid Base
  • ‘65’ - 65 – Sand Asphalt on Types Other Than 66, 67
  • ‘66’ - 66 – Sand Asphalt on Bituminous Concrete
  • ‘67’ - 67 – Bituminous Concrete
  • ’70-76’ - 70 Portland Cement Concrete
  • ‘80’ - 80 – Brick
  • ‘90’ - 90 – Block
  • ‘99’ - 99 – Hard Surface

 


Surface Width – Total
SAS Name: SURF_WID

Definition: Surface Width – Total

 


Terrain
SAS Name: TERRAIN

Definition: Terrain

  • ‘1’ - Flat
  • ‘2’ - Rolling
  • ‘3’ - Mountainous

 


Toll Charged
SAS Name: TOLL_DIRECTION

Definition: The travel direction, if any, that a toll is charged

  • ‘1’ - One direction
  • ‘2’ - Both directions
  • ‘3’ - No charge

Additional Information: New variable in 2012.

 


Town
SAS Name: TOWN

Definition: Town

 


Traffic Growth Factor
SAS Name: TRFGROW

Definition: Traffic Growth Factor

Additional Information: Discontinued from 2009 onwards.

 


Designated Truck Route
SAS Name: TRK_RTE

Definition: Designated Truck Route

  • ‘1’ - Not a Truck Route
  • ‘2’ - Parkway – No Truck Allowed
  • ‘3’ - Trucks Prohibited
  • ‘4’ - Trucks Limited
  • ‘5’ - Truck Route

 


Turn Lane Width
SAS Name: TRNLNWD

Definition: Turn Lane Width

Additional Information: New element added in 1992 and discontinued from 2009 onwards.

 


Update
SAS Name: UPDATE_

Definition: Update

Additional Information: Format MM/DD/YY where MM = Month, DD = Day, and YY = Year. New element added in 1999 and discontinued from 2009 onwards.

 


Urban Location
SAS Name: URB_LOC

Definition: Urban Location

Additional Information: Element discontinued from 2002 onwards.

 


Rural/Urban Designated by Population
SAS Name: URB_POP

Definition: Rural/Urban Designated by Population

Additional Information: Categories are defined by a combination of the census-related “urbanized area” definition and population groups. (See POP_GRP and Discussion)

  • ‘0’ - Unincorporated
  • ‘1’ - Rural Incorporated < 2500
  • ‘2’ - Rural Incorporated < 5000
  • ‘3’ - Urban < 25000
  • ‘4’ - Urban < 50000
  • ‘5’ - City < 100000
  • ‘6’ - City < 200000
  • ‘7’ - City < 500000

 


Weighted Design Speed
SAS Name: WTDSGSPD

Definition: Weighted Design Speed

Additional Information: Calculated value based on degree and lengths of curves of tangents in the HPMS sample section.

 


Year of Traffic Count
SAS Name: YEAR

Definition: Year of Traffic Count

Additional Information: Format YYYY where YYYY = Year. New element added in 1999 and discontinued from 2009 onwards.

 


Year of Recent Improvement
SAS Name: YR_IMPR1

Definition: Year of Recent Improvement

 


Year Added
SAS Name: YRADD

Definition: Year Added