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

Rushi Patel
Yusuf 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

January 2006

TABLE OF CONTENTS

• INTRODUCTION
• DETAILS OF MAJOR FILES
  • The Accident Files
  • The Roadway Inventory File
  • Traffic Data
  • Issues Related to Developing and Merging Files
• NORTH CAROLINA CONTACTS
• COMPOSITE LIST OF VARIABLES
• SAS FILE FORMATS
  • Accident Files
    • Accident Subfile
    • Vehicle Subfile
    • Occupant Subfile
  • Roadway Inventory File

INTRODUCTION

(Changes from the earlier version are in bold and italics)

The North Carolina database, which is incorporated into the HSIS system, is derived from an Oracle database on the “NCDMV” system.  Before 2000, the data was derived from the “MERGE” system –- a mainframe database -- maintained by the NCDOT MIS group. North Carolina provides data to HSIS in four different files -- accident characteristics, vehicles in the accidents, occupants in the vehicles, and roadway inventory.  The first three files are derived from the “NCDMV” system, while the roadway inventory file is provided by the NCDOT GIS section. The roadway file contains information on traffic counts.  As with the other HSIS states, these four files (three accident subfiles plus roadway inventory) are then SAS formatted and loaded into the HSIS system. The raw file data are provided to the Highway Safety Research Center where they 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 FHWA offices. HSIS team at FHWA maintains the conversion programs developed by HSRC and LENDIS, CORP. to convert the files into SQL and SAS formats.

Beginning in 1994, the HSIS system has been converted to a relational database for internal use. This database, originally a SYBASE system and now an ORACLE system, stores the data received from North Carolina and other states, and the data files for a given state are linked and manipulated using SQL language.  However, this conversion from the original SAS-based system to the newer relational system is somewhat transparent to the end-user of the data since the output files produced by ORACLE for modeling and analysis will be SAS formatted.  As in the past, we have continued to produce SAS format libraries for each of the variables in each of the files.  Because it is envisioned that the majority of analyses will utilize these SAS files and formats, this Guidebook will concern these SAS files -- their formats, completeness, and quality.

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 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 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 approximately 230,000 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.  It should be noted that the number of linkable accidents has increased considerably from 2002 onwards. This is because the number of inventoried miles to which crashes can be mileposted has increased. Hence, for 2003, HSIS has about 145,000 crashes that are linkable to the roadway inventory. Before 2003, the number of linkable crashes was significantly lower (about 100,000 in 2001 and about 95,000 in 1997). The HSIS currently includes data from 1990 through 2004.

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. Of the 77,000 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 and 2003, approximately 62,000 miles are included, which results in a significant increase in linkable accidents.   (It is noted that the 39,000 miles total for pre-2002 years 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.  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.

In short, the computer assigns a milepost to an accident based on the route it is on and the distance to a nearby reference point.  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.

Even with the lack of computerized reference mileposts for some of the roadways, and with errors due to changes in city street names, approximately 120,000 accidents per year are mileposted. Again, note that the number of mileposted accidents for 2003 is approximately 145,000. It is felt by NC DOT and other users that approximately 80 to 90 percent of the mileposted accidents 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.

As indicated above, North Carolina is in the process of beginning to update 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 Engineering 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 and 2003 reflects the higher number of crashes that are present for these years because of a higher number of linkable roads. Ratings of vehicle damage severity, useful in analyzing and controlling for crash severity, are captured in the TAD ratings.  Unlike any other HSIS state, information on truck trailer width and length and total truck length is captured from the accident report form until 2000.  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, and estimates of distance from the roadway to the fixed object struck. 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.

The Occupant subfile includes information on all occupants in a vehicle, whether injured or not.  This file contains approximately 300,000 occupants each year (and this number is lower for years before 2002 as the number of accidents in HSIS for 2002 and 2003 has increased considerably), 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.

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. If warranted for a special study, linkage for the pre-1999 data might be accomplished through driver license number, driver name, and date of crash.

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 Engineering Branch 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

The roadway inventory information is the responsibility of the Roadway Inventory Section, GIS Branch, of the NC Division of Highways.  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 Roadway Inventory Section who input data from the plans.  Thus, the updating is done on an ongoing basis.  The file is usually completely updated by April 1 of the following year for the preceding December 31 closeout.

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 77,000 miles of roadway in the NC DOT roadway inventory system, approximately 14,000 of which are primary roadways. The 77,000 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.

Of the 77,000 miles in the state system, approximately 62,000 miles are now in the computer mileposting system, allowing accidents to be linked to them. These are the miles in the HSIS system. As noted before, these 62,000 miles are significantly higher than the 35,000 miles that were captured in the NC roadway inventory system for earlier years. This is not because of new roads were built, but reflects a sustained NC DOT effort to enter these existing miles into the “mileposting” computer program, making linking accidents to these miles possible. As noted above, this mileage includes all 14,000 miles of primary roadways plus an additional 48,000 miles of secondary roadways and urban streets.  Note here that before 2002, the miles of primary roads in the roadway inventory system was the same, around 14,000, but the miles in the secondary system was around 21,000. 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, 2003.  As expected since it is a state-controlled system, the file is predominately rural in nature, with close to 84% of the roadways 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.)

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 and peak period 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” flag, which denotes the year of the last improvement, made to the section.  There is a second variable, which denotes the general type of improvement.  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.  Using this information, a "generic" roadway improvement-history file could be developed as years of inventory data are accumulated into HSIS.

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 a majority of the divided roadways (as discussed below) and, most importantly, information on either horizontal curve or vertical grade data.  With respect to the latter two data items, the North Carolina DOT Traffic Engineering Branch is considering using temporary employees to develop horizontal and vertical files from CADD drawings for the Interstate system and certain other major roadways.  This project has not yet been funded.

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.).

Traffic data

As indicated above, the basic AADT and percent truck information is included on the Roadway Inventory File.  This information comes from the NCDOT traffic monitoring system, which consists of a Continuous Count Program and a Coverage 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 90 Automatic Traffic Recording stations collect volume data (ATRs) and 50 Weigh-In-Motion stations collect 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 Count program.

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 40,000 volume-monitoring stations and 570 vehicle classification-monitoring stations.  Using information from the Continuous Count stations, these 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.  There is comprehensive volume coverage of major routes but only key secondary routes are monitored.  AADT data are used in Highway Performance Monitoring System (HPMS) reporting through the Roadway Inventory File.  Truck statistics in this file are updated on an ad hoc basis.

Vehicle classification counts are screened for data quality and compared to historic values at the same station.  This data are used primarily to generate statewide averages by functional class of highway to meet HPMS reporting requirements.  The existing monitoring stations support a sample based analysis and a comprehensive coverage of truck data are not available at this time.  Vehicle classification coverage counts are updated on a three-year cycle.

Finally, the Projects Program within NC DOT 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 600 manual counts are collected annually within the program.  Major external origin and destination studies and travel time studies are conducted infrequently to provide more detailed information.  (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.

North Carolina Contacts

State liaison and accident data contact – Kevin Lacy (919-733-5467, jklacy@dot.state.nc.us) – Mr. Lacey, the NC State Traffic Engineer, is the primary contact when questions arise concerning the data.  In his absence, questions are submitted to Terry Hopkins, State Traffic Safety Engineer (919-733-5418, thopkins@dot.state.nc.usk), Brian Mayhew, Manager, Traffic Safety Systems Section (919-715-7818, bmayhew@dot.state.nc.us) and Jeff Jaeger, Traffic Safety Project Engineer (919-733-3915, jjaeger@dot.state.nc.us).

Roadway Inventory information -- L. C. Smith (919-212-6001) -- Mr. Smith is the Director of the Geographic Information Systems (GIS) Unit, and is the contact person for questions related to the specifics of the Roadway Inventory File.  His office staff is responsible for all aspects of the basic inventory information and file preparation.

Traffic Counts – Kent Taylor (919-212-4550, kltaylor@dot.state.nc.us) – Mr. Taylor is the Supervisor of the State Traffic Survey Group within the NC Division of Highways.  He is responsible for the statewide traffic count program.  He forwards AADT and truck count information to Mr. Smith for inclusion in the Inventory File.

Composite List of Variables

SAS File Formats

Accident Files

Accident Subfile

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE NORTH CAROLINA ACCIDENT SUBFILE

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.

ACC_DATE

ACCIDENT DATE-MMDDYY

NON-LABELED VARIABLE -- See Raw File Documentation.

Note: Variable has YYYYMMDD format up to 1999, where YYYY = year, MM = Month and DD = Day. From 2000 onwards the variable captures the time of the accident as well.

ACCESS

ACCESS CONTROL

• 1 = 'NO ACCESS CONTROL'
• 2 = 'FULL ACCESS CONTROL'
• 3 = 'PARTIAL ACCESS CONTROL'

NOTE: New variable added in 2000.

ACCTYPE

FIRST HARMFUL EVENT

• 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* = 'OHTER IN ROAD'
• 34* = 'HIT OTHER OBJECT'
• 35* = 'TYPE NOT STATED'
• 36 = 'SIDESWIPE'

* Categories discontinued from 2000 onwards.

** Categories added from 2000 onwards.

NOTE: (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) There is a significant decrease in run-off road crashes from 1999 to 2000. This is because quiet 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 2000 and later years appear to be similar to category 36 for 1999 and earlier years.

ACCYR

ACCIDENT YEAR

NON-LABELED VARIABLE -- See Raw File Documentation.

Format YYYY Where YYYY=Year.

NOTE: Variable discontinued from 2000 onwards.

ADD_DAMG

ADDITIONAL PROPERTY DAMAGE

• 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'

NOTE: Variable discontinued from 2000 onwards.

AGENCY

INVESTIGATING AGENCY

• '0' = 'NOT STATED'
• '1' = 'MUNICIPAL POLICE'
• '2' = 'SHERIFF'
• '3' = 'RURAL, COUNTY POLICE'
• '4' = 'HIGHWAY PATROL'
• '5' = 'OTHER AGENCY'

NOTE: Variable discontinued from 2000 onwards.

ALCFLAG

ALCOHOL/DRUGS IN ACCIDENT

• 'N' ='NO DRINK OR DRUG' ('0' For Pre 2000)
• 'Y' ='INTOXICATION CODE 2 OR 3' ('1' For Pre 2000)

AMB_TIME

TIME OF AMBULANCE REQUEST

NON-LABELED VARIABLE -- See Raw File Documentation.

Format HHMM where HH=HOUR and MM=MINUTE.

NOTE: Variable discontinued from 2000 onwards.

AMBUL

AMBULANCE REQUESTED

• '0',' ' = 'NOT STATED'
• '1' = 'AMBULANCE CALLED'
• '2' = 'NOT REQUESTED'

NOTE: Variable discontinued from 2000 onwards.

BIKEFLAG

BICYCLE IN ACCIDENT

• 'N' = 'NOT BICYCLE ACC' ('0' For Pre 2000)
• 'Y' = 'BICYCLE ACC' ('1' For Pre 2000)

CASENO

YEAR + CASE NUMBER

NON-LABELED VARIABLE -- See Raw File Documentation.

Format YYNNNNNN Where YY=YEAR and NNNNNN=CASENUM.

NOTE: Variable type is CHAR for 1990 to 1999.

CITY

CITY/TOWN CODE (INCL CO)

Note: Contact HSIS staff for more information on codes for the city variable. Also note that the city variable codes are different for pre 2000 and post 2000 years. HSIS staff maintains a list of all these codes.

CNTY_RTE

COUNTY ROUTE NUMBER

NON-LABELLED VARIABLE ‑‑ See Raw File Documentation.

Computed Variable, used for linkage with the Road log variable.

COMMFLAG

COMMERCIAL VEHICLE IN ACCIDENT

• '0' = 'NOT COMMERCIAL VEHICLE ACCIDENT'
• '1' = 'COMMERCIAL VEHICLE ACCIDENT'

NOTE: Variable discontinued from 1999 onwards.

COUNTY

NC COUNTYNUMBER

• 00 = 'ALAMANCE'
• 01 = 'ALEXANDER'
• 02 = 'ALLEGHANY'
• 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 = 'LENIOR'
• 54 = 'LINCOLN'
• 55 = 'MACON'
• 56 = 'MADISON'
• 57 = 'MARTIN'
• 58 = 'MCDOWELL'
• 59 = 'MECKLENBERG'
• 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 = 'TYRRELL'
• 89 = 'UNION'
• 90 = 'VANCE'
• 91 = 'WAKE'
• 92 = 'WARREN'
• 93 = 'WASHINGTON'
• 94 = 'WATAUGA'
• 95 = 'WAYNE'
• 96 = 'WILKES'
• 97 = 'WILSON'
• 98 = 'YADKIN'
• 99 = 'YANCEY'

DAY

DAY OF THE MONTH

NON-LABELLED VARIABLE -- See Raw File Documentation.

Format DD Where DD=Day of the Month (01 to 31).

NOTE: Variable added in 1998, and discontinued from 2000 onwards.

DEPT_CDE

REPORTING DEPARTMENT CODE

NON-LABELLED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

DEVELOP

DEVELOPMENT AMOUNT

• 0 = 'NOT STATED' (Pre 2000)
• 1 = 'RURAL (<30% DEVELOPED)'
• 2 = 'MIXED (30% TO 70% DEVELOPED)'
• 3 = 'URBAN (>70% DEVELOPED)'

FRM_RD

FROM ROAD

NON-LABELLED VARIABLE -- See Raw File Documentation.

FRMRD_CL

FROM ROAD CLASS

• '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'

NOTE: New variable added in 2000.

FROM_DIR

DIRECTION FROM FRM_RD

• 'E' = 'EAST'
• 'N' = 'NORTH'
• 'NE' = 'NORTH EAST'
• 'NW' = 'NORTH WEST'
• 'S' = 'SOUTH'
• 'SE' = 'SOUTH EAST'
• 'SW' = 'SOUTH WEST'
• 'W' = 'WEST'
• ‘00’ = ‘UNKNOWN’

Note: Variable discontinued from 2000 onwards.

HAZFLAG

HAZMAT VEHICLE IN ACCIDENT

• '0' = 'NO HAZMAT VEHICLE ACC'
• '1' = 'HAZMAT VEHICLE IN ACC'

NOTE: Variable discontinued from 1999 onwards.

HITRUN

HIT AND RUN ACCIDENT

• '0' = 'NOT HIT AND RUN ACC'
• '1' = 'HIT AND RUN ACC'

NOTE: Variable discontinued from 2000 onwards.

HOUR

HOUR

• 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 PM'
• 16 = '4:00 ‑ 4:59 PM'
• 17 = '5:00 ‑ 5:59 PM'
• 18 = '6:00 ‑ 6:59 PM'
• 19 = '7:00 ‑ 7:59 PM'
• 20 = '8:00 ‑ 8:59 PM'
• 21 = '9:00 ‑ 9:59 PM'
• 22 = '10:00 ‑ 10:59 PM'
• 23 = '11:00 ‑ 11:59 PM'
• 24 = 'NOT STATED'

NOTE: Variable discontinued from 2000 onwards.

LIGHT

LIGHT CONDITION

• 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'

LOC_TYPE

ACCIDENT LOCATION TYPE

• 00 = 'NO SPECIAL FEATURE'
• 01 = 'BRIDGE'
• 02 = 'BRIDGE APPROACH'
• 03 = 'UNDERPASS'
• 04 = 'DRIVEWAY, PUBLIC'
• 05 = 'DRIVEWAY, PRIVATE'
• 06 = 'ALLEY 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 PATHS 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

NOTE: (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.

LOCALITY

DEVELOPMENT TYPE

• 0 = 'NOT STATED'
• 1 = 'FARMS, WOODS, PASTURES’
• 2 = 'RESIDENTIAL'
• 3 = 'COMMERCIAL'
• 4 = 'INSTITUTIONAL'
• 5 = 'INDUSTRIAL'
• 6 = 'UNKNOWN'

MCFLAG

MOTORCYCLE IN ACCIDENT

• '0' = 'NOT MOTORCYCLE ACC'
• '1' = 'MOTORCYCLE ACC'

NOTE: Variable discontinued from 2000 onwards.

MEANS

MEANS OF INVOLVEMENT

• '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 ACC'

NOTE: Variable discontinued from 2000 onwards.

MHARM_AC

MOST HARMFUL EVENT

• 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 = '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'

NOTE: New variable added in 2000.

MILEPOST

MILEPOST

NON-LABELED VARIABLE -- See Raw File Documentation.

MONTH

MONTH OF ACCIDENT

• '01' = 'JANUARY'
• '02' = 'FEBRUARY'
• '03' = 'MARCH'
• '04' = 'APRIL'
• '05' = 'MAY'
• '06' = 'JUNE'
• '07' = 'JULY'
• '08' = 'AUGUST'
• '09' = 'SEPTEMBER'
• '10' = 'OCTOBER'
• '11' = 'NOVEMBER'
• '12' = 'DECEMBER'

NOTE: Variable discontinued from 2000 onwards.

MOPEDFLG

MOPED IN ACCIDENT

• '0' = 'NOT MOPED ACC'
• '1' = 'MOPED ACC'

NOTE: Variable discontinued from 2000 onwards.

MUNI_DIR

DIRECTION FROM MUNICIPALITY TO ACCIDENT

• 'E' = 'EAST'
• 'N' = 'NORTH'
• 'NE' = 'NORTH EAST'
• 'NW' = 'NORTH WEST'
• 'S' = 'SOUTH'
• 'SE' = 'SOUTH EAST'
• 'SW' = 'SOUTH WEST'
• 'W' = 'WEST'

NOTE: New variable added in 2000.

MUNI_DIS

DISTANCE FROM MUNICIPALITY IN MILES

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

MVMT

MILLION VEHICLE MILES TRAVELED

NON-LABELLED VARIABLE -- Million Vehicle Miles Traveled on Road Segment.

NOTE: Variable discontinued from 2000 onwards.

NBR_LANE

NUMBER OF LANES (CRASH RE)

• 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'

NEARTOWN

IN OR NEAR TOWN

• 1 = 'YES'
• 2 = 'NO'

NOTE: New variable added in 2000.

NON_REP

NON-REPORTABLE

• 1 = 'YES'
• 2 = 'NO'

NOTE: New variable added in 2000.

NONMTCNT

NON-MOTORIST COUNT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

NUM_UNIT

NUMBER OF UNITS

NON-LABELED VARIABLE -- See Raw File Documentation.

NUMVEHS

NUMBER OF VEH+PED+BIKE

NON-LABELED VARIABLE -- See Raw File Documentation.

OFFCR_ST

REPORTING OFFICERSTATE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

ON_RD

ON ROAD

NON-LABELED VARIABLE -- See Raw File Documentation.

ONRD_CL

ON ROAD CLASS

• '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'

NOTE: New variable added in 2000.

PATROLAC

PATROL AREA CODE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

PEDFLAG

PEDESTRIAN IN ACCIDENT

• 'N' = 'NOT PEDESTRIAN ACCIDENT' ('0' For Pre 2000)
• 'Y' = 'PEDESTRIAN ACCIDENT' ('1' For Pre 2000)

PLOTQUAL

QUALITY OF MILEPOST

• '0' = '-BLANK-'
• '1' = 'GOOD LOCATION'
• '2' = 'LOOP, OK DIRECT'
• '3' = 'BAD DIRECTION'
• '4' = 'LOOP, BAD DIRECT'
• '5' = 'LOCATED ON YLINE'
• '6' = 'ADJUST TO RT END'
• '7' = 'PRIVATE PROPERTY'
• '8' = 'CANNOT MILEPOST'
• '9' = 'ROUTE IS INVALID'

NOTE: Variable discontinued from 2000 onwards.

POP_GRP

CITY POPULATION IN 1000

• 0 = '< 1000 - RURAL'
• 1-4 = '1,000 - 4,999'
• 5-9 = '5,000 - 9,999'
• 10-19 = '10,000 ‑ 19,999'
• 20-34 = '20,000 ‑ 34,999'
• 35-49 = '35,000 ‑ 49,999'
• 50-74 = '50,000 ‑ 74,999'
• 75-99 = '75,000 ‑ 99,999'
• 100-HIGH = '100,000+'

NOTE: The unit of this variable 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.

PROPDAM

TOTAL PROPERTY DAMAGE

• 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'

PVA

PUBLIC VEHICULAR AREA

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

RD_CHAR1

ROAD CHARACTER

• 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'

RD_CONF

ROAD CONFIGURATION

• 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.

NOTE: 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.

RD_PAVE

TYPE OF ROAD SURFACE (REP)

• ' ' = 'UNCODED'
• 0 = 'NOT STATED'
• 1 = 'CONCRETE'
• 2 = 'GROOVED CONCRETE'
• 3 = 'SMOOTH ASPHALT'
• 4 = 'COARSE ASPHALT'
• 5 = 'GRAVEL'
• 6 = 'SAND'
• 7 = 'SOIL'
• 8 = 'OTHER'

RDSURF

SURFACE CONDITION

• 00 = 'NOT STATED' (Pre 2000)
• 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.

REFDISFT

DISTANCE FROM FRM_RD IN FEET

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

REFDISMI

DISTANCE FROM FRM_RD IN MILES

NON-LABELED VARIABLE -- See Raw File Documentation.

REL_RD

RELATION TO ROADWAY

• 1 = 'ON ROADWAY'
• 2 = 'SHOULDER'
• 3 = 'MEDIAN'
• 4 = 'ROADSIDE'
• 5 = 'OUTSIDE TRAFFICWAY'
• 6 = 'UNKNOWN'

NOTE: New variable added in 2000.

REPORT

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.

RMP_SVRD

RAMP OR SERICE ROAD

• -BLANK- = ‘UNCODED’
• 1 = 'YES'

NOTE: New variable added in 2000.

ROAD_CLS

ROAD CLASSIFICATION

• 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'

NOTE: New variable added in 2000.

ROADCNT1

ROADWAY CONTRIBUTING CIRCUMSTANCE 1

ROADCNT2

ROADWAY CONTRIBUTING CIRCUMSTANCE 2

• 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)

NOTE: New variable added in 2000.

RODWYCLS

ROAD WAY CLASS

• '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'

RRX_NUM

RAILROAD CROSSING NUMBER

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

RRXFLAG

RAILROAD CROSS NOT INDICATED

• ' ' = '-BLANK-'
• '0' = 'NOT AT RAILROAD CROSSING'
• '1' = 'AT RAILROAD CROSSING'

NOTE: Variable discontinued from 2000 onwards.

RTE_NBR

MILEPOSTED ROUTE

NON-LABELED VARIABLE -- See Raw File Documentation.

RURURB

RURAL-URBAN IDENTIFICATION

• 'R' = 'RURAL'
• 'U' = 'URBAN'

NOTE: New variable added in 2000.

SCHBUS

SCHOOL BUS INVOLVED IN

• '0' = 'NOT SCHOOL BUS ACC'
• '1' = 'SCHOOL/ACTIVITY BUS ACC'

NOTE: Variable discontinued from 2000 onwards.

SEVERITY

WORST INJURY IN ACCIDENT

• '1' = 'FATAL INJURY'
• '2' = 'CLASS A INJURY'
• '3' = 'CALSS B INJURY'
• '4' = 'CLASS C INJURY'
• '5' = 'NO INJURY'
• '6' = 'UNKNOWN'

SPD_GRP

COMPUTED SPEED OF

• ' ' = '‑BLANK‑'
• '0' = 'NOT STATED'
• '1' = '00‑29 MPH'
• '2' = '30‑49 MPH'
• '3' = '50+ MPH'

NOTE: Variable discontinued from 2000 onwards.

TICKET1

CITATION ISSUED TO SOMEONE IN ACCIDENT

• ' ' = '-BLANK-'
• '0' = 'NO CITATION # IN ACC'
• '1' = 'CITATION # GIVEN'

NOTE: Variable discontinued from 2000 onwards. Almost 100% observations are coded as 0. Use this variable with caution.

TICKET2

CITATION ISSUED TO SOMEONE IN ACCIDENT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable added in 1998, and discontinued from 1999 onwards.

TIME

TIME OF DAY (24 HOUR)

• 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'

NOTE: Variable discontinued from 1999 onwards.

TO_DIR

DIRECTION TOWARD TO_RD

• 'E' = 'EAST'
• 'N' = 'NORTH'
• 'NE' = 'NORTH EAST'
• 'NW' = 'NORTH WEST'
• 'S' = 'SOUTH'
• 'SE' = 'SOUTH EAST'
• 'SW' = 'SOUTH WEST'
• 'W' = 'WEST'

NOTE: New variable added in 2000.

TO_RD

TOWARD ROAD

NON-LABELED VARIABLE -- See Raw File Documentation.

TORD_CL

TOWARD ROAD CLASS

• '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'

NOTE: New variable added in 2000.

TOT_KILL

TOTAL KILLED IN ACCIDENT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

TOTAINJ

TOTAL A INJURIES IN ACCIDENT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

TOTBINJ

TOTAL B INJURIES IN ACCIDENT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

TOTCINJ

TOTAL C INJURIES IN ACCIDENT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

TOWN_CD

DOT ASSIGNED TOWN CODE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

TRF_CNTL

TRAFFIC CONTROL TYPE

• 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.

TRF_OPER

TRAFFIC CONTROL

• 0 = 'NO'
• 1 = 'YES'
• 2 = 'UNKNOWN'
• 3 = 'NOT STATED' (Pre 2000)

TRF_VIS

TRAFFIC CONTROL VISIBLE

• '0' = 'NOT STATED'
• '1' = 'VISIBLE'
• '2' = 'NOT VISIBLE'

NOTE: Variable discontinued from 2000 onwards.

WEATHER1

WEATHER CONDITION 1

WEATHER2

WEATHER CONDITION 2 (From 2000 onwards)

• 0 = 'NOT STATED'
• 1 = 'CLEAR'
• 2 = 'CLOUDY'
• 3 = 'RAIN'
• 4 = 'SNOW'
• 5 = 'FOG, SMOG, SMOKE'
• 6 = 'SLEET, HAIL, FREEZING RAIN/DRIZZLE'
• 7* = 'SEVERE CROSSWINDS'
• 8* = 'BLOWING SAND, DIRT, SNOW'
• 9* = 'OTHER'

* Categories coded in 2000 and later years.

WEEKDAY

DAY OF WEEK

• '1' = 'MONDAY'
• '2' = 'TUESDAY'
• '3' = 'WEDNESDAY'
• '4' = 'THURSDAY'
• '5' = 'FRIDAY'
• '6' = 'SATURDAY'
• '7' = 'SUNDAY'

NOTE: Variable discontinued from 2000 onwards.

WETHCONT

WEATHER CONTRIBUTED TO ACCIDENT

• 0 = 'NO'
• 1 = 'YES'
• 2 = 'UNKNOWN'

NOTE: New variable added in 2000.

WORKZONE

WORK ZONE MARKED

• 1 = 'YES'
• 2 = 'NO'

NOTE: New variable added in 2000.

WZ_ACT

WORK ZONE ACTIVITY

• 1 = 'ON GOING'
• 2 = 'NO APPARENT ACTIVITY'

NOTE: New variable added in 2000.

WZ_AREA

WORK ZONE AREA

• 1 = 'CONSTRUCTION WORK AREA'
• 2 = 'MAINTENANCE WORK AREA'
• 3 = 'UTILITY WORK AREA'
• 4 = 'INTERMITTENT/MOVING WORK'
• 5 = 'NO'

NOTE: New variable added in 2000.

WZ_LOC

WORK ZONE CRASH LOCATION

• 1 = 'BEFORE WORK AREA'
• 2 = 'IN WORK AREA APPROACH TAPER'
• 3 = 'ADJACENT TO ACTUAL WORK AREA'

NOTE: New variable added in 2000.

Y_LINE

NON-MILEPOSTED CROSSING ROUTE LOCATION

• ' ' = '-BLANK-'
• '0' = 'NORMAL MILEPOST'
• '1' = 'Y-LINE MILEPOST'

NOTE: Variable discontinued from 2000 onwards.

ZIP_ADR

REPORTING OFFICER ZIP CODE

NON-LABELED VARIABLE -- See Raw File Documentation

NOTE: New variable added in 2000.

Vehicle Subfile

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE NORTH CAROLINA VEHICLE SUBFILE

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.

ACTION

DRIVER CHARGED WITH VIOL

• ' ','0' = 'NOT STATED'
• '1' = 'CHARGED WITH VIOLATION'
• '2' = 'NOT CHARGED'

NOTE: Variable discontinued from 2000 onwards.

AIRBAGS

AIR BAGS PRESENT IN VEH

• ' ' = '-BLANK-'
• '0' = 'UNKNOWN'
• '1' = 'AIR BAG PRESENT'
• '2' = 'NO AIR BAG'

NOTE: Variable discontinued from 2000 onwards.

AIRDEPL

AIRBAGS DEPLOYED DURING CRASH

• ' ' = '-BLANK-'
• '0' = 'UNKNOWN'
• '1' = 'AIR BAG DEPLOY'
• '2' = 'NOT DEPLOYED'

NOTE: (1) Variable discontinued from 2000 onwards.

(2) There is an increase in the number of observations coded as “Airbag Deployed”. This is because for later years, more vehicles were equipped with air bags.

ALC_DRUG

ALCOHOL/DRUG IN ACCIDENT

• 0 = 'NO'
• 1 = 'YES - ALCOHOL, IMPAIRMENT SUSPECTED'
• 2 = 'YES - ALCOHOL, NO IMPAIRMENT DETECTED'
• 3 = 'YES - OTHER DRUGS, IMPAIRMENT SUSPECTED'
• 4 = 'YES - OTHER DRUGS, NO IMPAIRMENT DETECTED'
• 5 = 'YES - ALCOHOL AND OTHER DRUGS, IMPAIRMENT SUSPECTED'
• 6 = 'YES - ALCOHOL AND OTHER DRUGS, NO IMPAIRMENT DETECTED'
• 7 = 'UNKNOWN'
• 8 = 'NOT STATE'
• 9 = 'DRINKING - UNABLE TO DETERMINE IMPAIRMENT'

NOTE: Variable discontinued from 2000 onwards.

ALCFLAG

ALCOHOL FLAG

• 'N' ='NO DRINK OR DRUG'
• 'Y' ='INTOXICATION CODE 2 OR 3'

NOTE: New variable added in 2000.

AMTDAMG

AMOUNT OF DAMAGE TO VEH

• 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'

AXLE_NBR

COMMERCIAL CARRIER NUMBER OF AXLES

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

AXLES

NUMBER OF AXLES FOR TRL#1

NON-LABELED VARIABLE -- See Raw File Documentation.

AXLES2

NUMBER OF AXLES FOR TRL#2

NON-LABELED VARIABLE -- See Raw File Documentation.

BIKEFLAG

BICYCLE FLAG

• 'N' = 'NOT BICYCLE ACC'
• 'Y' = 'BICYCLE ACC'

NOTE: New variable added in 2000.

BODY

CARGO BODY TYPE

• 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'

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

CASENO

NC ACCIDENT NUMBER WITH YR

NON-LABELED VARIABLE -- See Raw File Documentation.

Format YYNNNNNN Where YY=YEAR and NNNNNN=CASENUM.

NOTE: Variable type is CHAR for 1990 to 1999.

CC_CITY

COMMERCIAL CARRIER CITY

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

CC_STATE

COMMERCIAL CARRIER STATE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

CC_ZIP

COMMERCIAL CARRIER ZIP CODE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

CCB_CITY

COMMERCIAL CARRIER BUSINESS CITY

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

CCB_STAT

COMMERCIAL CARRIER CUSINESS STATE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

CDL_IND

CDL INDICATOR

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

CNT_SEAT

NUMBER OF SEATS

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

CONTRIB1

VIOL/CONTRIBUT FACTOR #1

CONTRIB2

VIOL/CONTRIBUT FACTOR #2

CONTRIB3

VIOL/CONTRIBUT FACTOR #3

CONTRIB4

VIOL/CONTRIBUT FACTOR #4

CONTRIB5

VIOL/CONTRIBUT FACTOR #5

• 00 = 'NO CONTRIBUTING CIRCUMSTANCES INDICATED'
• 01* = 'DISREGARDED YIELD SIGN'
• 02 = 'DISREGARDED STOP SIGN'
• 03* = 'DISREGARDED OTHER TRAFFIC SIGNS'
• 04 = 'DISREGARDED TRAFFIC SIGNALS'
• 05* = 'DISREGARDED ROAD MARKINGS'
• 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 CENTERLINE/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 coded for 1999 and earlier years.

NOTE: Variables CONTRIB4 and CONTRIB5 discontinued from 2000 onwards.

CROSSMED

CROSS MEDIAN

• ' ' = '-BLANK-'
• '0' = 'NOT STATED'
• '1' = 'CROSSED MEDIAN'
• '2' = 'MEDIAN NOT CROSSED'

NOTE: Variable discontinued from 2000 onwards.

DAMSEV

TAD#1 SEVERITY

DAMSEV2

TAD#2 SEVERITY

DAMSEV3

TAD#3 SEVERITY

• '0' ='NOT STATED'
• '1' ='LEAST SEVERE DAM #1'
• '2' ='SOME SEVERE DAM #2'
• '3' ='SOME SEVERE DAM #3'
• '4' ='SOME SEVERE DAM #4'
• '5' ='SEVERE DAM #5'
• '6' ='MORE SEVERE DAM #6'
• '7' ='MOST SEVERE DAM #7'
• '8' ='INVALID'

DIR_TRVL

DIRECT OF TRAVEL ON ROUTE

• 'E', '2' = 'EAST'
• 'N', '1' = 'NORTH'
• 'NE' = 'NORTH EAST'
• 'NW' = 'NORTH WEST'
• 'S', '3' = 'SOUTH'
• 'SE' = 'SOUTH EAST'
• 'SW' = 'SOUTH WEST'
• 'W', '4' = 'WEST'

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

DRG_RES

DRIVER ALCOHOL/DRUG TEST RESULT

• 0 = 'NO TEST'
• 1 = 'NO ALCOHOL OR OTHER DRUGS'
• 2 = 'ALCOHOL (PERCENT BAC)'
• 3 = 'OTHER DRUGS REPORTED'
• 4 = 'CONTAMINATED SAMPLE/UNUSABLE'
• 5 = 'PENDING'
• 6 = 'UNKNOWN'

NOTE: New variable added in 2000.

DRG_SUSP

DRIVER ALCOHOL/DRUG SUSPECTED

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

DRSTATE

OUT OF STATE DRIVERS

• ' ' = 'UNKNOWN'
• '0' = 'NC DRIVER LICENSE'
• '1' = 'OUT OF STATE DRIVER'

NOTE: Variable discontinued from 2000 onwards.

DRV_AGE

DRIVER/PEDEST AGE

• 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'

DRV_BAC

DRIVER BLOOD ALCOHOL PERCENTAGE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

DRV_CITY

DRIVER CITY

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

DRV_DOB

DRIVER DATE OF BIRTH

NON-LABELED VARIABLE -- See Raw File Documentation.

DRV_INJ

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' = 'UNKNOWN'

DRV_RACE

DRIVER/PEDEST RACE

• ' ' = '-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.

DRV_REST

DRIVER RESTRAINT

• ' ' = '-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.

NOTE: 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.

DRV_SEAT

DRIVER/PEDESTRIAN SEAT POS

• '1' = 'DRIVER'
• '2' = 'CENTER FRONT'
• '3' = 'RIGHT FRONT'
• '4' = 'LEFT REAR'
• '5' = 'CENTER REAR'
• '6' = 'RIGHT REAR'

DRV_SEX

DRIVER/PEDESTRIAN SEX

• ' ' = '-BLANK-'
• '0' = 'NOT STATED'
• '1' = 'MALE'
• '2' = 'FEMALE'
• '3' = 'NOT OCCUPIED'
• '4' = 'UNKNOWN'

DRV_ZIP

DRIVER ZIP CODE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

EMERGUSE

EMERGENCY VEHICLE USE

• 1 = 'FIRETRUCK'
• 2 = 'AMBULANCE'
• 3 = 'MILITARY'
• 4 = 'POLICE'
• 5 = 'OTHER'

NOTE: New variable added in 2000.

EVENT1

SEQUENCE OF EVENTS 1

EVENT2

SEQUENCE OF EVENTS 2

EVENT3

SEQUENCE OF EVENTS 3

EVENT4

SEQUENCE OF EVENTS 4

• 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 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 = '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 IN MEDIAN'
• 44 = 'GUARDRAIL FACE IN 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 = 'CONTRUCTION BARRIER'
• 63 = 'CRASH CUSHION'
• 64 = 'OTHER FIXED OBJECT'

NOTE: New variable added in 2000.

EXPR_DT

LICENSE EXPIRATION DATE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

FIRE

POSTCRASH FIRE

• '1' = 'YES'
• '2' = 'UNKNOWN'
• '3' = 'NOT STATED'

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

GOV_OWN

GOVERNMENT OWNED VEHICLE INDICATOR

• ' ' = 'UNCODED'
• 'Y' = 'YES'
• 'N' = 'NO'

NOTE: New variable added in 2000.

GVWR_WGT

COMMERCIAL CARRIER GROSS VEH WEIGHT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

HAZ_NUM1

1 DIGIT HAZMAT NUMBER BOTTOM PLACARD

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

HAZ_NUM4

4 DIGIT HAZMAT NUMBER BOTTOM PLACARD

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

HAZ_PLAC

HAZMAT PLACARD INDICATOR

• '1' = 'PRESENT'
• ' ' = 'NOT PRESENT'

NOTE: New variable added in 2000.

HAZMAT

HAZARDOUS CARGO

• ' ' = '-BLANK-'
• '0' = 'UNKNOWN'
• '1' = 'HAZARD MATERIAL'
• '2' = 'NO HAZARD MATERIAL'

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

IMPACTFT

DIST TRAVEL AFTER IMPACT

• 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 = 'DISTANCE N.S.'

IMPACTSP

IMPACT SPEED

• 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'

INSURED

INSURANCE INDICATOR

• ' ','0' = 'UNKNOWN'
• '1' = 'YES'
• '2' = 'NO'

NOTE: New variable added in 2000.

INTOXC

DRIVER INTOXICATION GROUP

• 1 = 'DRINKING'
• 2 = 'NOT DRINKING'
• 3 = 'UNKNOWN'

NOTE: Variable added in 1996, and discontinued from 1998 onwards.

L_PERMIT

LEARNER PERMIT

• '0',' ' = 'NO OR NOT STATED'
• '1' = 'LEARNER’S PERMIT'
• '2' = 'LIMITED PERMIT'

NOTE: Variable discontinued from 2000 onwards.

LENGTRL

LENGTH OF TRAILER #1,IN FT

NON-LABELED VARIABLE -- See Raw File Documentation.

LENGTRL2

LENGTH OF TRAILER #2,IN FT

NON-LABELED VARIABLE -- See Raw File Documentation.

LIC_IND

DRIVER LICENSE INDICATOR

• 'N' = 'NO'
• 'Y' = 'YES'

NOTE: New variable added in 2000.

LIC_STAT

LICENSE STATE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

LICRESTR

RESTRICT ON DRIVER LICENSE

• '‑' = '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, 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 RESTRICTN'

NOTE: (1) Variable discontinued from 2000 onwards.

(2) For years 1995 and 1996, all categories coded as missing.

LICTYPE

TYPE OF DRIVERS LICENSE

• '0' = 'HIT AND RUN'
• '1' = 'CLASS A--NC OPERATOR’S LICENSE'
• '2' = 'CLASS B--NC CHAUFFEUR’S LICENSE'
• '3' = 'CLASS C--NC OPERATOR’S AND CHAUFFEUR’S LICENSE'
• '4' = 'NC CONTROL NUMBER'
• '5' = 'NEW CONTROL NUMBER'
• '8' = 'LEARNER’S PERMIT'
• '9' = 'LIMITED PERMIT'

NOTE: From 2000 onwards all observations coded as missing.

For 1995 and 1996, all observations coded as 0.

MAKE

VEHICLE MAKE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable added in 1999, and discontinued from 2000 onwards.

MAKENAME

VEHICLE MAKE NAME

NON-LABELED VARIABLE -- See Raw File Documentation.

MANEUVER

VEH MANEUVER/PEDEST ACTION

• 01 = 'STOPPED IN TRAVEL LANE'
• 02 = 'PARKED OUT OF TRAVEL LANES'
• 03 = 'PARKED IN TRAVLE 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 STATE' (Pre 2000)

MISCACT1

MISCELLANEOUS ACTION

• ' ' = '-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' = 'VEH AND DRIVER INFO OMITTED'
• '13' = 'DRIVER INFO ADDED TO STATISTICAL REPORT ONLY'
• '14' = 'MOPED INFO ADDED TO STATISTICAL REPORT ONLY'

NOTE: Variable discontinued from 2000 onwards.

MOSTHARM

MOST HARMFUL EVENT

• 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 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 = '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 IN MEDIAN'
• 44 = 'GUARDRAIL FACE IN 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 = 'CONTRUCTION 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)

NOTE: (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 69) or other in 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.

NUM_A

TOTAL A INJURIES IN VEHICLE

NUM_B

TOTAL B INJURIES IN VEHICLE

NUM_C

TOTAL C INJURIES IN VEHICLE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variables discontinued from 2000 onwards.

NUM_K

TOTAL KILLED IN VEHICLE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

NUM_OCCS

TOTAL OCCUPANTS IN VEHICLE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

NUM_POCS

NUMBER OF POINTS OF CONTACT

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

NUM_TADS

NUMBER OF TAD CODES

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

NUMINJ

TOTAL INJURED IN VEHICLE (K+A+B+C)

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

NUMVIOLS

NUMBER OF VIOLATIONS INDICATED

• '00' = 'NO VIOLATIONS'
• '01' = '1 CONTRIB/VIOL'
• '02' = '2 CONTRIB/VIOLS'
• '03' = '3 CONTRIB/VIOLS'
• '04' = '4 CONTRIB/VIOLS'
• '05'‑'99' = '5+ CONTRIB/VIOL'

NOTE: Variable discontinued from 2000 onwards.

OBJECT1

TYPE OF OBJECT STRUCK

• ' ' = '-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 FACE ON SHOULDER'
• '15' = 'GUARDRAIL END IN MEDIAN'
• '16' = 'GUARDRAIL FACE 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 IN MEDIAN'
• '30' = 'DITCH BANK'
• '31' = 'MAILBOX'
• '32' = 'FENCE OR FENCE POST'
• '33' = 'CONSTRUCTION BARRIER'
• '34' = 'CRASH CUSHION'
• '35' = 'OTHER OBJECT'

NOTE: Variable discontinued from 2000 onwards.

ON_RD

ON ROAD

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

ONRD_CL

ON ROAD CLASS

• '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'

NOTE: New variable added in 2000.

OTH_UNIT

OTHER UNIT TYPE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

OUTSTATE

OUT OF STATE VEH REGIS

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

OWN_CITY

VEHICLE OWNER CITY

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

OWN_STAT

VEHICLE OWNER STATE

NOTE: New variable added in 2000.

OWN_ZIP

VEHICLE OWNER ZIP CODE

NOTE: New variable added in 2000.

OWNERTYP

OWNER CATEGORY

• '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)

NOTE: Variable format changed from 2000 onwards.

PARK_VEH

INDICATOR OF PARKED VEHICLE

• ' ' = 'TRAELING'
• '1' = 'PARKED'

NOTE: New variable added in 2000.

PED_LOC

NON-MOTORIST LOCATION PRIOR TO CRASH

• 01 = 'MARKED CROSSWALK AT INTERSECTION'
• 02 = 'AT INTERSECTION BUT NO CROSSWALK'
• 03 = 'NON-INTERSECTINO CROSSWALK'
• 04 = 'DRIVEWAY ACCESS CROSSWALK'
• 05 = 'IN ROADWAY'
• 06 = 'NOT IN ROADWAY'
• 07 = 'MEDIAN'
• 08 = 'ISLAND'
• 09 = 'SHOULDER'
• 10 = 'SIDEWALK'
• 11 = 'WITHIN 10 FEET OR ROADWAY'
• 12 = 'BEYOND 10 FEET OF ROADWAY'
• 13 = 'OUTSIDE TRAFFICWAY'
• 14 = 'SHARED-USE PATH OR TRAILS'

NOTE: New variable added in 2000.

PEDACT

NON-MOTORIST ACTION

• 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'

NOTE: 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.

PEDCONT1

CONTRIBUTING CIRCUMSTANCES, NON-MOTORIST 1

PEDCONT2

CONTRIBUTING CIRCUMSTANCES, NON-MOTORIST 2

• 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'

NOTE: New variable added in 2000.

PEDFLAG

PEDESTRIAN IN ACCIDENT

• 'N' = 'NOT PEDESTRIAN ACCIDENT'
• 'Y' = 'PEDESTRIAN ACCIDENT'

NOTE: New variable added in 2000.

PEDHITBY

PUPIL PEDESTRIAN STRUCK BY (SCHLBUS CRASH)

• ' ' = '-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'

NOTE: Variable discontinued from 2000 onwards. Almost all observations are coded as missing.

PHYSCOND

PHYSICAL CONDITION OF DRIVER

• 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 STATE' (Pre 2000)

PTCONT1

POINT OF CONTACT #1

PTCONT2

POINT OF CONTACT #2

PTCONT3

POINT OF CONTACT #3

PTCONT4

POINT OF CONTACT #4

PTCONT5

POINT OF CONTACT #5

• ' ' = '-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, CAB'
• '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' = 'UNDRNEATH CENTER'
• '24' = 'UNDERNEATH REAR'
• '25' = 'ROLLOVER'
• '26' = 'UNKNOWN'
• '27' = 'FRONT, 2-WHL VEH'
• '28' = 'LEFT, 2-WHEEL VEH'
• '29' = 'REAR, 2-WHEEL 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 TRLR'
• '41' = 'FRONT END-DISTR'
• '42' = 'LEFT SIDE-DISTR'
• '43' = 'REAR END-DISTR'
• '44' = 'RIGHT SIDE DISTR'

RD2OBJST

DISTANCE TO OBJECT STRUCK

• 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

REGION OF IMPACT

• ' ' = '-BLANK-'
• '1' = 'FRONT IMPACT'
• '2' = 'RIGHT SIDE IMPACT'
• '3' = 'LEFT SIDE IMPACT'
• '4' = 'REAR END IMPACT'
• '5' = 'UNSPECIFIED'

NOTE: Variable discontinued from 2000 onwards.

ROLLOVER

VEHICLE ROLLOVER

• ' ' = 'UNKNOWN'
• '0' = 'ROLLED OVER'
• '1' = 'NO ROLLOVER'

NOTE: Variable discontinued from 2000 onwards.

ROLLPTCT

VEHICLE ROLLOVER - DETERMINED BY USING POINT OF CONTACT

• 1 = 'ROLLED OVER'
• 2 = 'NO ROLLOVER'

NOTE: Variable added in 1996, and discontinued from 1998 onwards.

ROLLTAD

VEHICLE ROLLOVER - DETERMINED BY USING TAD SEVERITY

• 1 = 'ROLLED OVER'
• 2 = 'NO ROLLOVER'

NOTE: Variable added in 1996, and discontinued from 1998 onwards.

SCH_BUS1

SCHOOL BUS CONTACT VEHICLE

• 1 = 'YES'
• 0 = 'NO'

NOTE: New variable added in 2000.

SCH_BUS2

SCHOOL BUS NON-CONTACT VEHICLE

• 1 = 'YES'
• 0 = 'NO'

NOTE: New variable added in 2000.

SOB_TEST

CHEMICAL TEST GIVEN

• 0 = 'NO TEST'
• 1 = 'ALCOHOL TEST'
• 2 = 'TEST FOR OTHER DRUGS'
• 3 = 'ALCOHOL AND OTHER DRUGS TEST'
• 4 = 'TEST REFUSED'
• 5 = 'UNKNOWN'
• 6 = 'NOT STATE'
• 7 = 'TESTED'

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

SPDLIM

POSTED SPEED LIMIT

• 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'

SPILL

HAZARDOUS CARGO SPILL

• ' ' = '-BLANK-'
• '0' = 'NOT STATED'
• '1' = 'HAZARDOUS SPILL'
• '2' = 'NO SPILL'

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

TIRESKID

TIRE IMPRESSIONS 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 IMPRSN N.S.'

TOTLENG

TOTAL LENGTH OF TRAILER (S)(FT)

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

TOWAWAY

VEHICLE DRIVEABLE

• 1 = 'YES'
• 2 = 'UNKNOWN'
• 3 = 'NOT STATED'

TOWED_BY

TOWED BY

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

TOWED_TO

TOWED TO

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

TRL_TYPE

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'

TRL1_FLG

DATA PRESENT (TRAILER #1)

TRL2_FLG

DATA PRESENT (TRAILER #2)

• '0' ='NO TRAILER DIMENSION AVAILABLE'
• '1' ='DIMENSIONS GIVEN'
• OTHER = 'ERROR / OTHER Code'

NOTE: Variable discontinued from 2000 onwards.

TRVL_SPD

ESTIMATED ORIGINAL SPEED

• 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'

UNDEROVR

VEHICLE UNDERRIDE/OVERRIDE

• 1 = 'UNDERRIDE'
• 2 = 'OVERRIDE'
• 3 = 'NEITHER UNDERRIDE OR OVERRIDE'
• 4 = 'UNKNOWN'

NOTE: New variable added in 2000.

UNIT_TYP

UNIT TYPE

• ' ' = '-BLANK-'
• '0' = 'UNKNOWN'
• '2' = 'NOT COMM VEH'
• 'C' = 'COMMERCIAL'
• 'H' = 'HIT AND RUN'
• 'O' = 'OTHER'
• 'P' = 'PEDESTRIAN'
• 'V' = 'VEHICLE'

NOTE: 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.

V_DAMAGE

TAD#1 (AREA OF DAMAGE) LOC

V_DAMAG2

TAD#2 LOCATION

V_DAMAG3

TAD#3 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' = 'BL'
• '14' = 'L AND T'
• '15' = 'LBQ'
• '16' = 'LD, LSS'
• '17' = 'LP'
• '18' = 'LFQ'
• '19' = 'TOP'
• '20' = 'UNDECODEABLE'

VEH_SEIZ

VEHICLE SEIZURE DWI

• 1 = 'YES'
• 2 = 'UNKNOWN'

NOTE: New variable added in 2000.

VEHCOND1

VEHICLE DEFECT

• '0' = 'NOT STATED'
• '1' = 'DEFECTIVE BRAKES'
• '2' = 'DEFECTIVE HEADLGHTS'
• '3' = 'DEFECTIVE REAR LIGHTS'
• '4' = 'DEFECTIVE STEERING'
• '5' = 'DEFECTIVE TIRES'
• '6' = 'OTHER DEFECTS'
• '7' = 'UNKNOWN'
• '8' = 'NO DEFECTS'

NOTE: Variable discontinued from 2000 onwards.

VEHNO

VEHICLE POSITION NUMBER

NON-LABELED VARIABLE -- See Raw File Documentation.

VEHON

VEHICLE LOCATION BASED ON ROAD

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

VEHSEV

SEVERITY

• 1 = 'NO INJURY'
• 2 = 'CLASS C INJURY'
• 3 = 'CLASS B INJURY'
• 4 = 'CLASS A INJURY'
• 5 = 'FATAL INJURY'

NOTE: Variable added in 1996, and discontinued from 1998 onwards.

VEHTYPE

VEHICLE TYPE

• 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 OR MORE AXLES)'
• 12 = 'TRUCK/TRAILER'
• 13 = 'TRUCK/TRACTOR'
• 14* = 'TRACTOR/SEMI-TRAILER'
• 15* = 'TRACTOR/DOULBES'
• 16* = 'UNKNOWN HEAVY TRUCK'
• 17 = 'TAXICAB'
• 18 = 'FARM EQUIPMENT'
• 19 = 'FARM TRACTOR'
• 20 = 'MOTORCYCLE'
• 21 = 'MOPED'
• 22 = 'MOTOR SCOOTER OR MOTOR BIKE'
• 23 = 'PEDALCYCLE'
• 24 = 'PEDESTRIAN'
• 25 = 'MOTOR HOME/RECREATIONAL VEHICLE'
• 26 = 'OTHER'
• 27* = 'ALL TERRAIN VEHICLE (ATV)'
• 28* = 'FIRETRUCK'
• 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.

NOTE: Coding for two-axle trucks changed between 1991 and 1992, when new codes were added. (See Discussion.)

VEHYR

MODEL YEAR OF VEHICLE

NON-LABELED VARIABLE -- See Raw File Documentation.

Format YYYY Where YYYY=Year.

VIN

VEHICLE IDENTIFICATION NO

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: Variable discontinued from 2000 onwards.

VIN_ID

VIN IDENTIFICATION NUMBER

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

VISION

VISION OBSTRUCTION

• 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)

WIDTRL

WIDTH OF TRAILER #1 (INCHES)

NON-LABELED VARIABLE -- See Raw File Documentation.

WIDTRL2

WIDTH OF TRAILER #2 (INCHES)

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 1996.

Occupant Subfile

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE NORTH CAROLINA OCCUPANT SUBFILE

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 Occupant Subfile as well as in the Vehicle Subfile.

AGE

OCCUPANT AGE

• 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 = '66 ‑ 75 YRS'
• 76‑85 = '76 ‑ 85 YRS'
• 86‑97 = '86+ YRS'
• 98 = 'NOT OCCUPIED'
• 99 = 'NOT STATED'

AIR_SW

AIRBAG SWITCH STATUS

• 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'

NOTE: New variable added in 2000.

AIRDEPL

AIRBAG DEPLOYED

• ' ' = '-BLANK-'
• '0' = 'UNKNOWN'
• '1' = 'AIR BAG DEPLOY'
• '2' = 'NOT DEPLOYED'

NOTE: New variable added in 2000.

CASENO

NC ACCIDENT NUMBER WITH YEAR

NON-LABELED VARIABLE -- Format YYNNNNNN Where YY=YEAR and NNNNNN=CASENUM.

NOTE: Variable type is CHAR for 1990 to 1999.

EJECT

EJECTION

• 1 = 'NOT EJECTED'
• 2 = 'TOTALLY EJECTED'
• 3 = 'PARTIALLY EJECTED'
• 4 = 'UNKNOWN'

NOTE: New variable added in 2000.

EMS_DES

EMERGENCY MEDICAL SERVICE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

INJ

OCCUPANT INJURY

• 1 = 'K KILLED'
• 2 = 'A TYPE INJURY (DISABLING)'
• 3 = 'B TYPE INJURY (EVIDENT)'
• 4 = 'C TYPE INJURY (POSSIBLE)'
• 5 = 'O NO INJURY'
• 6 = 'N UNKNOWN'
• 7 = 'NOT STATED' (Pre 2000)
• 8 = 'NOT OCCUPIED' (Pre 2000)

PRSN_CTY

PERSON CITY

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

PRSN_DOB

PERSON DATE OF BIRTH

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

PRSN_NBR

PERSON NUMBER

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

PRSN_ST

PERSON STATE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

PRSN_TYP

PERSON TYPE

• 1 = 'DRIVER'
• 2 = 'PASSENGER'
• 3 = 'PEDESTRIAN'
• 4 = 'PEDALCYCLIST'
• 5 = 'ROLLER SKATER, ROLLER BLADER, ETC.'
• 6 = 'OTHER'
• 7 = 'UNKNOWN'

NOTE: New variable added in 2000.

PRSN_ZIP

PERSON ZIP CODE

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

RACE

OCCUPANT RACE

• 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)

REST1

OCCUPANT RESTRAINT

• 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)

SEATPOS

SEATING POSITION

• 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 UNENLOSED AREA'
• 13 = 'TRAILING UNIT'
• 14 = 'RIDING ON VEHICLE EXTERIOR'
• 15 = 'UNKNOWN'

SEX

OCCUPANT SEX

• 1 = 'MALE'
• 2 = 'FEMALE'
• 3 = 'UNKNOWN'
• 4 = 'NOT STATED' (Pre 2000)
• 5 = 'NOT OCCUPIED' (Pre 2000)

TRAPPED

TRAPPED

• 0 = 'NO'
• 1 = 'YES'
• 2 = 'UNKNOWN'

NOTE: New variable added in 2000.

TRT_FAC

TREATMENT FACILITY NAME

NON-LABELED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 2000.

VEHNO

VEHICLE POSITION NUMBER

NON-LABELED VARIABLE -- 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.

NOTE: This information was copied from the North Carolina Vehicle Subfile variable named VEHNO.

Roadway Inventory File

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE NORTH CAROLINA ROADWAY INVENTORY FILE

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

AADT

AVER ANNUAL DAILY TRAFFIC

• 00000 = 'UNKNOWN'
• 00001‑00100 = ' 0‑ 100'
• 00101‑00500 = ' 101‑ 500'
• 00501‑01000 = ' 501‑ 1,000'
• 01001‑02000 = ' 1,001‑ 2,000'
• 02001‑05000 = ' 2,001‑ 5,000'
• 05001‑10000 = ' 5,001‑10,000'
• 10001‑15000 = '10,000‑15,000'
• 15001‑20000 = '15,001‑20,000'
• 20001‑40000 = '20,001‑40,000'
• 40001‑999999 = '40,000+'

AADT_YR

YEAR OF ADT

NON-LABELED VARIABLE -- See Raw File Documentation.

Format YY Where YY=Year.

ACCESS

ACCESS CONTROL

• '1' = 'NO ACCESS CONTROL'
• '2' = 'PARTIAL CONTROL'
• '3' = 'FULL CONTROL'

ARAETYPE

AREA TYPE

• '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 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'

BEGMP

BEGIN MILEPOST

NON-LABELED VARIABLE -- See Raw File Documentation.

CNTYRTE

COUNTY ROUTE NUMBER

NON-LABELED VARIABLE -- See Raw File Documentation.

COUNTY

COUNTY

• '00' = 'ALAMANCE'
• '01' = 'ALEXANDER'
• '02' = 'ALLEGHANY'
• '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' = 'LENIOR'
• '54' = 'LINCOLN'
• '55' = 'MACON'
• '56' = 'MADISON'
• '57' = 'MARTIN'
• '58' = 'MCDOWELL'
• '59' = 'MECKLENBERG'
• '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' = 'TYRRELL'
• '89' = 'UNION'
• '90' = 'VANCE'
• '91' = 'WAKE'
• '92' = 'WARREN'
• '93' = 'WASHINGTON'
• '94' = 'WATAUGA'
• '95' = 'WAYNE'
• '96' = 'WILKES'
• '97' = 'WILSON'
• '98' = 'YADKIN'
• '99' = 'YANCEY'

DESC_

ROADWAY DESCRIPTION

NON-LABELLED VARIABLE -- See Raw File Documentation.

DHRVOL

DESIGN HOUR VOLUME

NON-LABELLED VARIABLE -- See Raw File Documentation.

DIV

HOGHWAY DIVISION

NON-LABELLED VARIABLE -- See Raw File Documentation.

ENDMP

ENDING MILEPOST

NON-LABELED VARIABLE -- See Raw File Documentation.

FUNC_CLS

FUNCTIONAL CLASS

• '01' = 'RURAL PRINCIPAL 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' = 'URBAL MINOR ARTERIAL'
• '13' = 'URBAN COLLECTOR'
• '14' = 'URBAN LOCAL'

FUNC_ST

FUNCTIONAL CLASS PROVIDED BY THE STATE

NOTE: Variable for internal use. Use the variable FUNC_CLS to capture the Information about FUNCTIONAL CLASS.

HPMS1

HPMS SAMPLE ID

NON-LABELED VARIABLE -- See Raw File Documentation.

IMPROVE1

TYPE OF RECENT IMPROVEMENT

• 'NL'='RELOCATION'
• 'NR'='NEW CONST'
• 'NE'='NEW CONST-HPMS'
• 'RF'='RECONST OF FRWY'
• 'RL'='RECONST W/ MORE LN'
• 'RW'='RECONST TO WD LN'
• 'RP'='PVMT RECONST'
• 'RI'='ISO RECONST'
• 'MA'='MAJ WIDENING'
• 'MI'='MIN WIDENING'
• 'CS'='CONC. RESURF WITH SHLD IMP'
• 'BS'='BITM. RESURF WITH SHLD IMP'
• 'RC'='CONCRETE RESURFACING'
• 'RB'='BITM RESURFACING'
• 'IP'='INITIAL PAVING'
• '00'-'41'='SURF TYP CHANGE'
• 'RE'='RESTORATION AND REHAB'
• 'BR'='BRIDGE REPLACEMENT'
• 'BH'='MAJ BRIDGE REHAB'
• 'BM'='MIN BRIDGE REHAB'
• 'ST'='SAFETY/TRAFFIC OPER'
• 'OT'='ENVIRONMENTALLY RELATED'

INTSTMP

INTERSTATE MILEPOST

NON-LABELLED VARIABLE -- See Raw File Documentation.

INV_CNTL

INVENTORY CONTROL

• '1' = 'BOTH DIRECTIONS'
• '2' = 'NORTHBOUND ONLY'
• '3' = 'SOUTHBOUND ONLY'
• '4' = 'EASTBOUND ONLY'
• '5' = 'WESTBOUND ONLY'
• '6' = 'COMMON RECORD'
• '7' = 'GAP RECORD'

LISTCNTL

LIST CONTROL

• '1' = 'NORMAL LISTING SEQUENCE'
• '2' = 'INFORMATION LISTED AT THE END OF ROUTE'
• '3' = 'ADDITIONAL GROUP LISTED AT THE END OF ROUTE'

LSHL_TYP

LEFT SHOULDER TYPE

• ' ' = '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'

NOTE: This variable 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.

LSHLDWID

LEFT SHOULDER WIDTH

• 0 = 'UNKNOWN'
• 1‑3 = '1‑3 FEET'
• 4‑6 = '4‑6 FEET'
• 7‑9 = '7‑9 FEET'
• 10‑13 = '10‑13 FEET'
• 14‑25 = '14+ FEET'
• 26 = 'NO PARKING'
• 27 = 'PARALLEL PARKING'
• 28 = 'ANGLE PARKING'

LT_PARK

PEAK PARKING LEFT

• 'A' = 'AM'
• 'N' = 'NOON'
• 'P' = 'PM'

MED_TYPE

MEDIAN TYPE

• '1' = 'UNDIVIDED ROADWAY'
• '2' = 'CONTINUOUS TURN LANE'
• '3' = 'PAVED MOUNTABLE'
• '4' = 'CURB'
• '5' = 'GRASS'
• '6' = 'POSITIVE BARRIER'
• '7' = 'PARKLAND, BUSINESS'
• '8' = 'COUPLET'

MEDWID

MEDIAN WIDTH – TOTAL

• 000 = 'ZERO FEET'
• 1‑10 = ' 1 ‑ 10 FEET'
• 11‑20 = '11 ‑ 20 FEET'
• 21‑30 = '21 ‑ 30 FEET'
• 31‑40 = '31 ‑ 40 FEET'
• 41‑50 = '41 ‑ 50 FEET'
• 51‑60 = '51 ‑ 60 FEET'
• 61‑90 = '61 ‑ 90 FEET'
• 91‑99 = '91+ FEET'
• 100 = 'UNKNOWN OR N.A.'
• 101 = 'COUPLET ‑ 1 WAY'
• 102 = 'COUPLET ‑ 2 WAY'

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

MVMT

MILLION VEHICLE MILES TRAVELLED

NON-LABELLED VARIABLE -- Million Vehicle Miles traveled.

NHS

NATIONAL HIGHWAY SYSTEM

• '0' = 'NOT NHS SECTION'
• '2' = 'NHS SECTION'

NOTE: New variable added in 1993.

NO_LANES

NUMBER OF LANES--TOTAL

• '0' = 'UNKNOWN'
• '1' = 'ONE 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'

PAVECOND

PAVEMENT CONDITION

NON-LABELLED VARIABLE -- See Raw File Documentation.

PCT_TRK1

TOTAL PERCENT TRUCKS

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

NOTE: Here, 88.9 percent of the section mileage is coded as "unknown" for years prior to 2000. From 2000 onwards, this variable is sufficiently populated. Truck percentages are only assigned when there is some confidence in the percent given -- i.e., when a classification count is available on that, or a nearby, section.

PEAK_TRK

PERCENT TRUCKS AT PEAK

• '0' = 'UNKNOWN'
• '1' = 'UNDER 5 %'
• '2' = '5 % ‑ 9.99 %'
• '3' = '10% AND OVER'

NOTE: This variable is coded as "unknown" in 59.7% of the cases. Truck percentages are only assigned when there is some confidence in the percent given -- i.e., when a classification count is available on that, or a nearby, section.

POP_GRP

POPULATION GROUP

• '0' = 'UNINCORP + RURAL'
• '1' = 'UNDER 1000 POP'
• '2' = '1000 ‑ 2499'
• '3' = '2500 ‑ 4999'
• '4' = '5000 ‑ 9999'
• '5' = '10,000 ‑ 24,999'
• '6' = '25,000 ‑ 49,999'
• '7' = '50,000 ‑ 99,999'
• '8' = '100,000 PLUS'

NOTE: Categories are defined by size of incorporated area. (See RURURB, URB_POP and Discussion.)

PTCSTAT

PORTABLE TRAFFIC COUNTER

NON-LABELLED VARIABLE -- See Raw File Documentation.

RECCONT

RECORD CONTINUATION CODE

NOTE: New variable added in 1999.

RODWYCLS

ROADWAY CLASS

• '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'

NOTE: 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 rural 2-lane and others. See discussion.

ROUGH

PAVEMENT ROUGHNESS

NON-LABELLED VARIABLE -- See Raw File Documentation.

ROW

RIGHT OF WAY

NON-LABELLED VARIABLE -- See Raw File Documentation.

RSHL_TYP

RIGHT SHOULDER TYPE

• ' ' = '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'

NOTE: Approximately 3 to 5 percent of the mileage is coded as unknown."

RSHLDWID

RIGHT SHOULDER WIDTH

• 1‑3 = '1‑3 FEET'
• 4‑6 = '4‑6 FEET'
• 7‑9 = '7‑9 FEET'
• 10‑13 = '10‑13 FEET'
• 14‑25 = '14+ FEET'
• 26 = 'NO PARKING'
• 27 = 'PARALLEL PARKING'
• 28 = 'ANGLE PARKING'

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

RT_PARK

PEAK PARKING RIGHT

• 'A' = 'AM'
• 'N' = 'NOON'
• 'P' = 'PM'

RTE_NBR

ROUTE INVENTORIED

NON-LABELED VARIABLE -- See Raw File Documentation.

RTE_TYPE

ROUTE TYPE (1ST DIGIT OF RTE_NBR)

• '1' = 'INTERSTATE'
• '2' = 'US ROUTE'
• '3' = 'NC ROUTE'
• '4' = 'SECONDARY'

RULURBID

RURAL URBAN IDENTIFICATION

NON-LABELLED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 1992.

SCENIC

SCENIC BYWAY

NON-LABELLED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 1999 and discontinued from 2002 onwards.

SEG_LNG

SECTION LENGTH IN MILES

NON-LABELED VARIABLE -- See Raw File Documentation.

SIGHTDIS

SIGHT DISTANCE

NON-LABELED VARIABLE -- See Raw File Documentation.

SPD_LIMT

SPEED LIMIT

NON-LABELED VARIABLE -- See Raw File Documentation.

SPEC_SYS

SPECIAL SYSTEM

• BLANK = 'UNKNOWN OR STATE PARK, FOREST, RECREATIONAL AREA ROAD'
• '0' = 'APPALACHIAN HIGHWAY ACCESS ROAD'
• '1' = 'NATIONAL FOREST HIGHWAY SYSTEM ROAD'
• '2' = 'NATIONAL FOREST DEVELOPMENT ROAD'
• '3' = 'BLUE RIDGE PARKWAY'
• '4' = 'NATIONAL PARK, SEA SHORE, RECREATIONAL MONUMENT, HISTORIC AREA'
• '5' = 'CHEROKEE INDIAN RESERVATION ROAD'
• '6' = 'PRIORITY PRIMARY HIGHWAYS'
• '7' = 'MILITARY RESERVATION ROAD'
• '8' = 'NATIONAL WILDLIFE REFUGE ROAD'
• '9,G,H,J' = 'ADDITION TO INTERSTATE SYSTEM, 123 USC 139'
• 'K','A','B','C','D','E','F','N','S' = 'APPALACHIAN DEVELOPMENT HIGHWAY – VARIOUS CLASSIFICATION'

STATE_SY

STATE HIGHWAY SYSTEM

NON-LABELLED VARIABLE -- See Raw File Documentation.

SURF_TYP

SURFACE TYPE

• '00' = '00‑PRIMITIVE (NOT USED ON 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'

SURF_WID

SURFACE WIDTH ‑ TOTAL

NON–LABELED VARIABLE –- See Raw File Documentation.

TERRAIN

TERRAIN

• '1' = 'FLAT'
• '2' = 'ROLLING'
• '3' = 'MOUNTAINOUS'

TOWN

TOWN

NON–LABELED VARIABLE –- See Raw File Documentation.

TRFGROW

TRAFFIC GROWTH FACTOR

NON-LABELED VARIABLE -- See Raw File Documentation.

TRK_RTE

DESIGNATED TRUCK ROUTE

• '1' = 'NOT A TRUCK ROUTE'
• '2' = 'PARKWAY‑NO TRUCK ALLOWED'
• '3' = 'TRUCKS PROHIBITED'
• '4' = 'TRUCKS LIMITED'
• '5' = 'TRUCK ROUTE'

TRNLNWD

TURN LANE WIDTH

NON-LABELLED VARIABLE -- See Raw File Documentation.

NOTE: New variable added in 1992.

UPDATE_

UPDATE

NON–LABELED VARIABLE –- See Raw File Documentation.

Format MM/DD/YY where MM=MONTH, DD=DAY and YY=YEAR.

NOTE: New variable added in 1999.

URB_LOC

URBAN LOCATION

NON–LABELED VARIABLE –- See Raw File Documentation.

NOTE: Variable discontinued from 2002 onwards.

URB_POP

RURAL/URBAN DESIGNATED BY POPULATION

• '0' = 'UNINCORPORATED'
• '1' = 'RURAL INCORPORATED <2500'
• '2' = 'RURAL INCORPORATED <5000'
• '3' = 'URBAN <25,000'
• '4' = 'URBAN <50,000'
• '5' = 'CITY <100,000'
• '6' = 'CITY <200,000'
• '7' = 'CITY <500,000'

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

WTDSGSPD

WEIGHTED DESIGN SPEED

NON-LABELLED VARIABLE -- Calculated value based on degree and lengths of curves of tangents in the HPMS sample section.

YEAR

YEAR OF TRAFFIC COUNT

NON–LABELED VARIABLE –- See Raw File Documentation.

Format YYYY Where YYYY=Year.

NOTE: New variable added in 1999.

YR_IMPR1

YEAR OF RECENT IMPROVEMENT

NON-LABELED VARIABLE -- See Raw File Documentation.

YRADD

YEAR ADDED

NON-LABELED VARIABLE –- See Raw File Documentation.