HIGHWAY SAFETY INFORMATION SYSTEM GUIDEBOOK FOR THE ILLINOIS STATE DATA FILES

SAS File Formats

Prepared by

Forrest M. Council
University of North Carolina
Highway Safety Research Center
730 Airport Road
Chapel Hill, NC 27599-3430

Yusuf M. Mohamedshah
LENDIS Corporation
Turner Fairbank Highway Research Center
Federal Highway Administration
6300 Georgetown Pike
McLean, VA 22101-2296

Prepared for

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

Revised, April 2009

TABLE OF CONTENTS

• INTRODUCTION
• DETAILS OF MAJOR FILES
  • The Accident Files
  • The VIN File
  • The Roadlog File
  • Traffic Data
  • The Intersection-Location Subfile
  • The “Deficient” Horizontal Curve Files
  • Issues Related to Merging Files
• ILLINOIS CONTACTS
• COMPOSITE LIST OF VARIABLES
• ACCIDENT FILE
  • ACCIDENT SUBFILE
  • VEHICLE SUBFILE
  • INJURED OCCUPANTS SUBFILE
• ROADLOG FILE
• DEFICIENT CURVE FILE

INTRODUCTION

(NOTE:  Changes from the previous edition of the Guidebook are shown in bold and italic.)

The Illinois data system includes the following basic files:

• Accident data
• Roadlog File
• Bridge (Structures) File
• RR Grade Crossing File

The first two of these files are currently being captured in the HSIS.  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 is available at FHWA offices. The conversion programs developed by HSRC and LENDIS to convert the files into SQL and SAS formats are included in the Programmer’s Guidebook, which is available at the HSIS offices at FHWA.

Beginning in 2004, the HSIS system was converted from SYBASE relational database to ORACLE relational database for internal use. This ORACLE database stores the data received from Illinois and other States, and the data files for a given State are linked and manipulated using SAS code.  However, this conversion from the original SAS-based system to the ORACLE 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.

It is noted at this point that the "raw files" received from Illinois are less "raw" than in other States since the data do not come directly from police accident report forms or from basic roadway inventory files.  Instead, Illinois has developed their own safety information system, which includes a number of data edits and quality checks.  The "raw" files that we are receiving for HSIS are those files that have already undergone this series of checks and edits.

As noted above, the SAS accident data is in three separate subfiles, the first containing the basic accident information on a case-by-case basis, and then separate files containing information on vehicles and occupants in each accident case.  In the 1985-91 files, the Occupant subfile only includes data on injured occupants. From 1992 onwards, the occupant subfile contains both injured and uninjured occupants.  The vehicle and injured-occupant data can be linked to the basic accident data for specific cases using the accident report number and vehicle number.  The accident subfile can be linked to the Roadlog file using three common variables -- county, route, and milepost.

Unlike an Accident File record that is referenced to a point on the roadway, each record on the Roadlog File contains information on a homogeneous section of roadway (i.e., a stretch of road which is consistent in terms of certain characteristics), with each new section being defined by a new beginning reference point.  Each record on this Roadlog File contains current characteristics of the road system including surface type and width, shoulder and median information, lane information, etc.

Due to established priorities of effort, HSRC staff did not work with the Bridge File or the Railroad Grade-Crossing File.  As is the case with most States, the Bridge File data contains information on bridge structures across the State.  The data is considered quite accurate since it is based on the Federal bridge inventory.  In a similar fashion, the Railroad Grade Crossing File is a file containing information on all grade-crossings in the State, and is prepared and maintained according to FHWA requirements.

Details of the three Accident subfiles and the Roadlog file are presented in the following section.

DETAILS OF MAJOR FILES

The Accident Files

All police departments collect the accident data statewide on a standard form.  Prior to 1992, crashes were reported if they involved personal injury or total property damage of $250 or more.  The property damage threshold increased to $500 on January 1, 1992.  The form is sent to the Division of Traffic Safety where coders/editors first match motorist reports with police reports, then look up a location code from a series of maps and "locate" each crash, and then code the basic accident data into the files. (The location code also triggers a computer table "look-up" which allows Illinois to attach a variable related to the Federal functional class to the accident data.  In other States, such a variable would only be found on the roadway inventory file since the investigating officer would not be able to distinguish the various system types.)

The Illinois accident report form changed significantly in 1993.  This new "self-coding" form resulted in new variables, changes in codes for existing variables, and changes in the manner in which the data is processed.  As expected, the data for the "transition year" (i.e., 1993) are perhaps not as accurate as the data for other years.  However, Illinois staff has conducted extensive data edits and recodes to correct as many problems as possible.  In most cases, the data received by HSIS were recoded to "old formats" by Illinois for the 1993 file.  However, additional codes were added at times.  In 1994, new codes will be used by Illinois.  To continue to allow use of multiple years of data, HSIS staff has modified the new Illinois codes such that they can be integrated with the old HSIS codes.  These changes are noted in the SAS format sections that follow.

Approximately 400,000 accidents per year are reported in Illinois.  The HSIS data set contains the subset of 1985-2007 accidents that occurred on the State-inventoried system.  Almost all of these accidents can be linked with the Roadlog file.  This data set includes between 105,000 and 205,000 accidents per year over the twenty two-year range and between 205,000 and 380,000 vehicles records per year for the same range. There are between 27,000 and 52,000 occupant records per year during 1985 to1991, and between 74,000 and 130,000 records per year during the 1992-2007. This increase is due to inclusion of the uninjured occupants from 1992 onwards as discussed earlier.  In general, the number of linkable accidents and related vehicles has decreased over time.

For consistency with other HSIS states, pedestrian/equestrian/pedalcycle accidents (which are a subset of the Illinois raw accident file) have been merged into the Vehicle subfile.  A "vehicle" on the accident form which is actually a pedestrian, equestrian, or pedalcycle can be identified by VEHTYPE=98 in the variable related to "Type of Vehicle." The remaining 200,000 to 300,000  "unlinkable" accidents each year are predominantly those occurring on city streets or minor township roads.  These roadways are inventoried to a lesser extent than are the higher order roadways, but this lower level inventory has not been obtained for HSIS use since the accident coders do not attach a specific location reference code to the accident reports for such locations.

In addition, because no inventory data exist for "toll roads" or “ramps” in the Roadlog File, these accidents (which were included in the HSIS accident files for 1985-87) cannot be linked with roadway data for analysis purposes.  Since the majority of the HSIS analyses involve linkage with roadway data, a decision was made to delete these toll road accidents from the HSIS files beginning with 1988.  In addition, a second decision was made to delete all “ramp” accidents from the files beginning with the 1993 files.  This results in an approximate 10 percent decrease in the total number of accidents (and vehicles and occupants) in the files between the 1992 data and the 1993 data.

As with other States, not all accidents on the file are reported by police.  Approximately 4.8 percent of the records on the original 1985-87 files were driver reports which have no corresponding police report, and thus the data from the driver report is punched directly into the system.  An additional 11.2 percent of the early files are "desk reports" filed by the State Police, city police or county sheriffs.  These desk reports are not the result of a direct investigation by an officer on the scene, but instead are based on information provided to an officer at a police headquarters.  Thus, both the desk reports and the driver reports would be expected to be somewhat less accurate than the "normal" reports filed by investigating officers on the scene.  Driver reports would be assumed to be even less accurate due to expected "self-reporting" biases in variables related to fault, driver condition, safety belt usage, or other variables related to vehicular laws.  Examination of the data did indeed indicate far more "unknown" and "not stated" codes in these driver reports.  Due to this possible bias, the large size of the sample even without these reports, and the subsequent elimination of these reports from all HSIS analyses conducted during the 1988-89 period, the driver and desk reports have been eliminated from 1988 and later Accident Files.  It is strongly recommended that the remaining 1985-87 driver and desk reports be eliminated from all analyses.

Approximately 70 percent of the accidents on the linkable file are property damage only and 0.5 percent are fatal accidents. (Single-variable tables presented in a later section of this documentation provide further details of these breakdowns.)  Approximately 82 percent of the accidents are multi-vehicle in nature, while the remaining 18 percent are single-vehicle accidents of one type or another. When reporting agency was examined, it appears that the Illinois files are slightly more biased to urban/suburban crashes than are some of the other HSIS states.

An assessment of the completeness and accuracy of the data is based on conversations with Illinois staff, use of the data in prior HSIS analysis efforts, and a series of single-variable tabulations run each year for key analysis variables.  These quality-control runs allows the HSIS staff to examine both the percent uncoded for each variable and changes across time in the individual codes within each key variable.  These yearly runs are performed on all the variables.

These runs have consistently indicated that almost all of the variables in the three subfiles have very few uncoded cases and very few error codes.  The only significant differences noted across the coded categories appear to be the result of the new report form in 1993.  Where high numbers of uncoded cases or inconsistencies in codes are found, a "NOTE" has been included under the pertinent variable in the later SAS format sections.

In addition to the quality-control checks noted above, in order to further check the accuracy of some of the accident variables, a series of comparisons were made of variables which should have been somewhat similar on the accident subfiles according to their definitions (both within the same subfile and across subfiles).  These single-variable tabulations were also compared to HSIS staff knowledge of the North Carolina accident files to see if major (unexplained) discrepancies existed. In general, the comparisons indicated the files were quite accurate.  For example, the rural and urban breakdown in the "Federal Functional Class" variable matched quite well with the rural and urban breakdown in the "Traffic way Class" variable.  The counts under the variable related to "Total Injuries" matched quite well with the accident severity variable, and counts from the collision type variable matched well with what would be expected from the "Number of Vehicles" variable.  Again, there are a few cases in which variables are either less than totally consistent with other variables or have changed across time (e.g., head-on and sideswipe codes under "Type of Collision" appear to indicate opposing vehicles directions immediately prior to impact rather than their initial direction.)  Again, where found, a "NOTE" has been included in the SAS formats.

However, in general, analysis of the Illinois accident, vehicle, and occupant subfiles indicated that these files are quite accurate in almost all cases, are quite internally consistent, and, with few exceptions, have very few "not stated" cases.  The only major inconsistencies are due to changes in codes in the 1993 data and the fact that uninjured occupants are included in the Occupant Subfile for 1992 and 1993. For more details of the changes in codes from 1993 onwards, please refer to the format files.

The VIN File

Supplemental data on a vehicle characteristics (e.g., engine information, air bag presence, wheel base, etc.) can be developed by decoding the VIN (Vehicle Identification Number) collected on crash forms by police agencies in some states. For Accident/Vehicle Files from 1987-94, formats for the decoded VIN files were included in the original Guidebooks, and separate VIN files were developed for each year of data for the states of Utah, Illinois, Michigan, and North Carolina. When a vehicle in the Vehicle File had a legitimate VIN, this decoding was done using the VINDICATOR program distributed by the Highway Loss Data Institute of IIHS (the Insurance Institute of Highway Safety). This detailed information could then be linked back with the vehicle file using the Accident Case Number and the Vehicle Number.

Because of the very limited use of the VIN data by researchers and difficulties we encountered with the decoding process after 1994, the VIN variable listing found in the original Guidebooks for these states has been removed from this version. However, HSIS continues to capture the VIN, and has the capabilities of decoding the VIN for users. For Illinois, decoded VIN information is available for 1987-96, and VINs for later years can be decoded upon request. For more information on this data, contact the HSIS staff.

The Roadlog File

As noted above, the Roadlog file contains current characteristics of the road system.  It contains information on homogeneous sections of highway for approximately 16,000 miles of roadway, with approximately 1,700 miles of Interstate, 9,600 miles of other primary roadway, and 5,000 miles of secondary, county and township roads.  Currently, there are twenty oneRoadlog files in the HSIS system -- 1987-2007.  Beginning in 1997, IL DOT started sending us new roadway files based on a new referencing system. When the mileages by different roadway types were checked against the 1994 data it was found that there was some increase in the mileage for various categories for 1997, but the mileage remained consistent between 1997 and 2007 data. The IL DOT indicated that in these new files there are some coinciding routes that were causing an increase in the total mileage due to double counting. However, the crashes are always posted to the higher order routes if two routes coincide. Hence it was decided to eliminate the lower order coinciding routes using CON_CURR variable. This elimination of roadway segments made the total mileage comparable to previous years. These new roadlog files contain additional data on intersections, horizontal and vertical curves that is different from the previous year files. More detailed explanation of these new variables is given below. Table 1 below provides a categorization of all two-way paved mileage in the 2007 data.

It should be noted that the definition of "homogeneous section" is based on fifteen different variables -- number of lanes, access control, one-way/two-way operation, shoulder width, shoulder type, median width, median type, parking lane width, ADT, speed limit, vertical curve length, horizontal curve radius, and three variables related to political boundaries and city size.  Thus, anytime one of these variables changes, a new section is started.  However, it is also noted that a new section is not begun with changes in other variables -- pavement width and percent trucks, for example. The inventory file is updated yearly based on inventories performed by district field personnel.  When a new section of roadway is planned, a "blank" record is put into the file indicating that a roadway section will be added, but no data is entered at this point.  Once the roadway is completed and open for traffic, it is inventoried by the field personnel.  The characteristics of the completed road are compared to those on the plans, and a listing of the true characteristics is sent back to headquarters to be entered in the inventory file.

A similar updating procedure is carried out when improvements (such as 3R improvements) or modifications of the roadway are carried out.  When a large-scale modification such as a lane widening or curve flattening is planned for a section of road, district engineers make note of the fact that the roadway inventory will have to be changed as soon as the road is completed.  When the modification is completed, the field personnel inventory the new roadway; send the revised data to headquarters, and the data is entered into the inventory file. The file is then completely updated at the end of each year.  (It is noted that the updated file is usually available around April 1 of the following year.)

The file contains approximately 80,000 to 160,000 records during the period 1987-2007, each representing a section of "homogeneous" roadway where characteristics remain constant.  Thus, the average section length is about 0.15 mile.   Approximately 60 % of the mileage is in non-municipal (rural) areas, and 70 % are two-lane roadways.

Note that prior to 1997, horizontal curvature information was captured on the roadlog file rather than on a separate "curvature" file.  (As will be described below, a separate curvature file exist for 1997 and later years.)  In those earlier years, curve section beginning and end points are defined somewhat differently from what might be expected.  More specifically, when curvature changes within a given section (say from a tangent to some degree of curve), the section is ended (i.e., a new section is begun) at the Point of Intersection of the tangents (PI) of the horizontal curve, not at the beginning of the curve.  The "old" section (which actually contains one-half the curve) contains no information on curvature variables.  The new roadlog section, which begins at the PI, contains all of the descriptive information related to the curve such as deflection angle, direction, radius and length.  In some sense, if one wished to be able to define exactly where the curve existed on a particular piece of highway, one would have to go to the reference point which exists at the mid-point of the curve and then "back-track" for half the length of the curve back into the preceding section.

Fortunately, this does not raise great problems if one is simply trying to link accidents with their respective curvature data since the DOT coders who "locate" the accidents always code all accidents on a given curve to the reference point for the PI. Thus, accidents can be linked to their respective curve information.  The only exception that might cause some problems would be if an intersection fell within the curve itself.  In this case, accidents, which the coders judge to be related to the intersection, would be coded to the intersection rather than to the PI of the curve. In summary, for years prior to 1997 information on horizontal curves is available in the roadlog file. From 1997 onwards, this information is available in a separate curvature file.

However, of significant importance from an analysis perspective is the fact that the only curves which have complete data on the file are those "potentially substandard" curves which have radii equal to or less than 2291.83 feet (approximately a 2.5 degree curve).  Detailed data are not collected on flatter curves, although partial data (such as deflection angle or direction) may appear on the file if the district engineer wishes to have a "curve marker" there.  It is also the case that information on curves is only collected in rural areas and is not collected on Interstate roadways where all curves are assumed to meet federal standards.  However, there is some information on curves on Interstates, when a district engineer feels that the curve is sub-standard. However, this is neither a complete census nor a random sample and care should be exercised while using this data. Thus, it would appear that the most consistent curvature data would be on those curves where a radius is greater than 2291 feet, and the analyst must be aware that the range of curves available for analysis does not include the flatter (less than 2.5 degree) curves.

For all years, information on vertical grade and vertical curvature is also included on the Roadlog File.  However for years prior to 1997 no beginning and ending milepost information is available. Hence linking crashes to vertical curves for these years is not possible. Also, similar to the horizontal curve data, preliminary analyses with the vertical grade and curve variables and subsequent conversations with Illinois staff indicated that these vertical variables are only coded in those cases in which the engineering staff considers the existing vertical curve to be "substandard" in nature.  Thus, the vertical grade data is neither a full sample nor a random sample of the roadway, and care must be taken in using it in analyses.

As with the accident files, the assessment of accuracy and completeness of the Roadlog File data is based on input from Illinois staff, prior HSIS analyses with the data, and a series of single-variable tabulations for all variables in the file which are run and reviewed each time a new annual file is entered into the HSIS.    In addition, traffic variables concerning the AADT and percent trucks, and alignment variables concerning horizontal curve deflection angle, radius, and direction and vertical curve length and entering/leaving grade are included. 

The quality control runs consistently indicate that most of the variables contained very few uncoded or obviously miscoded values -- only one to three percent in most cases.  There are some cases where a "zero" value may well be both a valid value and may indicate uncoded data (such as with surface condition rating), but even here the percent of sections coded as zero is less than one percent of the file.  Where higher percentages of uncoded data or error codes have been found, a "NOTE" is included in the SAS format.

Further assessment of the accuracy of the data included comparison of the limited number of similar variables in the file.  These comparisons, subsequent HSIS analyses with the files, and the update procedures described above lead to the conclusion that the roadway inventory data is quite accurate.

Two new variables, RODWYCLS and MVMT, have been created by HSIS staff in the roadway segment file of each of the HSIS states. The RODWYCLS (Roadway Class) variable is based on the combination of rural/urban, access control, number of lanes and median type variables. This variable classifies each roadway segment into one of ten roadway types described in the later “Format” section. This variable is also included as an accident-file variable by matching each crash to its corresponding roadway segment. The MVMT variable (Million Vehicle Miles of Travel) is calculated for each segment in the roadway file by multiplying the segment length, AADT and 365 days in a year, and dividing by one million. Both these variables were created in response to inquire from data users, whose most frequent questions have concerned either crash frequencies or rates (per MVMT) for one or more of these roadway classes.

HSIS staff has stopped labeling shoulder type and shoulder width variables as left and right shoulder type and shoulder width respectively from 1997 onwards.  Instead, they are labeled as inside and outside shoulder types and shoulder widths. Further details along with the new variable names are given in the FORMAT section of this guidebook.  This change in variable labeling is based on the definition provided in the IRIS manual if IL DOT.

Traffic Data

As indicated earlier the Roadlog File contains information on AADT, percent trucks for 1990 and earlier, and commercial vehicle AADT for 1991 and later files.  These data are developed in Illinois' traffic volume counting program, and are based on a combination of permanent counters that count traffic 24-hours each day for 365 days each year and a series of short-term "coverage" counts conducted each year.  Before 2001, Illinois had 49 automatic traffic recorders (ATRs), of which 21 were capable of collecting counts by vehicle class in accordance with FHWA's Scheme F.  The ATR locations on the five different classes of roadway included seven on rural Interstate roadway, six locations on urban Interstate locations, 12 locations on other rural roadways, 19 locations on other urban routes, and five locations on “recreational” routes. From 2001, Illinois has 87 ATRs, of which 38 are capable of collecting counts by vehicle class in accordance with FHWA`s Scheme F. The ATR locations on the five different classes of roadway include 11 locations on rural interstate, 6 locations on urban interstate, 16 locations on other rural roadways, 49 locations on other urban routes, and five locations on “recreational” routes.

In addition to the ATR data, short term traffic counts on Interstate and primary highway systems are done on a 2 year cycle. Before 2000, during even-numbered years, portable counter devices were deployed in combination with pre established in pavement loop detectors.  Typically, the counter devices were deployed during one week of the year at any given site.  Short counts (e.g., 24- or 48 hour counts) were collected on Monday through Thursday only. It should be noted that a sample of Interstate sections was counted one week out of every four months.  During odd-numbered years, the Illinois DOT conducted a comprehensive interchange ramp counting program on State Highways.  These ramp counts were used to supplement ADT data for sections where the State did not have monitors (i.e., counter devices).  In total, it was estimated that approximately 96 percent of the primary system is covered during each two-year cycle. From 2000, Illinois started using magnetic lane counters for 24-hour counts during every odd-numbered year. The magnetic lane counters provide volume as well as vehicle classification by length in three categories (passenger vehicles, single-units, multi-units).  Using the magnetic lane counters allow IDOT to collect mainline data for all State primary routes, except the interstates in Chicago area.  The Chicago area interstates are counted with loops by the Expressway Surveillance program and the Illinois Tollway Authority.  Collecting the mainline data eliminates the need for ramp counting.  Short counts (e.g., 24- or 48 hour counts) are collected on Monday through Thursday only. In total, an estimated 99 percent of the primary system is covered during each two-year cycle.

For other non primary roads (i.e., the "off" marked route system), Illinois collects 24-hour coverage counts in approximately 20 percent of the counties once every five years. However, the Northeast Counties are done every four years.  With the exception of Cook County, which is also on a four-year cycle, urban areas within counties are counted on a five-year statewide cycle. 

Before 2001, additional vehicle classification counts are conducted on HPMS sections.  These were made at 300 locations over a three-year cycle (i.e., approximately 100 each year) to form a representative distribution for the State.  The 300 HPMS sections use for classification have been eliminated from 2001 onwards.  Instead of using HPMS sample locations, the use of the magnetic lane counts provides vehicle classification by length for the complete State Primary system every two years.  Rather than sampling, system-wide truck VMT based on actual counts is used.

Finally, the districts often have need for additional traffic data.  Consequently, when requested, the State collects 12 hour turning movement counts at intersection and other "special" traffic data to satisfy these needs.

To convert the short-term coverage counts to AADT, Illinois applies adjustments for seasonal differences in the daily traffic.  For seasonal corrections, each coverage count location is assigned to one of the five categories of roadway where permanent counters are located as defined above.  The seasonal factors are based on averages from all ATRs in that group.

When a road section is not counted during a given year, growth factors are developed and applied to the most recent prior year's count. Average growth factors are created each year for each functional class of roadway using ATR data and data from adjusted short counts for the current year.  The growth factor applied to a particular uncounted section is based on its functional class.  For sections where no prior AADT exist, AADT/mile averages by functional class are developed and then used in order to "fill in" the AADT's.

Finally, it should be noted that the percentages of truck-related "Heavy Commercial Volumes” included "two-axle trucks with six or more tires plus multi-axle vehicles", prior to 2001.   Thus, while pick-ups and vans were excluded, this combination did include single trucks, tractor-semi combinations and buses.  Thus, it couldn’t be considered a count of just the multiple unit (tractor-trailer) trucks that were found on the roadway system.

After 2001, Illinois’ implementation of the vehicle length for truck classification instead of axle classification was approved by FHWA and conforms the new Traffic Monitoring Guide.  Illinois worked closely with FHWA during the time of research and testing on the different equipment that was looked at to solve Illinois needs.  While the permanent ATR locations still collect the Scheme F categories, Illinois only uses the three categories (PV, SU, MU) for their publications and in-house use.

The Intersection-Location Subfile

(Note that in 1997, Illinois stopped providing the intersection data as described in this section. For 1997 and later years, each roadway segment contains three sets of variables to indicate location, type and orientation of intersections. Further details are provided below each of the variables in the FORMAT section of this guidebook for roadlog file.)

The Illinois base roadway inventory file contains two types of records.  First, homogeneous sections are defined by unique beginning and ending mileposts, with the two milepoints never being equal.  Second, an intersection-location record is included for each intersection, which falls in a given homogeneous section.  Thus, if three intersections fall within a given section, three records with mileposts between the original beginning and ending mileposts will be provided.  These intersection-location records are defined by having the beginning and ending mileposts equal to each other. 

In building the HSIS files, we have separated all intersection records into a separate file, with one such file corresponding to each yearly Roadlog File.  Each record on this file contains the milepost (reference point) and all variables appearing on the Roadlog section file, and the data included refer to the section of roadway downstream from the intersection.  Unfortunately, this file does not contain desirable intersection-related variables such as type of intersection (e.g., T or cross), entering traffic volumes, or traffic control type (although this latter variable may be available after 1989).  However, this file can be used in two ways.  First, if one were to desire to do an analysis of "clean" sections without intersection-related accidents being part of the analysis, the Intersection-Location subfile could be merged with the appropriate sections in the Roadlog file, and all accidents, which fall at the intersection milepoints, could be deleted.  (Illinois codes all intersection-related accidents to the specific milepost of the intersection, even if they occur upstream or downstream.)  Second, as noted above, if one wished to analyze variables which do not cause breaks in sections (such as surface width or percent trucks), then it would be possible to divide the existing sections into shorter sections, with a break occurring at each intersection.  These shorter sections could then be merged back into longer sections with breaks only on variables of interest.  Some programming has been developed to do such merging.

The “Deficient” Horizontal Curve Files

As indicated above, curvature information on “deficient curves” is captured on the Roadlog File prior to 1997.  From 1997 onwards, HSIS Staff has extracted new curvature variables from the Roadlog File and created a horizontal curvature file. As in earlier years, these files continue to contain information on “deficient” horizontal curves.  IL defines a curve to be “deficient” if its radius is less than 2291.83 feet (>= 2.5 degrees). Detailed data are not collected on flatter curves, although partial data (such as deflection angle or direction) may appear on the file if the district engineer wishes to have a "curve marker" there.  It is also the case that information on curves is only collected in rural areas and is not collected on Interstate roadways where all curves are assumed to meet federal standards. However, the engineering staff has recorded some curves on the interstate system, which are captured in the data. As stated above, these curves on interstate are neither a random sample nor a complete census. The majority of reported curves occur on U. S. and State maintained routes.  An annual file is available for years 1997 to 2007. On the average it contains 3,400 curves covering approximately 450 miles.  Based on the values of radius of curve, degree of curve has been calculated and added to the file.  Thus, this file includes information on the degree of curve, the direction of curve, length of curve and radius of curve.

Issues Related to Merging Files

As noted above, the Illinois accident data are subdivided into three subfiles -- accident, vehicle and occupant.  These subfiles can be linked together using the "case number" variable (i.e., CASENO), which is present in each of the three files.

This variable includes the accident year.  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 number. Next sort the Accident subfile by case number.  Alternatively, the separate subfiles can 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 presorted 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 Roadlog File using information related to county, route prefix/type (e.g., I, US, MN, etc.), route number and milepost on the route.  The actual linkage variables on the Accident file, which are used in the merging operation, are CNTYRTE and MILEPOST.  The linkage variables on the Roadlog File are BEGMP, ENDMP and CNTY_RTE. The CNTYRTE and CNTY_RTE variables are computed linkage keys, which are created by combining variables, related to county (COUNTY), route prefix (RTE_PREF), and route number (RTE_NBR).

To prepare the Accident subfile for linking with the Roadlog File using a SAS data step process, the analyst must sort both the Accident and the Roadway File into location order by CNTYRTE and MILEPOST on the Accident file and by CNTY_RTE and BEGMP on the Roadlog File.  For the alternative SQL join, the analyst must specify an exact match on CNTYRTE and CNTY_RTE from the Accident and Roadlog files, and a range match where MILEPOST occurs between BEGMP and ENDMP.  (Programs to accomplish this merging 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.

ILLINOIS CONTACTS

HSIS Liaison – Michael Gillette (217-524-9108) -- is the HSIS Liaison for Illinois.  He is the Technology Support Unit Chief in the Bureau of Safety Engineering of the Illinois DOT and oversees all safety files.  

State Computer files and Accident Data contact – Lori Midden (217-785-2736) -- Ms. Midden is our main contact within the State of Illinois when questions arise concerning the Illinois state data files in general or the specifics of the accident data.  She is the Special Studies and Systems Manager within the Bureau of Safety Data and Data Services of the Illinois DOT.  She should be the primary contact for all questions, and will direct questions she can't answer to others.

Roadlog Information – Andrew Gossrow (217-785-8511) -- Mr. Gossrow is the contact person for questions related to the specifics of the Roadlog file. He works within the Illinois DOT Bureau of Roadway Planning, and his office staff is responsible for all aspects of the inventory information including traffic and curvature data.  In his absence, Mr. Rob Robinson (217) 785-2353 can provide information.

COMPOSITE LIST OF VARIABLES

Accident File

Accident Subfile

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE ILLINOIS STATE ACCIDENT SUBFILE

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

ACCTYPE_POST_93 

TYPE OF COLLISION

• 1 = 'PEDESTRIAN ACCIDENT'
• 2 = 'PEDALCYCLIST'
• 3 = 'TRAIN ACCIDENT'
• 4 = 'ANIMAL'
• 5 = 'VEHICLE OVERTURNED'
• 6 = 'FIXED OBJECT'
• 7 = 'OTHER OBJECT'
• 8 = 'OTHER NONCOLLISION'
• 9 = 'PARKED VEHICLE'
• 10 = 'TURNING'
• 11 = 'REAR END'
• 12 = 'SIDESWIPE SAME DIRECTION'
• 13 = 'SIDESWIPE OPPOSITE DIRECTION'
• 14 = 'HEADON'
• 15 = 'ANGLE'
• 99 = 'OTHER'

NOTE: Variable added in 1993. For data belonging to previous years, see ACCTYPE_PRE_93.

ACCTYPE_PRE_93

TYPE OF COLLISION

• 02 = 'VEHICLE OVERTURNED ON ROADWAY'
• 03 = 'PEDESTRIAN ON ROADWAY'
• 04 = 'RAILROAD TRAIN ON ROADWAY'
• 05 = 'PEDAL CYCLIST ON ROADWAY'
• 06 = 'ANIMAL ON ROADWAY'
• 07 = 'FIXED OBJECT ON ROADWAY'
• 08 = 'OTHER OBJECT ON ROADWAY'
• 09 = 'OTHER NON-COLLISION ON ROADWAY'
• 10 = 'PARKED MOTOR VEHICLE ON ROADWAY'
• 11 = 'REAR-END - BOTH MOVING ON ROADWAY'
• 12 = 'REAR-END - ONE STOPPED ON ROADWAY'
• 13 = 'HEAD-ON ON ROADWAY'
• 14 = 'SIDESWIPE - SAME DIRECTION ON ROADWAY'
• 15 = 'SIDESWIPE - OPPOSITE DIRECTION ON ROADWAY'
• 16 = 'ANGLE ON ROADWAY'
• 17 = 'TURNED ON ROADWAY'
• 18 = 'OTHER ON ROADWAY'
• 32 = 'VEHICLE OVERTURNED OFF ROADWAY'
• 33 = 'PEDESTRIAN OFF ROADWAY'
• 34 = 'RAILROAD TRAIN OFF ROADWAY'
• 35 = 'PEDAL CYCLIST OFF ROADWAY'
• 36 = 'ANIMAL OFF ROADWAY'
• 37 = 'FIXED OBJECT OFF ROADWAY'
• 38 = 'OTHER OBJECT OFF ROADWAY'
• 39 = 'OTHER NON COLLISION OFF ROADWAY'
• 40 = 'PARKED MOTOR VEHICLE OFF ROADWAY'
• 41 = 'REAR-END - BOTH MOVING OFF ROADWAY'
• 42 = 'REAR-END - ONE STOPPED OFF ROADWAY'
• 43 = 'HEAD-ON OFF ROADWAY'
• 44 = 'SIDESWIPE - SAME DIRECTION OFF ROADWAY'
• 45 = 'SIDESWIPE – OPPOSITE DIRECTION OFF ROADWAY'
• 46 = 'ANGLE OFF ROADWAY'
• 47 = 'TURNING OFF ROADWAY'
• 48 = 'OTHER OFF ROADWAY'
• 50 = 'VEHICLE OVERTURNED'
• 51 = 'PEDESTRIAN ACCIDENT'
• *52 = 'TRAIN ACCIDENT'
• *53 = 'PEDAL CYCLIST ACCIDENT'
• *54 = 'ANIMAL'
• *55 = 'FIXED OBJECT INVOLVED'
• *56 = 'OTHER OBJECT INVOLVED'
• *57 = 'OTHER NON COLLISION'
• *58 = 'PARKED VEHICLE INVOLVED'
• **59 = 'REAR END CRASHES MOVING'
• **60 = 'REAR END CRASHES STOPPED'
• *61 = 'HEAD-ON COLLISION'
• *62 = 'SIDESWIPE SAME DIRECTION'
• *63 = 'SIDESWIPE OPPOSITE DIRECTION'
• *64 = 'ANGLE'
• *65 = 'TURNING ON OR OFF ROAD'
• *66 = 'OTHERS'
• OTHER ='ERROR CODES'

NOTE: (1) Preliminary analysis has indicated that the "head-on" and sideswipe - opposite direction" codes refer to vehicle direction immediately prior to impact rather than initial direction. (2) Changes in the 1993 accident report form have resulted in minor shifts from code to code when compared to earlier files. (3) * Indicates the new formats that are followed from 1994 onwards. Only these codes are used to describe an accident from 1994 onwards as against the codes that were used previously. (4) ** Rear end moving and rear end stopped categories combined into one category Rear end crashes. (5) Variable discontinued in 1993. For data belonging to later years, see ACCTYPE_POST_93.

ACCYR

ACCIDENT YEAR

NON-LABELED VARIABLE

NOTE: The last 2 digits of year of accident.

ACC_DATE      

DATE ACCIDENT OCCURRED

NON-LABELED VARIABLE

NOTE: MM/DD/YY for 1994 and 1995 and YY/MM/DD for others.

AGENCY        

INVESTIGATING AGENCY

• . = 'NOT CODED'
• 0 = 'NONE'
• 1 = 'CITY POLICE'
• 2 = 'COUNTY SHERIFF'
• 3 = 'STATE POLICE'
• 4 = 'CITY POLICE OTHER THAN CITY OF OCCURRENCE'
• 5 = 'CITY POLICE DESK REPORT'
• 6 = 'COUNTY SHERIFF DESK REPORT'  
• 7 = 'STATE POLICE DESK REPORT'    
• 8 = 'CITY POLICE OTHER THAN CITY OF OCCURRENCE DESK REPORT'
• 9 = 'OTHER'
• OTHER = 'ERROR CODES'

NOTE: Categories 5-8 represent “desk reports”, which have been removed from 1987 onwards.

ALIGN_CODE    

ALIGNMENT

• 1 = 'STRAIGHT AND LEVEL'
• 2 = 'STRAIGHT ON GRADE'
• 3 = 'STRAIGHT ON HILLCREST'
• 4 = 'CURVE, LEVEL'
• 5 = 'CURVE ON GRADE'
• 6 = 'CURVE ON HILLCREST'
• 9 = 'UNKNOWN'

NOTE: Variable added in 2006.

BADGE         

BADGE CODE

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1997.

BEAT_CDE      

BEAT CODE

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1997.

CASENO        

ACCIDENT CASE NUMBER

NON-LABELED VARIABLE -- CASE NUMBER

CAUSE1        

CONTRIBUTORY CAUSE 1

CAUSE2        

CONTRIBUTORY CAUSE 2

• '  ' = 'NOT CODED'
• '01' = 'EXCEEDING AUTHORIZED SPEED LIMIT'
• '02' = 'FAILING TO YIELD RIGHT-OF-WAY'
• '03' = 'FOLLOWING TOO CLOSELY'
• '04' = 'IMPROPER OVERTAKING/PASSING'
• '05' = 'DRIVING ON WRONG SIDE/WRONG WAY'
• '06' = 'IMPROPER TURNING/NO SIGNAL'
• '07' = 'TURNING RIGHT ON RED'
• '08' = 'UNDER THE INFLUENCE OF ALCOHOL/DRUGS (USE WHEN ARREST IS EFFECTED)'
• '10' = 'EQUIPMENT - VEHICLE CONDITION'
• '11' = 'WEATHER'
• '12' = 'ROAD ENGINEERING/SURFACE/MAKING DEFECTS'
• '13' = 'ROAD CONSTRUCTION/MAINTENANCE'
• '14' = 'VISION OBSCURED (SIGNS, TREE LIMBS, BUILDINGS, ETC)'
• '15' = 'DRIVING SKILLS/KNOWLEDGE/EXPERIENCE'
• '17' = 'PHYSICAL CONDITION OF DRIVER'
• '18' = 'UNABLE TO DETERMINE'
• '19' = 'HAD BEEN DRINKING'
• '20' = 'IMPROPER LANE USAGE'
• '21' = 'ANIMAL'
• '22' = 'DISREGARDING YIELD SIGN'
• '23' = 'DISREGARDING STOP SIGN'
• '24' = 'DISREGARDING OTHER TRAFFIC SIGNS'
• '25' = 'DISREGARDING TRAFFIC SIGNALS'
• '26' = 'DISREGARDING ROAD MARKINGS'
• '27' = 'EXCEEDING SAFE SPEED FOR CONDITIONS'
• '28' = 'FAILING TO REDUCE SPEED TO AVOID CRASH'
• '29' = 'PASSING STOPPED SCHOOL BUS'
• '30' = 'IMPROPER BACKING'
• '32' = 'EVASIVE ACTION DUE TO ANIMAL, OBJECT, NONMOTORIST'
• '40' = 'DISTRACTION - FROM OUTSIDE VEHICLE'
• '41' = 'DISTRACTION - FROM INSIDE VEHICLE'
• '42' = 'DISTRACTION - OPERATING A WIRELESS PHONE'
• '50' = 'OPERATING VEHICLE IN ERRATIC, RECKLESS, CARELESS, NEGLIGENT OR AGGRESSIVE MANNER'
• '99' = 'NOT APPLICABLE'
• OTHER= 'ERROR CODES'

NOTE: Because this variable is only filled out by the State Police, over 80% of the cases are coded "unknown".

CITY          

CITY OR TOWNSHIP

NOTE: A number indicating the city. For a detailed list of cities and their corresponding numbers, contact HSIS staff.

CITY_TWNSHIP_FLG

CITY/TOWNSHIP FLAG

• 'C' = 'CITY'
• 'T' = 'TOWNSHIP'

NOTE: Variable added in 2006.

CLS_TFWY      

CLASS OF TRAFFICWAY

• . = 'NOT CODED'                   
• 0 = 'UNMARKED STATE HIGHWAY - RURAL'
• 1 = 'CONTROLLED-ACCESS HIGHWAY - RURAL'
• 2 = 'OTHER STATE NUMBERED HIGHWAY - RURAL'      
• 3 = 'COUNTY AND LOCAL ROADS AND STREET - RURAL'
• 4 = 'TOLL ROAD - RURAL'
• 5 = 'CONTROLLED-ACCESS HIGHWAY - URBAN'
• 6 = 'OTHER STATE NUMBERED HIGHWAY - URBAN'
• 7 = 'UNMARKED STATE HIGHWAY - URBAN'
• 8 = 'CITY STREET - URBAN'         
• 9 = 'TOLL ROAD - URBAN'           
• OTHER = 'ERROR CODES'             

NOTE: Data related to “toll roads” (“4” and “9”) couldn’t be linked to roadway variables. It has been deleted for all years of data.

CNTYRTE       

COMPUTED LINKAGE KEY

NON-LABELED VARIABLE -- Computed variable used in linkage with Road log File. See Discussion.

COUNTY        

COUNTY OF ACCIDENTS

'001-102' = COUNTY NUMBER

NOTE: See Roadlog file for county formats.

CRSH_LAT      

CRASH LATITUDE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

CRSH_LONG     

CRASH LONGITUDE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

CRSH_X_CORD   

CRASH X COORDINATE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

CRSH_Y_CORD   

CRASH Y COORDINATE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

CTY_CLS       

CITY CLASS CODE

• 0 = 'UNINCORPORATED'
• 3 = 'CHICAGO'
• 4 = 'POPUATION UNDER 2500'
• 5 = '2500 - 5000'
• 6 = '5 - 10 THOUSAND'
• 7 = '10 - 25 THOUSAND'
• 8 = '25 - 50 THOUSAND'
• 9 = 'OVER 50 THOUSAND'

NOTE: Variable added in 2004.

DAM_OTHR      

PROPERTY DAMAGE OTHER THAN VEH

• 0 = 'OVER 500'
• 1000-99999 = 'UNDER 500'

DIST          

DISTRICT NUMBER

• 1 = 'SCHAUMBURG'                  
• 2 = 'DIXON'                       
• 3 = 'OTTAWA'                      
• 4 = 'PEORIA'                      
• 5 = 'PARIS'                       
• 6 = 'SPRINGFIELD'                 
• 7 = 'EFFINGHAM'                   
• 8 = 'FAIRVIEW HEIGHTS'            
• 9 = 'CARBONDALE'                  

NOTE: Variable discontinued in 1994.

DIVIDED       

TRAFFICWAY DESCRIPTION

• 1 = 'TWO-WAY, NOT DIVIDED'
• 2 = 'TWO-WAY, DIVIDED, NO MEDIAN BARRIER'
• 3 = 'TWO-WAY, DIVIDED WITH MEDIAN BARRIER'
• 4 = 'TWO-WAY, CENTER TURN LANE'
• 5 = 'ONE-WAY OR RAMP'
• 6 = 'ALLEY OR DRIVEWAY'
• 7 = 'PARKING LOT'
• 8 = 'OTHER'
• 9 = 'UNKNOWN'

NOTE: Variable added in 2006.

FED_CLAS      

FEDERAL CLASSIFICATION

• .  = 'NOT CODED'
• 01 = 'INTERSTATE RURAL'
• 02 = 'INTERSTATE URBAN'
• 03 = 'PRIMARY PRINCIPAL ARTERIAL – FEDERAL-AID RURAL'
• 04 = 'PRIMARY PRINCIPAL ARTERIAL - FEDERAL-AID URBAN'
• 05 = 'PRIMARY MINOR ARTERIAL - FEDERAL-AID RURAL'
• 06 = 'PRINCIPAL ARTERIAL – FEDERAL-AID URBAN'
• 08 = 'REGIONAL ARTERIAL - URBAN'
• 09 = 'SECONDARY MAJOR COLLECTOR - FEDERAL-AID RURAL'
• 10 = 'MAJOR COLLECTOR - NON-FEDERAL-AID RURAL'
• 11 = 'MINOR COLLECTOR - NON-FEDERAL-AID RURAL'
• 12 = 'LOCAL ROADS – NON-FEDERAL-AID RURAL'
• 13 = 'OTHER PRINCIPAL ARTERIAL – FEDERAL-AID URBAN'
• 14 = 'OTHER PRINCIPAL ARTERIAL - NON-FEDERAL-AID URBAN'
• 15 = 'MINOR ARTERIAL - FEDERAL-AID URBAN'
• 16 = 'MINOR ARTERIAL - NON-FEDERAL-AID URBAN'
• 17 = 'COLLECTORS - FEDERAL-AID URBAN'
• 18 = 'COLLECTORS - NON-FEDERAL-AID URBAN'
• 19 = 'LOCAL STREETS - NON-FEDERAL-AID URBAN'
• OTHER = 'ERROR CODES'

NOTE: The above formats are applicable until 1993. For later years, this variable is generated based on NAT_HWY and FUNC_CLS. If the road is federal aided (obtained from NAT_HWY) and is categorized as FUNC_CLS = 1 then this variable is coded as 11. If the road is non-federal aided and the road is categorized as FUNC_CLS = 1 then this variable is coded as 01. This is applicable to all values of FUNC_CLS.

FLD_NAM1      

FIELD REF NAME 1

FLD_NAM2      

FIELD REF NAME 2

NON-LABELED VARIABLES

NOTE: Variables discontinued in 1997.

FLD_NBR1      

FIELD REF NUMBER 1

FLD_NBR2      

FIELD REF NUMBER 2

NON-LABELED VARIABLES

NOTE: Variables discontinued in 1997.

FLD_TYPE      

FIELD REF TYPE

NON-LABELED VARIABLE

NOTE: Variables discontinued in 1997.

FUNC_CLS      

FUNCTIONAL CLASS

• .  = 'NOT CODED'
• 10 = 'INTERSTATE'
• 20 = 'FREEWAY AND EXRPESSWAY (URBAN ONLY)'
• 30 = 'OTHER PRINCIPAL ARTERIAL'
• 40 = 'MINOR ARTERIAL (NON-URBAN)' 
• 50 = 'MAJOR COLLECTOR (NON-URBAN)'
• 55 = 'MINOR COLLECTOR (NON-URBAN)'
• 60 = 'LOCAL ROAD OR STREET (NON-URBAN)'
• 70 = 'MINOR ARTERIAL (URBAN)'
• 80 = 'COLLECTOR (URBAN)'
• 90 = 'LOCAL ROAD OR STREET (URBAN)'

NOTE: This variable is attached from roadway segments.

HIT_RUN       

HIT AND RUN

• '0', ' ' = 'NOT STATED'           
• '1' = 'YES'                       
• '2' = 'NO'                        

NOTE: Variable added in 1994.

HOUR          

TIME OF ACCIDENT

• .  = 'NOT CODED'
• 00 = '12 AM – 12:59 AM'
• 01 = '01 AM - 01:59 AM'
• 02 = '02 AM - 02:59 AM'
• 03 = '03 AM - 03:59 AM'
• 04 = '04 AM - 04:59 AM'
• 05 = '05 AM - 05:59 AM'
• 06 = '06 AM - 06:59 AM'
• 07 = '07 AM - 07:59 AM'
• 08 = '08 AM - 08:59 AM'
• 09 = '09 AM - 09:59 AM'
• 10 = '10 AM – 10:50 AM'
• 11 = '11 AM – 11:59 AM'
• 12 = '12 PM - 12:59 PM'
• 13 = '01 PM - 01:59 PM'
• 14 = '02 PM - 02:59 PM'
• 15 = '03 PM - 03:59 PM'
• 16 = '04 PM - 04:59 PM'
• 17 = '05 PM - 05:59 PM'
• 18 = '06 PM - 06:59 PM'
• 19 = '07 PM - 07:59 PM'
• 20 = '08 PM - 08:59 PM'
• 21 = '09 PM - 09:59 PM'
• 22 = '10 PM – 10:59 PM'
• 23 = '11 PM – 11:59 PM'
• 24 = 'NOT STATED'
• OTHER = 'ERROR CODES'

IMAG_NBR      

IMAGE NUMBER

NON-LABELED VARIABLE -- Internal use only

NOTE: (1) This variable was added in 1990 to aid Illinois DOT in the location of accident report forms.  (2) Variable discontinued in 1995.

INT_NAME      

INTESECTING RTE NBR

NON-LABELED VARIABLE

NOTE: Variable discontinued in 2004.

INT_PREF      

INTERSECT RTE PREFIX

NON-LABELED VARIABLE

INT_QUAD      

INTERSECTION QUADRANT

• . = 'NOT CODED'
• 0 = 'NOT STATED'                  
• 1 = 'N QUADRANT'                  
• 2 = 'NE QUADRANT'                 
• 3 = 'E QUADRANT'                  
• 4 = 'SE QUADRANT'                 
• 5 = 'S QUADRANT'                  
• 6 = 'SW QUADRANT'                 
• 7 = 'W QUARDRANT'                 
• 8 = 'NW QUADRANT'                 
• 9 = 'NOT APPLICABLE'              
• OTHER = 'ERROR CODES'

NOTE: (1) For years 1994 onwards, no formats available. All observations coded as 0. For prior years, most observations coded as 0. This variable should be used with caution. (2) Variable discontinued in 2004.

INT_REL       

INTERSECTION RELATED

• '1' = 'YES'                       
• '2' = 'NO'                        
• '0', ' ' = 'NOT STATED'           

NOTE: Variable added in 1994.

LIGHT         

LIGHT CONDITION

• . = 'NOT CODED'
• 0 = 'NOT STATED'                  
• 1 = 'DAYLIGHT'                    
• 2 = 'DAWN'                        
• 3 = 'DUSK'                        
• 4 = 'DARKNESS'                    
• 5 = ' DARKNESS, LIGHTED ROAD'     
• 9 = 'UNKNOWN'
• OTHER = 'ERROR CODES'

LOC_TYPE      

LOCATION TYPE

• .  = 'NOT CODED'                  
• 00 = 'NOT APPLICABLE'             
• 01 = 'RAILROAD CROSSING'          
• 02 = 'BRIDGE'                     
• 03-08 = 'NOT CODED'               
• 09 = 'UNDERPASS'                  
• 10 = 'RAMP'                       
• 11 = 'CROSSOVER'                  
• 12 = 'INTERSECTION OF MARKED ROUTES AND PUBLIC ROAD (MAJOR ARTERIAL)'
• 13 = 'INTERSECTION OF MARKED ROUTES AND PUBLIC ROAD (MAJOR COLLECTOR)'
• 14 = 'INTERSECTION OF MARKED ROUTES'
• 15 = 'INTERSECTION OF MARKED ROUTES AND PUBLIC ROAD; LOCAL STREET'
• 16 = 'INTERSECTION OF MARKED ROUTE AND COMMERCIAL ENTRY, ALLEY'
• 17 = 'INTERSECTION OF MARKED ROUTE AND PRIVATE ENTRANCE'
• 18 = 'INTERSECTION OF RAMP AND OTHER ROADWAY'
• 19 = 'INTERSECTION OF LOCAL ROADS, URBAN AND RURAL'
• 20 = 'INTERSECTION OF COUNTRY ROAD/CITY STREET/ALLEY AND COMMERCIAL OR PRIVATE ENTRANCE'
• 22 = 'INTERSECTION OF MARKED ROUTES AND PUBLIC ROAD (MINOR ARTERIAL)'
• 23 = 'INTERSECTION OF MARKED ROUTES AND PUBLIC ROAD (MINOR COLLECTORS)'
• OTHER = 'ERROR CODES'

NOTE: There appears to be overlapping of categories when earlier years are compared to later years. Also categories 16 and 17 are not available for later years (1996 onwards). The distribution of observations is agreeable for later years. Exercise caution when using this variable for early as well later years.

MILEPOST      

MILE STATION

NON-LABELED VARIABLE

MVMT          

MILLION VEHICLE MILES OF TRAVEL

NON-LABELED VARIABLE

NOTE: Variable added in 2003.

NAT_HWY       

NATIONAL HIGHWAY SYSTEM

• 'False' = 'NOT ON NHS'
• 'True' = 'ON NHS'
• ' ' = ' NOT CODED'

NOTE: Variable added in 1994.

NUMVEHS       

TOT-NBR-VEHICLES

• .     = 'NOT CODED'
• 00    = '00'
• 01    = '01'
• 02    = '02'
• 03    = '03'
• 04    = '04'
• 05-10 = '05 TO 10'
• 11-20 = '11 TO 20'
• 21-50 = '21 TO 50'
• OTHER = 'ERROR CODES'

OLD_DATE      

DATE MM/DD/YY

NOTE: Variable added in 1994 and discontinued in 1996.

OP_ID         

OPERATOR ID

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1995.

POP_GRP       

POPULATION GROUP

• 0 = '0 - 999'
• 1 = '1,000-2,499'
• 2 = '2,500-4,999'
• 3 = '5,000-9,999'
• 4 = '10,000-24,999'
• 5 = '25,000-49,999'
• 6 = '50,000-99,999'
• 7 = '100,000-249,999'
• 8 = '250,000-999,999'
• 9 = '1,000,000 & OVER'
• . = 'NOT IN MUNICIPAL'

NOTE: (1) Do not use this variable to define "urban/rural". Instead use either the variable related to "federal functional" class"(FED_CLAS) or "traffic way class" (CLS_TFWY) as indicator of urban or rural location. (2) Variable discontinued in 2004.

RD_DEF        

ROAD DEFECTS

• .  = 'NOT CODED'
• 00 = 'NOT STATED'
• 01 = 'NO DEFECTS'
• 02 = 'CONSTRUCTION ZONE' 
• 03 = 'MAINTENANCE ZONE'
• 04 = 'UTILITY WORK ZONE'
• 05 = 'WORK ZONE - UNKNOWN'
• 06 = 'SHOULDERS HGH, LO, SFT'
• 07 = 'RUTS, HOLES, BUMPS'
• 08 = 'WORN SURFACE'
• 09 = 'DEBRIS ON ROADWAY'
• 10 = 'OTHER'
• 11 = 'LOOSE MATERIALS'            
• 12 = 'LOW SHOULDER'               
• 13 = 'SOFT SHOULDER'              
• 14 = 'REPAIR WK BARRIC'           
• 15 = 'REPAIR WK N/BARR'           
• 99 = 'UNKNOWN'

NOTE: Categories 11-15 apply to data before 2004.

RDSURF        

ROAD SURFACE

•  . = 'NOT CODED'
•  0 = 'NOT STATED'
•  1 = 'DRY'
•  2 = 'WET'
•  3 = 'SNOW/SLUSH'
•  4 = 'ICE'
•  5 = 'SAND/OIL/MUD'
•  6 = 'OTHER'
•  9 = 'UNKNOWN'
• 10 = 'ICE/SNOW/FROST'             
• 11 = 'MUDDY'                      
• 12 = 'OILY'                       

NOTE: Categories 10-12 apply to data before 2004.

REEL_NBR      

REEL NUMBER

NON-LABELED VARIABLE -- Internal use only

NOTE: (1) This variable was added in 1990 to aid Illinois DOT in the location of accident report forms. (2) Variable discontinued in 1995.

RODWYCLS      

ROADWAY CLASSIFICATION

• '01' = 'URBAN FREEWAYS'
• '02' = 'URBAN FREEWAYS < 4 LANE'
• '03' = 'URBAN 2 LANE ROADS'
• '04' = 'URBAN MULTILANE DIVIDED NON FREEWAYS'
• '05' = 'URBAN MULTILANE UNDIVIDED NON FREEWAYS'
• '06' = 'RURAL FREEWAYS'
• '07' = 'RURAL FREEWAYS < 4 LANE'
• '08' = 'RURAL 2 LANE ROADS'
• '09' = 'RURAL MULTILANE DIVIDED NON FREEWAYS'
• '10' = 'RURAL MULTILANE UNDIVIDED NON FREEWAYS'
• '99' = 'OTHERS'

RRX_ALP       

RR CROSSING ALPA NBR

NON-LABELED VARIABLE

NOTE: 99 per cent of observations coded as missing.

RRX_NBR       

RAILROAD CROSSING NUMBER

NON-LABELED VARIABLE

NOTE: 99 per cent of observations coded as missing.

RTE_NBR       

ROUTE NUMBER

NON-LABELED VARIABLE

RTE_PREF      

ROUTE PREFIX - ACCIDENT VAR

• . = 'NOT CODED'
• 1 = 'U.S. ROUTE'
• 2 = 'INTERSTATE BUSINESS ROUTE'
• 3 = 'BUSINESS U.S. ROUTE'
• 4 = 'BYPASS U.S. ROUTE'
• 5 = 'ILLINOIS ROUTE'
• 6 = 'ALTERNATE ILLINOIS ROUTE'
• 7 = 'BUSINESS ILLINOIS ROUTE'
• 8 = 'STATE MAINTAINED ROUTE'
• 9 = 'INTERSTATE ROUTE'
• 0 = 'NOT MARKED'
• OTHER = 'ERROR CODES'

NOTE: Variable added in 1994.

RTE_TYPE      

ROUTE TYPE

• 1 = 'FEDERAL-AID INTERSTATE'
• 2 = 'FEDERAL-AID PRIMARY'
• 3 = 'FEDERAL-AID SECONDARY'
• 4 = 'STATE BOND ISSUE'
• 5 = 'COUNTY HIGHWAY'
• 6 = 'HOUSE OR SENATE BILL'
• 7 = 'TOWNSHIP OR ROAD DISTRICT ROAD'
• 8 = 'OTHER ROAD'
• 9 = 'FEDERAL-AID URBAN'
• 0 = 'MUNICIPAL STREET'

NOTE: Variable discontinued in 1994.

SEV_CDE       

ACCIDENT SEVERITY

• . = 'NOT CODED'
• 1 = 'FATAL'
• 2 = 'INJURY'
• 3 = 'PROPERTY DAMAGE ONLY'

SEVERITY      

COLLISION SEVERITY

• . = 'NOT CODED'                   
• 0 = 'NO INJURY'                   
• 1 = 'A (INCAPACITATING) INJURY - INJURY OTHER THAN FATAL REQUIRING HOSPITALIZATION'
• 2 = 'B (NON-INCAPACITATING) INJURY - INJURY EVIDENT TO OTHERS AT SCENE'
• 3 = 'C (POSSIBLE) INJURY - NO VISIBLE INJURY BUT COMPLAINT OF PAIN'
• 4 = 'FATAL'
• OTHER= 'ERROR CODES'

NOTE: This variable is not found in the Raw File. It was developed to produce more detail than the "severity code" (SEV_CDE) that has only three categories -- none, injury, fatal. The accident severity is based on the most severe occupant injury in the accident.

TC_COND       

TRAFFIC CONTROL CONDITION

• 1 = 'NO TRAFFIC CONTROLS'
• 2 = 'TRAFFIC CONTROL DEVICE NOT FUNCTIONING'
• 3 = 'IMPROPER FUNCTIONING OF TRAFFIC CONTROL DEVICE'
• 4 = 'PROPER FUNCTIONING OF THE CONTROL DEVICE'
• 5 = 'REFLECTING MATERIAL WORN OUT'
• 6 = 'MISSING DATA'
• 7 = 'OTHER'
• 9 = 'UNKNOWN'

NOTE: Variable added in 1994.

TOT_INJ       

OCCUPANTS INJURED

• .     = 'NOT CODED'
• 00    = '00'
• 01    = '01'
• 02    = '02'
• 03    = '03'
• 04    = '04'
• 05-10 = '05 TO 10'
• 11-20 = '11 TO 20'
• 21-50 = '21 TO 50'
• OTHER = 'ERROR CODES'

TOT_KILL      

OCCUPANTS KILLED

• .     = 'NOT CODED'
• 00    = '00'
• 01    = '01'
• 02    = '02'
• 03    = '03'
• 04    = '04'
• 05-10 = '05 TO 10'
• 11-20 = '11 TO 20'
• 21-50 = '21 TO 50'
• OTHER = 'ERROR CODES'

TOT_NON       

TOTAL NUMBER OF UNINJURED PERSONS

• 0 - 4 = ACTUAL NUMBER
• 5 - 10 = '5 - 10'
• 11 - 20 = '11 - 20'
• 21 - 50 = '21 - 50'

TOTAINJ       

NUM A INJ IN ACC

TOTBINJ       

NUM B INJ IN ACC

TOTCINJ       

NUM C INJ IN ACC

• .     = 'NOT CODED'
• 00    = '00'
• 01    = '01'
• 02    = '02'
• 03    = '03'
• 04    = '04'
• 05-10 = '05 TO 10'
• 11-20 = '11 TO 20'
• 21-50 = '21 TO 50'
• OTHER = 'ERROR CODES'

TOWNSHIP      

TOWNSHIP

NON-LABELED VARIABLE

TRFCNTL       

TYPE OF TRAFFIC CONTROL

• 00 = 'NOT STATED'
• 01 = 'NO CONTROLS'
• 02 = 'STOP SIGN/FLASHER'
• 03 = 'TRAFFIC SIGNAL'
• 04 = 'YIELD'
• 05 = 'POLICE/FLAGMAN'
• 06 = 'RR CROSSING GATE'
• 07 = 'OTHER RR CROSSING'
• 08 = 'SCHOOL ZONE'
• 09 = 'NO PASSING'
• 10 = 'OTHER REGULATORY SIGN'
• 11 = 'OTHER WARNING SIGN'
• 12 = 'LANE USE MARKING'
• 13 = 'OTHER'
• 15 = 'YELLOW FLASHER'             
• 16 = 'OTHER CONTROL'              
• 99 = 'UNKNOWN'

NOTE: Categories 15-16 apply to data before 2004.

WEATHER       

WEATHER

• ., 0 = 'NOT STATED'
• 1 = 'CLEAR'
• 2 = 'RAIN'
• 3 = 'SNOW'
• 4 = 'FOG/SMOKE/HAZE'
• 5 = 'SLET/HAIL'
• 6 = 'SEVERE CROSS WIND'
• 7 = 'OTHER'
• 8 = 'BLOWING SNOW'                
• 9 = 'UNKNOWN'

NOTE: Category 8 applies to data before 2004.

WEEKDAY       

DAY OF OCCURRENCE

• . = 'NOT CODED'
• 1 = 'MONDAY'
• 2 = 'TUESDAY'
• 3 = 'WEDNESDAY'
• 4 = 'THURSDAY'
• 5 = 'FRIDAY'
• 6 = 'SATURDAY'
• 7 = 'SUNDAY'
• OTHER = 'ERROR CODES'

NOTE: Variable discontinued in 2001.

WRK_ZONE_REL  

WORKZONE RELATED

• 'Y' = 'YES'
• 'N' = 'NO'

NOTE: Variable added in 2006.

Vehicle Subfile

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE ILLINOIS STATE VEHICLE SUBFILE

ACTION        

ARREST

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1997.

AIRBAG        

DRIVER AIRBAG DEPLOYED

• '1' = 'WITH SEAT BELT'
• '2' = 'WITHOUT SEAT BELT'
• '9' = 'UNKNOWN/NOT APPLICABLE'

NOTE: (1) See DRV_REST. (2) Variable added in 1996.

AT_FAULT      

AT FAULT

NON-LABELED VARIABLE

NOTE: Variable added in 1994.

CASENO        

ACCIDENT CASE NUMBER

NON-LABELED VARIABLE -- CASE NUMBER

COL_TYPE      

COLLISION TYPE

NON-LABELED VARIABLE

NOTE: Variable added in 1994.

COMM_VEH      

COMMERCIAL VEHICLE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

DIR_TRVL      

DIRECTION OF TRAVEL

• . = 'NOT CODED'
• 0 = 'NOT STATED'
• 1 = 'NORTH'
• 2 = 'NORTHEAST'
• 3 = 'EAST'
• 4 = 'SOUTHEAST'
• 5 = 'SOUTH'
• 6 = 'SOUTHWEST'
• 7 = 'WEST'
• 8 = 'NORTHWEST'
• OTHER = 'ERROR CODES'

NOTE: This appears to refer to direction immediately prior to impact rather than initial direction.

DRV_ACTN      

DRIVER ACTION

• '01' = 'NONE'
• '02' = 'FAILED TO YIELD'
• '03' = 'DISREGARD CONTROL DEVICE'
• '04' = 'TOO FAST FOR CONDITIONS'
• '05' = 'IMPROPER TURN'
• '06' = 'WRONG WAY OR SIDE'
• '07' = 'FOLLOWED TOO CLOSELY'
• '08' = 'IMPROPER LANE CHANGE'
• '09' = 'IMPROPER BACKING'
• '10' = 'IMPROPER PASSING'
• '11' = 'IMPROPER PARKING'
• '12' = 'LICENSE RESTRICTIONS'
• '13' = 'STOPPED SCHOOL BUS'
• '14' = 'EMERGENCY VEHICLE ON CALL'
• '15' = 'EVADING POLICE VEHICLE'
• '16' = 'OTHER'                    
• '99','00' = 'UNKNOWN/NOT STATED'
• ' ','.'  = 'NOT CODED'

NOTE: Variable added in 1994.

DRV_AGE       

DRIVER AGE

• .     = 'NOT CODED'
• 00,99 = 'UNKNOWN'
• 01    = '0  - 01 YRS'
• 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'
• 66-98 = '66 +    YRS'
• OTHER = 'ERROR CODES'

DRV_BAC       

DRIVER ALCOHOL PERCENT

• . = 'NOT CODED'
• 0 = 'NOT STATED, NOT TAKEN OR NONE'
• 1 = '0.00'
• 2 = '0.01 - 0.05'
• 3 = '0.06 - 0.07'
• 4 = '0.08 - 0.09'
• 5 = '0.10 - 0.14'
• 6 = '0.15 - 0.19'
• 7 = '0.20 - OVER'
• OTHER= 'ERROR CODES'

NOTE: (1) Test results are provided for only approximately 67% of Drivers noted as having been tested under DRIVER SOBRIETY TEST. This variable was combined with SOB_TEST on July 1, 1993. See DRV_BAC2. (2) Variable discontinued in 1993

DRV_BAC2      

2ND TEST RESULTS

• '00',' .',' 0'  = 'NOT STATED, NOT TAKEN OR NONE'
• ' 1'-' 9','10'-'94' = 'TEST VALUE'
• '95' = 'TEST REFUSED'
• '96' = 'TEST N/OFFERED'
• '97' = 'TEST PERFORMED, RESULTS UNKNOWN'
• '99' = 'UNKNOWN'

NOTE: (1) Test results are provided for only approximately 67% of Drivers noted as having been tested under DRIVER SOBRIETY TEST. This variable was new as of July 1, 1993, combining information from DRV_BAC and SOB_TEST. (2)Variable added in 1993.

DRV_CLAS      

DRIVER CLASS

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

DRV_COND      

DRIVER CONDITION NEW

• '1' = 'NORMAL'
• '2' = 'IMPAIRED-ALCOHOL'
• '3' = 'IMPAIRED-DRUGS'
• '4' = 'ILLNESS'
• '5' = 'ASLEEP/FAINTED'
• '6' = 'MEDICATED'
• '7' = 'HAD BEEN DRINKING'
• '8' = 'FATIGUED'
• '9' = 'OTHER/UNKNOWN'

NOTE: Variable added in 1996.

DRV_DOB       

DRIVER BIRTHDATE

NON-LABELED VARIABLE

NOTE: This variable contains a date with the following format MMDDYYYY.

DRV_EJCT      

DRIVER EJECTION

• '1' = 'NOT APPLICABLE'
• '2' = 'TOTALLY EJECTED'
• '3' = 'PARTIALLY EJECTYD'
• '4' = 'TRAPPED/EXTRICD'           
• '9' = 'UNKNOWN'
• ' ' = 'NOT CODED'

NOTE: Variable added in 1994.

DRV_IMAG      

IMAGE NUMBER

NON-LABELED VARIABLE -- Internal use only

NOTE: (1) This variable was added in 1990 to aid Illinois DOT in the location of accident report forms. (2) Variable discontinued in 1995.

DRV_INJ       

DRIVER EXTENT OF INJURY

• . = 'NOT CODED'
• 0 = 'NO INJURY'
• 1 = 'C (POSSIBLE) INJURY - NO VISIBLE INJURY BUT COMPLAINT OF PAIN'
• 2 = 'B (NON-INCAPACITATING) INJURY - INJURY EVIDENT TO OTHERS AT SCENE'
• 3 = 'A (INCAPACITATING) INJURY - INJURY OTHER THAN FATAL REQUIRING HOSPITALIZATION'
• 4 = 'FATAL'
• OTHER= 'ERROR CODES'

DRV_LST       

DRIVER LICENSE STATE

NON-LABELED VARIABLE

NOTE: Variable added in 1996.

DRV_REEL      

REEL NUMBER

NON-LABELED VARIABLE -- Internal use only

NOTE: (1) This variable was added in 1990 to aid Illinois DOT in the location of accident report forms. (2) Variable discontinued in 1995.

DRV_REST      

DRIVER RESTRAINT USAGE

• .,00 = 'NOT CODED'
• 01   = 'NONE PRESENT'
• 02   = 'SAFETY BELT USED'
• 03   = 'SAFETY BELT NOT USED'
• 04   = 'HELMET USED'
• 05   = 'HELMET NOT USED'
• 06   = 'CHILD RESTRAINT USED'
• 07   = 'CHILD RESTRAINT USED IMPROPERLY'
• 08   = 'CHILD RESTRAINT NOT USED'
• 09   = 'USAGE UNKNOWN'
• 10   = 'AIR BAG ACTIVT'           
• 11   = 'BAG DEPL BLT US'          
• 12   = 'BAG DEPL BLT N/US'        
• 99   = 'OTHER'                    

NOTE: (1) See “AIRBAG” for airbag data for 1996 and later years (2) This variable has a very high number of “not stated” codes and is characterized in general by poor data for years 1985 – 1991. (3) Categories 10-12 and 99 apply to data before 2004.

DRV_RPT       

DRIVER REPORT

• 1 = 'DRV AT FAULT'
• 0 = 'NOT AT FAULT'
• . = 'NOT CODED'
• OTHER = 'ERROR CODES'

NOTE: Variable discontinued in 1997.

DRV_SEX       

DRIVER SEX

• . = 'NOT CODED'
• 0 = 'NOT STATED'                  
• 1 = 'MALE'                        
• 2 = 'FEMALE'                      
• 3 = 'DRIVERLESS'                  
• 4 = 'MALE - PARKED VEHICLE - INJURED ONLY'
• 5 = 'FEMALE - PARKED VEHICLE - INJURED ONLY'
• 6 = 'NOT STATED - PARKED VEHICLE'
• OTHER ='ERROR CODES'

F_INVLOC      

INVOLVEMENT LOCATION

• . = 'NOT CODED'
• 01 = 'ON PAVEMENT (ROADWAY)'
• 02 = 'OFF PAVEMENT - LEFT'
• 03 = 'OFF PAVEMENT - RIGHT'
• 04 = 'INTERSECTION'
• 05 = 'OTHER'
• 07 = 'SHLDR LEFT'                 
• 08 = 'SHLDR RIGHT'                
• 09 = 'UNKNOWN'
• 10 = 'MERGING AREA'               
• 11 = 'DIVERGING AREA'             
• 12 = 'IN CROSSWALK'               
• 13 = 'N/CSWK, WLK GRD'            
• 14 = 'N/CSWK, N/WLK GRD'          
• 17 = 'MAIN RDWY SAME'             
• 18 = 'MAIN RDWY OPPS'             
• 19 = 'MEDIAN'
• OTHER = 'ERROR CODE'

NOTE: Categories 7, 8, 10-14 and 17-19 apply to data before 2004.

FIRE          

VEH FUEL LEAKS AND FIRES

• . = 'NOT CODED'
• 0 = 'NOT STATED'                  
• 1 = 'YES'                         
• 2 = 'NO'                          
• OTHER ='ERROR CODES'

NOTE: Over 9 percent coded as "not stated".

FRST_INV      

FIRST INVOLVEMENT

• .,00   = 'NOT CODED'
• 01  = 'RAN OFF THE ROADWAY'
• 02  = 'OVERTURN'
• 03  = 'FIRE/EXPLOSION'
• 04  = 'IMMERSION'
• 05  = 'JACKKNIFE'
• 06  = 'CARGO SHFT/LOSS'
• 07  = 'SEPARATION OF UNT'
• 08  = 'DOWNHILL RUNWAY'
• 09  = 'OTHER NON COLLISION'
• 11  = 'MOTOR VEHICLE IN TRAFFIC'
• 12  = 'PEDESTRIAN'
• 13  = 'PEDALCYCLIST'
• 14  = 'RAILWAY TRAIN'
• 15  = 'DEER'
• 16  = 'OTHER ANIMAL'
• 17  = 'FALLING LOAD'
• 18  = 'PARKED VEHICLE'
• 19  = 'THROWN/FALLING OBJECT'
• 20  = 'OTHER OBJECT'
• 21  = 'CRASH CUSSION'
• 22  = 'GUARDRAIL FACE'
• 23  = 'GUARDRAIL END'
• 24  = 'CONCRETE MEDIAN BARRIER'
• 25  = 'BRIDGE SUPPORT'
• 26  = 'BRIDGE END'
• 27  = 'BRIDGE RAIL'
• 28  = 'BRIDGE UNDERSIDE'
• 29  = 'TRAFFIC SIGNAL'
• 30  = 'LIGHT SUPPORTS'
• 31  = 'UTILITY POLE'
• 32  = 'DELINEATOR POST'
• 33  = 'RAILROAD SIGNAL/GATES'
• 34  = 'OTHER POLE OR POST'
• 35  = 'CULVERT'
• 36  = 'CURB'
• 37  = 'DITCH/EMBANKMENT'
• 38  = 'SNOWBANK'
• 39  = 'FENCE'
• 40  = 'MAILBOX'
• 41  = 'TREE OR SHRUB'
• 42  = 'BUILDING/STRUCTURE'
• 43  = 'OTHER FIXED OBJECT'
• 44  = 'MEDIAN WIRE'
• 51  = 'REAREND BOTH MOV'          
• 52  = 'REAR END 1 STOP'           
• 53  = 'HEADON'                    
• 54  = 'SIDSWP SAME DIR'           
• 55  = 'SIDSWP OPPOSIT'            
• 56  = 'ANGLE'                     
• 57  = 'TURNING'                   
• 58  = 'OTHER'                     
• 59  = 'GUARDRAIL'                 
• 60  = 'HIGHWAY SIGN'              
• 61  = 'BRIDGE/GUARDRAIL'          
• 62  = 'GRDL ON BRDG APR'          
• 63  = 'ADVERTISING SIGN'          
• 64  = 'MEDIAN FENCE'              
• 65  = 'BARRICADE'                 
• 66  = 'MACHINERY'                 
• 67  = 'WATER HYDRANT'             
• 68  = 'BLANK'                     
• 69  = 'EMBANKMENT'                
• 70  = 'BIRD'                      
• 99  = 'UNKNOWN'
• OTHER = 'ERROR CODES'

NOTE: Categories 51-70 apply to data before 2004.

HZM_IND       

HAZARDOUS MATERIAL

• '0' = 'NOT STATED'                
• '1' = 'YES'                       
• '2' = 'NO'                        
• ' ' = 'NOT CODED'

NOTE: Variable added in 1994.

INTOX         

ALCOHOL INVOLVED

• ' ' = 'NOT CODED'
• '0' = 'NOT STATED'                
• '1' = 'NO EVIDENCE OF DRINKING'
• '2' = 'DRINKING, ABILITY IMPAIRED'
• '3' = 'DRINKING, ABILITY NOT IMPAIRED'
• '4' = 'UNDETERMINED IMPAIRMENT'
• OTHER = 'ERROR CODES'

NOTE: (1) Data is very limited and very inaccurate. Illinois recommends that these data not be used in analyses. (2) Variable discontinued in 1995.

MISCACT1      

DRV MISC ACTN 1 CD

• .  = 'NOT CODED'
• 00 = 'NONE'
• 01 = 'GOING STRAIGHT AHEAD'
• 02 = 'PASSING OR OVERTAKING ON LEFT'
• 03 = 'MAKING LEFT TURN'
• 04 = 'MAKING RIGHT TURN'
• 05 = 'MAKING U TURN'
• 06 = 'STOPPED FOR TRAFFIC CONTROL'
• 07 = 'ENTERING OR LEAVING PARKING POSITION'
• 08 = 'RIGHT TURN ON RED'
• 09 = 'BACKING'
• 10 = 'DOUBLE OR ILLEGALLY PARKED'
• 11 = 'LEGALLY PARKED'
• 12 = 'SLOWING FOR TRAFFIC CONTROL'
• 13 = 'SKIDDING DUE TO ROAD CONDITION'
• 14 = 'STOPPED FOR LEFT TURN'
• 15 = 'STOPPED FOR RIGHT TURN'
• 16 = 'BEING TOWED OR PUSHED'
• 17 = 'START IN TRAFFIC'
• 18 = 'MERGING INTO TRAFFIC FROM RAMP'
• 19 = 'DIVERGING FROM TRAFFIC TO ENTER RAMP'
• 20 = 'CHANGING TRAFFIC LANE'
• 21 = 'DISABLED OR STALLED ON ROADWAY OR ALLEY'
• 22 = 'SLOWING FOR TURN'
• 23 = 'ENTER OR EXIT SHOULDER AREA'
• 24 = 'PASSING OR OVERTAKING ON RIGHT'
• 25 = 'EMERGENCY VEHICLE ON DUTY CALL'
• 26 = 'EVADING POLICE VEHICLE'
• 27 = 'HIT AND RUN'
• 28 = 'STOP OR SLOW TO PICK UP OR DISCHARGE PASSENGER'
• 29 = 'FORCED OFF ROAD BY VEHICLE'
• 30 = 'LOST CONTROL DUE TO WIND'
• 31 = 'STOPPED IN TRAFFIC'
• 32 = 'DRIVING WRONG WAY'
• 33 = 'ROLLING'
• 34 = 'EMERGENCY STOP ON SHOULDER'
• 35 = 'STALLED DUE TO WEATHER'
• 36 = 'ENTERING ROADWAY FROM A PARKING SPACE/SHOULDER'
• 37 = 'LEAVING ROADWAY TO PARK/SHOULDER'
• 38 = 'ENTERING TRAFFIC FROM DRIVEWAY OR ALLEY'
• 39 = 'DRIVERLESS VEHICLE'
• 40 = 'ANIMAL'
• 41 = 'BICYCLE'
• 42 = 'CONSTRUCTION AREA (BARRICADE, ETC.)'
• 43 = 'EMERGENCY EQUIPMENT'
• 44 = 'FARM TRACTOR/EQUIPMENT'
• 45 = 'FOREIGN OBJECT OR MATERIAL'
• 46 = 'PEDESTRIAN'
• 47 = 'PREVIOUS ACCIDENT'
• 48 = 'RAILROAD CROSSING'
• 49 = 'SCHOOL BUS'
• 50 = 'TRAFFIC REGULATOR'
• 61 = 'CHANGING LANES'
• 62 = 'FROM CROSSROAD'
• 63 = 'OUT OF CONTROL'
• 64 = 'TURNING'
• 65 = 'SLOWING OR STOPPED'
• 66 = 'STALLED OR DISABLED'
• 67 = 'ONCOMING'
• OTHER = 'ERROR CODES'

MOSTHARM      

VEHICLE MOST HARMFUL INVOLVEMENT

• '1' = 'FIRST INVOLVEMENT'
• '2' = 'SECOND INVOLVEMENT'
• '3' = 'THIRD INVOLVEMENT'

NOTE: Variable added in 2006.

NUM_K         

TOTAL KILLED IN VEHICLE

• 0 - 4 = '00 TO 04'
• 05 - 10 = '05 TO 10'
• 11 - 20 = '11 TO 20'
• 21 - 50 = '21 TO 50'

NUM_OCC       

NUMBER OF OCCUPANTS IN VEH

• '05' - '10' = '05 TO 10'
• '11' - '20' = '11 TO 20'
• '21' - '50' = '21 TO 50'

NOTE: Variable added in 1994.

NUMINJ        

TOTAL NUMBER INJURED IN VEHICLE

• .     = 'NOT CODED'
• 00    = '00'
• 01    = '01'
• 02    = '02'
• 03    = '03'
• 04    = '04'
• 05-10 = '05 TO 10'
• 11-20 = '11 TO 20'
• 21-50 = '21 TO 50'
• OTHER = 'ERROR CODES'

PED_AGE       

PEDESTRIAN AGE

• '00','99' = 'UNKNOWN'
• '01' = '0 TO 01 YRS'
• '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'-'98' = '66 + YRS'

NOTE: Variable added in 1995.

PED_CLT       

PEDESTRIAN TYPE OF CLOTHING

• '1' = 'NO CNTR CLOTHING'
• '2' = 'CNTR CLOTHING'
• '3' = 'REFLECT MAT'
• '4' = 'OTHER LIGHT USED'
• ' ' = 'NOT CODED'

NOTE: Variable added in 1994 and discontinued in 2004.

PED_FLAG      

PEDESTRIAN FLAG

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

PED_LOC       

PED/PEDAL LOCATION

• '1' = 'IN ROADWAY'
• '2' = 'IN CROSSWALK'
• '3' = 'NOT IN AVAILABLE CROSSWALK'
• '4' = 'CROSSWALK NOT AVAILABLE'
• '5' = 'DRIVEWAY ACCESS'
• '6' = 'NOT IN ROADWAY'
• '9' = 'UNKNOWN/NA'

NOTE: Variable added in 2006.

PED_OTH       

PEDESTRIAN/OTHER

• . = 'NOT CODED'
• 1 = 'PEDESTRIAN'                  
• 2 = 'EQUESTRIAN'                  
• 3 = 'PEDALCYCLIST'                
• 4 = 'NON-MOTOR VEHICLE - OCCUPANT'
• OTHER= 'ERROR CODES'

NOTE: (1) This variable is used to define units other than motor vehicles. It is left blank if the unit in question is a motor vehicle. (2) Variable discontinued in 2004.

PED_VIS       

DRIVER VISION

• '1'  = 'NOT OBSCURED'
• '2'  = 'WINDSHIELD (WATER/ICE)'
• '3'  = 'TREES, PLANTS'
• '4'  = 'BUILDINGS'
• '5'  = 'EMBANKMENT'
• '6'  = 'SIGNBOARD'
• '7'  = 'HILLCREST'
• '8'  = 'PARKED VEHICLES'
• '9'  = 'MOVING VEHICLE'
• '10' = 'BLINDED - HEADLIGHTS'
• '11' = 'BLINDED - SUNLIGHT'
• '12' = 'BLOWING MATERIALS'
• '13' = 'OTHER'
• '99' = 'UNKNOWN'

NOTE: Variable added in 2006.

PEDACT        

PED/PEDALCYCLIST ACTION/MOVEMENT

• .  = 'NOT CODED'
• 00 = 'NOT STATED'
• 01 = 'CROSSING @ INTERSECTION WITH SIGNAL'
• 02 = 'CROSSING @ INTERSECTION AGAINST SIGNAL'
• 03 = 'CROSSING @ INTERSECTION NO SIGNAL'
• 04 = 'CROSSING NOT @ INTERSECTION'
• 05 = 'COMING FROM BEHIND PARKED VEHICLE'
• 06 = 'WALKING IN ROADWAY - WITH TRAFFIC'
• 07 = 'WALKING IN ROADWAY - AGAINST TRAFFIC'
• 08 = 'PLAYING IN ROADWAY'
• 09 = 'WORKING IN ROADWAY'
• 10 = 'NOT IN ROADWAY'
• 11 = 'OTHER IN ROADWAY'
• 12 = 'PEDESTRIAN INVOLVED IN ACCIDENT WITHIN 50 FT OF SCHOOL BUS'
• OTHER= 'ERROR CODES'

NOTE: These codes are present only for units, which are not motor vehicles, i.e., when PED_OTH is coded as 1, 2, 3, or 4.

PERSON_TYP    

PERSON TYPE

• 1 = 'DRIVER'
• 2 = 'PEDESTRIAN'
• 3 = 'PEDALCYCLIST'
• 4 = 'EQUESTRIAN'
• 5 = 'OCCUPANT OF NONMOTORIZED VEHICLE'
• 6 = 'NONCONTACT VEHICLE'
• 7 = 'PASSENGER'

NOTE: Variable added in 2006.

PHYSCOND      

CONDITION OF DRIVER

• .  = 'NOT CODED'
• 0 = 'NOT STATED DRIVERLESS OR PARKED'
• 1 = 'PHYSICAL DEFECT OR DISABILITY'
• 2 = 'ILLNESS TEMPORARY'
• 3 = 'ASLEEP OR FAINTED'
• 4 = 'MEDICATED'
• 5 = 'NORMAL'
• 6 = 'DISTRACTED'
• 7 = 'PREOCCUPIED'
• 8 = 'OTHER'
• 9 = 'HAD BEEN DRINKING'
• 10 = 'ABILITY IMPAIRED - ALCOHOL'
• 11 = 'ABILITY IMPAIRED - DRUGS'
• 12 = 'FELL ASLEEP, FAINTED'
• 13 = 'FATIGUED'

NOTE: (1) “Not stated” appears to be absent from 1994 onwards data. In addition, the percentage of “had been drinking” appears to be lower than expected. (2) Variable discontinued in 2004.

PTCONT1       

POINT OF CONTACT #1

• ' .' = 'NOT CODED'
• '00' = 'NONE'
• '01' = 'FRONT'
• '02' = 'FRONT RGHT SDE'
• '03' = 'RIGHT SDE'
• '04' = 'REAR RGHT SDE'
• '05' = 'REAR'
• '06' = 'REAR LFT SDE'
• '07' = 'LEFT SIDE'
• '08' = 'FRONT LFT SDE'
• '09' = 'TOP'
• '10' = 'UNDER CARRIAGE'
• '11' = 'TOTAL (MULTI)'
• '12' = 'OTHER'
• '99' = 'UNKNOWN'
• OTHER = 'ERROR CODES'

NOTE: Variable added in 1994.

REPORT        

REPORTABLE ACCIDENT

• ' ' = 'NOT STATED'                
• '1' = 'TOTAL DAMAGE OVER $250'    
• '2' = 'TOTAL DAMAGE UNDER $250'
• OTHER  = 'ERROR CODES'

NOTE: Variable added in 1988.

RESIDLOC      

RESIDENCE OF DRIVER

• . = 'NOT CODED'
• 0 = 'NOT STATED OR DRIVERLESS'
• 1 = 'LOCAL RESIDENT OF CITY IN WHICH ACCIDENT OCCURRED'
• 2 = 'LOCAL RESIDENT OF COUNTY IN WHICH ACCIDENT OCCURRED'
• 3 = 'RESIDING ELSEWHERE IN STATE'
• 4 = 'NON-RESIDENT OF STATE'
• OTHER= 'ERROR CODES'

NOTE: Variable discontinued in 2004.

S_INVLOC      

SECOND INVOLVEMENT LOCATION

Coding -- See F_INVLOC. Notes for F_INVLOC apply here too.

SND_INV       

SECOND INVOLVEMENT

CODING -- SEE FRST_INV. Notes for FRST_INV apply here too.

SOB_TEST      

FIRST SOBRIETY/CONDITION

• . = 'NOT CODED'
• 0 = 'NOT STATED'
• 1 = 'TEST OFFERED AND TAKEN'
• 2 = 'TEST OFFERED AND REFUSED'
• 3 = 'TEST NOT OFFERED'
• 4 = 'VOLUNTEERED AND GIVEN TEST'
• 5 = 'CORONER BLOOD-ALCOHOL REPORT'
• OTHER= 'ERROR CODES'

NOTE: (1) This variable was combined with DRV_BAC on July 1, 1993. See DRV_BAC2. (2) Variable discontinued in 1995.

SPEC_VEH      

SPECIAL VEHICLE

•  1 = 'NOT IN USE'
•  2 = 'PERSONAL'
•  3 = 'DRIVER EDUCATION'
•  4 = 'AMBULANCE'
•  5 = 'FIRE'
•  6 = 'POLICE'
•  7 = 'SCHOOL BUS'
•  8 = 'CTA (CHICAGO TRANSIT AUTHORITY)'
•  9 = 'MASS TRANSIT'
• 10 = 'OTHER TRANSIT'
• 11 = 'MILITARY'
• 12 = 'AGRICULTURE'
• 13 = 'TOW TRUCK'
• 14 = 'CONSTRUCTION/MAINTENANCE'
• 15 = 'HOUSE TRAILER'
• 16 = 'CAMPER/RV - TOWED/MULTI-UNIT'
• 17 = 'CAMPER/RV - SINGLE UNIT'
• 18 = 'TAXI/FOR HIRE'
• 20 = 'COMMERCIAL - MULTI-UNIT'
• 21 = 'COMMERCIAL - SINGLE-UNIT'
• 22 = 'STATE OWNED'
• 31 = 'TRL IN TOW N/SEM'           
• 32 = 'EMERGENCY OTHER'            
• 33 = 'HAZ MATERIAL'               
• 34 = 'HAZ MAT IN TOW'             
• 35 = 'CAMPER / RV'                
• 36 = 'MOBILE HOME / CMPR'         
• 37 = 'SNOWMOBILE'                 
• 38 = 'CYCLE OVR 150 CC'           
• 39 = 'OTHER TRUCK/VEH'            
• 40 = 'MOPED'
• 41 = 'MOTOR WHL CHR'              
• 42 = 'MTRSCOTER U/150CC'          
• 43 = 'MTRSCOTER OVR 150CC'        
• 44 = '4-WHEEL DRIVE'              
• 45 = 'OTHER BUS'                  
• 46 = 'BOBTAIL'                    
• 47 = 'DOUBLE BOTTOM'              
• 48 = 'DOUBLE BOTTOM/HAZ'          
• 49 = 'TRIPLE BOTTOM'              
• 50 = 'TRIPLE BOTTOM/HAZ'          
• 51 = 'STATE POLICE'               
• 98 = 'OTHER'
• 99 = 'UNKNOWN/NA'

NOTE: (1) Data related to vehicles carrying "hazardous materials"(i.e., codes 05 and 06) contain coding errors, particularly the 1985 data. All "hazard materials" data in all three years must be used with caution. In addition, codes were added and definitions changed slightly in 1988. Thus, certain truck-related categories are inconsistent across years. Care must be taken in analyses.  (2) Categories 31-51 apply to data before 2004.

STRK_CDE      

STRIKE STRUCK CODE

• ' ' ='NOT CODED'
• '0' ='NOT STATED'                 
• '1' ='STRIKING VEHICLE'
• '2' ='STRUCK VEHICLE'
• '3' ='BOTH VEHICLES'
• '9' ='UNKNOWN'                    
• OTHER ='ERROR CODES'

NOTE: Over 11 percent coded as "unknown" in early years. Unknown increased to 34% in the 1993 file and 68% in 1994 file. More recent years show values of unknown are close to 15%. Additional "garbage" codes are present.

T_INVLOC      

3RD INVOLVMENT LOCATION

CODING – See F_INVLOC. Notes for F_INVLOC apply here as well.

THRD_INV      

THIRD INVOLVEMENT

CODING -- SEE FRST_INV. Notes for FRST_INV apply here as well.

TOWAWAY       

VEHICLE TOWED

• . = 'NOT CODED'
• 0 = 'NOT STATED'
• 1 = 'NOT TOWED'
• 2 = 'TOWED'
• 3 = 'FIRE'
• OTHER ='ERROR CODES'

NOTE: (1) 1993 data are erroneous due to coding changes. Illinois staff indicates that the problem is in the last six months of 1993. (2) Variable added in 1988.

VEH_MNAU      

VEH MANEUVER CODE

• ' .','00',' ' = 'NOT CODED'
• '01' = 'STRAIGHT AHEAD'
• '02' = 'PASSING/OVERTAKING'
• '03' = 'TURNING LEFT'
• '04' = 'TURNING RIGHT'
• '05' = 'TURNING ON RED'
• '06' = 'U-TURN'
• '07' = 'STARTING IN TRAFFIC'
• '08' = 'SLOW/STOP-LEFT TURN'
• '09' = 'SLOW/STOP-RIGHT TURN'
• '10' = 'SLOW/STOP-LOAD/UNLOAD'
• '11' = 'SLOW/STOP IN TRAFFIC'
• '12' = 'DRIVING WRONG WAY'
• '13' = 'CHANGING LANES'
• '14' = 'AVOIDING VEHICLE/OBJECTS'
• '15' = 'SKIDDING/CONTROL LOSS'
• '16' = 'ENTERING FROM PARKING'
• '17' = 'LEAVING TRAFFIC LANE TO PARK'
• '18' = 'MERGING'
• '19' = 'DIVERGING'
• '20' = 'ENTER FROM DRIVE/ALLEY'
• '21' = 'PARKED'
• '22' = 'PARKED IN TRAFFIC LANE'
• '23' = 'BACKING'
• '24' = 'DRIVERLESS'
• '25' = 'OTHER'
• '26' = 'NEGOTIATING A CURVE'      
• '99' = 'UNKNOWN/NA'               

NOTE: (1) Variable added in 1996. MISCACT1 provides similar information for years prior to 1996. This variable provides information on the vehicle maneuvers of the “vehicles” involved. For information on pedestrian maneuvers refer to variable MISCACT, which has limited information for 2000 and later years. (2) Categories 26 and 99 apply to data from 2004 onwards.

VEH_OCC       

VEHICLE OCCUPANTS

NON-LABELED VARIABLE

NOTE: Variable added in 1994.

VEHCOND1      

VEHICLE DEFECT

• '01' = 'NONE'
• '02' = 'BRAKES'
• '03' = 'STEERING'
• '04' = 'ENGINE/MOTOR'
• '05' = 'SUSPENSION'
• '06' = 'TIRES'
• '07' = 'EXHAUST'
• '08' = 'LIGHTS'
• '09' = 'SIGNALS'
• '10' = 'WINDOWS'
• '11' = 'RESTRAINT SYS'
• '12' = 'WHEELS'
• '13' = 'TRAILER COUPLING'
• '14' = 'CARGO'
• '15' = 'FUEL SYS'
• '99' = 'OTHER'
• ' ', ' .' = 'NOT STATED'

NOTE: Variable added in 1994.

VEHNO         

REFERENCE NUMBER

NON-LABELED VARIABLE

NOTE: This is the number of vehicle on the accident report form. This variable is used to link to occupant file.

VEHTYPE       

TYPE OF VEHICLE

• .  = 'NOT CODED'
• 00 = 'NOT STATED'
• 01 = 'PASSENGER CAR'
• 02 = 'PICKUP TRUCK'
• 03 = 'VAN/MINI-VAN'
• 04 = 'BUS UP TO 15 PASSENGERS'
• 05 = 'BUS OVER 15 PASSENGERS'
• 06 = 'TRUCK - SINGLE UNIT'
• 07 = 'TRACTOR W/ SEMI-TRAILER'
• 08 = 'TRACTOR W/O SEMI-TRAILER'
• 09 = 'FARM EQUIPMENT'
• 10 = 'MOTORCYCLE (OVER 150 CC)'
• 11 = 'MOTOR DRIVEN CYCLE'
• 12 = 'SNOWMOBILE'
• 13 = 'ALL-TERRAIN VEHICLE (ATV)'
• 14 = 'OTHER VEHICLE WITH TRAILER'
• 15 = 'SPORT UTILITY VEHICLE (SUV)'
• 16 = 'OTHER'
• 21 = 'PASSENG CAR SMAL'           
• 22 = 'BUS'                        
• 23 = 'DETACHED TRAILER'           
• 97 = 'OTHER'                      
• 99 = 'UNKNOWN/NA'

NOTE: (1) Code "98" above is not found in the Illinois raw file but has been included in this variable to indicate those records which represent pedestrians, equestrians or pedal cyclists. In addition, use of codes "01" and "02" changed during 1989. The two codes must be collapsed in analyses involving 1989 data. (2) Categories 21-23 and 97 apply to data before 2004.

VEHYR         

VEHICLE MODEL YEAR

• .    = 'NOT CODED'
• 0-80 = 'PRE 1980 MODEL'

VIN           

VINA CODE

NON-LABELED VARIABLE -- No Raw File Documentation

VISION        

VEHICLE VISUAL OBSTRUCTION

• '01' = 'NOT OBSCURED'
• '02' = 'WINDSHIELD (WATER/ICE)'
• '03' = 'TREES, PLANTS'
• '04' = 'BUILDINGS'
• '05' = 'EMBANKMENT'
• '06' = 'SIGNBOARD'
• '07' = 'HILLCREST'
• '08' = 'PARKED VEHICLES'
• '09' = 'MOVING VEHICLES'
• '10' = 'BLINDED - HEADLIGHTS'
• '11' = 'BLINDED - SUNLIGHT'       
• '12' = 'BLOWING MATERIALS (BLOWN RAIN, SNOW)'
• '13' = 'OTHER'                    
• '99','00' = 'UNKNOWN/NOT STATED'
• '  ',' .' = 'NOT CODED'

NOTE: (1) Category 13 applies to data from 2004 onwards. (2) Variable added in 1994.

Injured Occupants Subfile

NOTE: (1) This file only contains data on injured occupants in the vehicle for Years 1985-1992. From 1992 onwards, the file contains injured as well as uninjured occupants.

(2) The 1985 data contains significantly more "no injury" codes than do the 1986 or 1987 files, probably due to a temporary change in coding procedures. The analyst should consider eliminating all cases where "injury severity" (OCC_SEV) is coded as "no injury" in all analysis except those related specifically to children less than age 5.

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

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE ILLINOIS STATE INJURED OCCUPANTS SUBFILE

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

AGE           

OCCUPANT AGE

• .     = 'NOT CODED'
• 00,99 = 'UNKNOWN'
• 01    = '0  - 01 YRS'
• 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'
• 66-98 = '66 +    YRS'
• OTHER = 'ERROR CODES'

CASENO        

ACCIDENT CASE NUMBER

NON-LABELED VARIABLE -- CASE NUMBER

EJCT          

OCCUPANT EJECTION

• '1' = 'NOT APPLICABLE'
• '2' = 'TOTALL EJECTED'
• '3' = 'PARTIALL EJECTD'
• '4' = 'TRAPPED/EXTRICD'
• '9' = 'UNKNOWN'
• ' ' = 'NOT CODED'

NOTE: Variable added in 1994.

INJ           

DRV/OCC INJURY

• . = 'NOT CODED'                   
• 1 = 'C (POSSIBLE) INJURY - NO VISIBLE INJURY BUT COMPLAINT OF PAIN'
• 2 = 'B (NON-INCAPACITATING) INJURY - INJURY EVIDENT TO OTHERS AT SCENE'
• 3 = 'A (INCAPACITATING) INJURY - INJURY OTHER THAN FATAL REQUIRING HOSPITALIZATION'
• 4 = 'FATAL'
• OTHER = 'ERROR CODES'

NOTE: The 1985 data contains significantly more "none" codes than future years, probably due to a temporary change in coding procedures. The analyst should consider eliminating all cases where "injury severity" (OCC_SEV) is coded as "none" in all analysis except those related specifically to children less than age 5.

OCC_AIR       

OCCUPANT AIR BAG

• '1' = 'WITH SEAT BELT'            
• '2' = 'WITHOUT SEAT BELT'         
• '3' = 'NOT APPLICABLE'            
• '4' = 'DID NOT DEPLOY'            
• '5' = 'DEPLOYED, FRONT'           
• '6' = 'DEPLOYED, SIDE'            
• '7' = 'DEPLOYED OTHER (KNEE, AIR BELT, ETC)'
• '8' = 'DEPLOYED, COMBINATION'     
• '9' = 'DEPLOYMENT UNKNOWN/NOT APPLICABLE'       

NOTE: (1) Categories 3-8 apply to data from 2004 onwards. (2) Variable added in 1996.

OCC_IMAG      

IMAGE NUMBER

NON-LABELED VARIABLE

NOTE: (1) This variable was added in 1988 to aid Illinois DOT in the location of accident report forms. (2) Variable added in 1990 and discontinued in 1995.

OCC_REEL      

REEL NUMBER

NON-LABELED VARIABLE

NOTE: (1) This variable was added in 1989 to aid Illinois DOT in the location of accident report forms. (2) Variable added in 1990 and discontinued in 1995.

REST1         

SAFETY EQUIPMENT

• .,00 = 'NOT CODED'
• 01 = 'NONE PRESENT'
• 02 = 'SAFETY BELT USED'
• 03 = 'SAFETY BELT NOT USED'
• 04 = 'HELMET USED'
• 05 = 'HELMET NOT USED'
• 06 = 'CHILD RESTRAINT USED'
• 07 = 'CHILD RESTRAINT USED IMPROPERLY'
• 08 = 'CHILD RESTRAINT NOT USED'
• 09 = 'USAGE UNKNOWN'
• 10 = 'AIR BAG ACTIVT'             
• 11 = 'BAG DEPL BLT US'            
• 12 = 'BAG DEPL BLT N/US'          
• 99 = 'OTHER'                      

NOTE: (1) This variable has a very high number of "not stated" codes and is characterized in general by poor data for years 1985 – 1991. (2) Categories 10-12 and 99 apply to data before 2004.

SEATPOS       

SEATING POSITION

• .  = 'NOT CODED'
• 0  = 'NOT STATED'
• 1  = 'DRIVER'
• 2  = 'CENTER FRONT'
• 3  = 'RIGHT FRONT'
• 4  = 'SECOND ROW LEFT'
• 5  = 'SECOND ROW CENTER'
• 6  = 'SECOND ROW RIGHT'
• 7  = 'ENCLOSED PASSENGER'
• 8  = 'EXPOSED PASSENGER'
• 9  = 'UNKNOWN POSITION'           
• 10 = 'THIRD ROW LEFT'             
• 11 = 'THIRD ROW CENTER'           
• 12 = 'THIRD ROW RIGHT'            
• OTHER= 'ERROR CODES'

NOTE: Categories 9-12 apply to data from 2004 onwards.

SEX           

OCCUPANT SEX

• .  = 'NOT CODED'
• 0  = 'NOT STATED'
• 1  = 'MALE'
• 2  = 'FEMALE'
• OTHER ='ERROR CODES'

VEHNO         

VEHICLE NUMBER

NON-LABELED VARIABLE

NOTE: This is the reference number of vehicle in which this occupant is seated. This variable is used in linkage with vehicle subfile.

Roadlog File

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE ILLINOIS ROADLOG FILE

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

AADT          

ANNUAL ADT

• 00000          = '             0'
• 00001 - 00100  = '   1  -    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 +'

NOTE: Variable added in 1987.

AADT_YR       

YEAR OF AADT

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

ACCESS        

ACCESS CONTROL

• 0 = 'UNCONTROLLED'                
• 1 = 'PARTIAL CONTROL'             
• 2 = 'FULL CONTROL'                

NOTE: Variable added in 1987.

ADMINHWY      

ADMISNISTRATIVE HIGHWAY SYSTEM

• ' ' = 'NOT CODED'
• '1' = 'STATE'                     
• '2' = 'COUNTY'                    
• '3' = 'TOWNSHIP'                  
• '4' = 'MUNICIPAL'                 
• '5' = 'PRIVATE/OTHER'             

NOTE: Variable added in 1997.

APPR_NBR      

APPURTENANCE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

AVAI_ROW      

AVAILABLE R.O.W.

• ' ' = 'NOT CODED'
• '0' = 'UNDETERMINED'
• '1' = 'NOT FEASIBLE'
• '2' = 'LESS THAN ONE LANE FEASIBLE'
• '3' = 'ONE LANE FEASIBLE'
• '4' = 'TWO LANES FEASIBLE'
• '5' = 'MORE THAN TWO LANES FEASIBLE'

NOTE: Variable added in 1997.

BEGMP         

BEGIN MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

BUILD_BY      

BUILT BY

• '0' = 'UNKNOWN'
• '1' = 'STATE (INCLUDES FA ROADS ON STATE SYSTEM)'
• '2' = 'CITY, TOWN OR VILLAGE BY AGREEMENT WITH STATE (I.E. PARTIAL OR TOTAL REFUND)'
• '3' = 'STATE AND COUNTY (WHEN BUILT BY ONE AND WIDENED BY THE OTHER)'
• '4' = 'COUNTY'
• '5' = 'TOWNSHIP OR ROAD DISTRICT'
• '6' = 'CITY, TOWN OR VILLAGE (INCLUDES CITY PARK DISTRICT)'
• '7' = 'PARK DISTRICT OR STATE DIVISION OF PARKS AND MEMORIALS'
• '8' = 'OTHER GOVERNMENTAL UNIT (INCLUDES TOLL COMMISSION, DEPARTMENT OF CONSERVATION, CORP OF ENGINEERS)'
• '9' = 'PRIVATE'
• 'X' = 'PROPOSED OR DESIGNATED ROADS'
• 'A' = 'JOINT-COUNTY AND CITY'

NOTE: Variable added in 2004.

CNTY_RTE      

CNTY RTETYP RTENBR

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

COMM_VOL      

HEAVY COMMERCIAL VOLUME

• 0 = ' 0'
• 000001 - 000100 = ' 1 - 100'
• 000101 - 000500 = ' 101 - 500'
• 000501 - 001000 = ' 501 - 1,000'
• 001001 - 002000 = '1,001 - 2,000'
• 002001 - 005000 = '2,001 - 5,000'
• 005001 - 010000 = '5,001 - 10,000'
• 010001 - 015000 = '10,000- 15,000'
• 015001 - 020000 = '15,001- 20,000'
• 020001 - 040000 = '20,001- 40,000'
• 040001 - 999999 = '40,000 +'

NOTE: Variable added in 1987.

COMMDATE      

DATE

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

COUNTY        

COUNTY

• 001 = 'ADAMS'
• 002 = 'ALEXANDER'
• 003 = 'BOND'
• 004 = 'BOONE'
• 005 = 'BROWN'
• 006 = 'BUREAU'
• 007 = 'CALHOUN'
• 008 = 'CARROLL'
• 009 = 'CASS'
• 010 = 'CHAMPAIGN'
• 011 = 'CHRISTIAN'
• 012 = 'CLARK'
• 013 = 'CLARY'
• 014 = 'CLINTON'
• 015 = 'COLES'
• 016 = 'COOK'
• 017 = 'CRAWFORD'
• 018 = 'CUMBERLAND'
• 019 = 'DEKALB'
• 020 = 'DEWITT'
• 021 = 'DOUGLAS'
• 022 = 'DUPAGE'
• 023 = 'EDGAR'
• 024 = 'EDWARDS'
• 025 = 'EFFINGHAM'
• 026 = 'FAYETTE'
• 027 = 'FORD'
• 028 = 'FRANKLIN'
• 029 = 'FULTON'
• 030 = 'GALLATIN'
• 031 = 'GREENE'
• 032 = 'GRUNDY'
• 033 = 'HAMILTON'
• 034 = 'HANCOCK'
• 035 = 'HARDIN'
• 036 = 'HENDERSON'
• 037 = 'HENRY'
• 038 = 'IROQUOIS'
• 039 = 'JACKSON'
• 040 = 'JASPER'
• 041 = 'JEFFERSON'
• 042 = 'JERSEY'
• 043 = 'JODAVIESS'
• 044 = 'JOHNSON'
• 045 = 'KANE'
• 046 = 'KANKAKEE'
• 047 = 'KENDALL'
• 048 = 'KNOX'
• 049 = 'LAKE'
• 050 = 'LASALLE'
• 051 = 'LAWRENCE'
• 052 = 'LEE'
• 053 = 'LIVINGSTON'
• 054 = 'LOGAN'
• 055 = 'MCDONOUGH'
• 056 = 'MCHENRY'
• 057 = 'MCLEAN'
• 058 = 'MACON'
• 059 = 'MACOUPIN'
• 060 = 'MADISON'
• 061 = 'MARION'
• 062 = 'MARSHALL'
• 063 = 'MASON'
• 064 = 'MASSAC'
• 065 = 'MENARD'
• 066 = 'MERCER'
• 067 = 'MONROE'
• 068 = 'MONTGOMERY'
• 069 = 'MORGAN'
• 070 = 'MOULTRIE'
• 071 = 'OGLE'
• 072 = 'PEORIA'
• 073 = 'PERRY'
• 074 = 'PIATT'
• 075 = 'PIKE'
• 076 = 'POPE'
• 077 = 'PULASKI'
• 078 = 'PUTNAM'
• 079 = 'RANDOLPH'
• 080 = 'RICHLAND'
• 081 = 'ROCK ISLAND'
• 082 = 'ST. CLAIR'
• 083 = 'SALINE'
• 084 = 'SANGAMON'
• 085 = 'SCHUYLER'
• 086 = 'SCOTT'
• 087 = 'SHELBY'
• 088 = 'STARK'
• 089 = 'STEPHENSON'
• 090 = 'TAZEWELL'
• 091 = 'UNION'
• 092 = 'VERMILION'
• 093 = 'WABASH'
• 094 = 'WARREN'
• 095 = 'WASHINGTON'
• 096 = 'WAYNE'
• 097 = 'WHITE'
• 098 = 'WHITESIDE'
• 099 = 'WILL'
• 100 = 'WILLIAMSON'
• 101 = 'WINNEBAGO'
• 102 = 'WOODFORD'

NOTE: Variable added in 1987.

CURB1         

CURB TYPE

• 1 = 'CURB/GUT UND GRD'
• 2 = 'CURB/GUT N/UNDGR'
• 3 = 'UNDGRD DRAIN'
• 4 = 'OPEN DITCH /NAT'
• 0 = 'NO DRAIN PROVIS'

NOTE: Variable added in 1987 and discontinued in 1995.

CURV_CUT      

CURVE CUT

• 'C' = 'CURVE IN A CUT'
• 'F' = 'CURVE IN A FILL'

NOTE: Variable added in 1987 and discontinued in 1995.

CURV_RAD      

CURVE RADIUS

NON LABELED VARIABLE -- Gives the curve radius in feet.

NOTE: (1) For years later to 1997, refer to the CURVE file, which has variables for sections with curves. Also see discussion section for roadlog and curve files. (2) Variable added in 1987.

DEF_ANGL      

DEFLECTION ANGLE

• '0000001' - '0105959' = '01  -  10 DEG'
• '0110000' - '0205959' = '11  -  20 DEG'
• '0210000' - '0305959' = '21  -  30 DEG'
• '0310000' - '0405959' = '31  -  40 DEG'
• '0410000' - '0505959' = '41  -  50 DEG'
• '0510000' - '0605959' = '51  -  60 DEG'
• '0610000' - '0905959' = '61  -  90 DEG'
• '0910000' - '1205959' = '91  - 120 DEG'
• '1210000' - '1805959' = '121 - 180 DEG'

NOTE: Variable added in 1987 and discontinued in 1995.

DIR_CURV      

HORIZONTAL CURVE DIRECTION

• ' ' = 'Not Coded'
• 'L' = 'LEFT'
• 'R' = 'RIGHT'

NOTE: (1) For years later to 1997, refer to the CURVE file, which has variables for sections with curves. (2) Variable added in 1987.

DISTRICT      

ILL-DISTRICT

• 1 = 'SCHAUMBURG'
• 2 = 'DIXON'
• 3 = 'OTTAWA'
• 4 = 'PEORIA'
• 5 = 'PARIS'
• 6 = 'SPRINGFIELD'
• 7 = 'EFFINGHAM'
• 8 = 'FAIRVIEW HEIGHTS'
• 9 = 'CARBONDALE'

NOTE: Variable added in 1987.

END_RTE       

END OF ROUTE

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

ENDMP         

END MILE POST

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

EXST_ROW      

EXISTING RIGHT OF WAY

• .         = 'NOT CODED'
• 000       = 'NO ROW REPORTED'
• 001 - 200 = ' 0 - 200 FT'
• 201 - 400 = '200 - 400 FT'
• 401 - 600 = '400 - 600 FT'
• 601 - 800 = '600 - 800 FT'
• 801 - HIGH = 'MORE THAN 800 FT'

NOTE: (1) Similar to ROW variable available during previous years. (2) Variable added in 1997.

FAUL_HGHT     

FAULT HEIGHT

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

FED_AID       

FEDERAL AID (IN LIEU)

• 01 = 'FEDERAL AID INTERSTATE DESIGNATED'
• 02 = 'FEDERAL AID PRIMARY'
• 03 = 'FEDERAL AID SECONDARY'
• 04 = 'FEDERAL AID URBAN'
• 08 = 'FEDERAL AID INTERSTATE - FEDERAL AID PRIMARY COINCIDING'
• 09 = 'NON-FEDERAL AID'
• 11 = 'FEDERAL AID INTERSTATE COMPLETED'
• 12 = 'FEDERAL AID INTERSTATE TRAVELED WAY ON FEDERAL AID PRIMARY'
• 13 = 'FEDERAL AID INTERSTATE TRAVELED WAY ON FEDERAL AID SECONDARY'
• 18 = 'FEDERAL AID INTERSTATE TRAVELED WAY ON FEDERAL AID INTERSTATE - FEDERAL AID PRIMARY COINCIDING'
• 19 = 'FEDERAL AID INTERSTATE TRAVELED WAY ON NON-FEDERAL AID'
• 23 = 'FEDERAL AID PRIMARY TRAVELED WAY ON FEDERAL AID SECONDARY'
• 29 = 'FEDERAL AID PRIMARY TRAVELED WAY ON NON-FEDERAL AID'
• 39 = 'FEDERAL AID SECONDARY TRAVELED WAY ON NON-FEDERAL AID'
• 83 = 'FEDERAL AID INTERSTATE AND FEDERAL AID PRIMARY TRAVELED WAYS ON FEDERAL AID SECONDARY'

NOTE: Variable added in 1987 and discontinued in 1995.

FUNC_CLS      

FUNCTIONAL CLASS

• .  = 'NOT CODED'
• 10 = 'INTERSTATE'
• 20 = 'FREEWAY AND EXRPESSWAY (URBAN ONLY)'
• 30 = 'OTHER PRINCIPAL ARTERIAL'
• 40 = 'MINOR ARTERIAL (NON-URBAN)'
• 50 = 'MAJOR COLLECTOR (NON-URBAN)'
• 55 = 'MINOR COLLECTOR (NON-URBAN)'
• 60 = 'LOCAL ROAD OR STREET (NON-URBAN)'
• 70 = 'MINOR ARTERIAL (URBAN)'
• 80 = 'COLLECTOR (URBAN)'
• 90 = 'LOCAL ROAD OR STREET (URBAN)'

NOTE: Variable added in 1987.

HOR_BEG       

HORIZONTAL CURVE BEGINNING MILEPOST

NON-LABELED VARIABLE

NOTES: (1) This variable is present in data prior to 1997. For later years refer to the CURVE file, which has variables for sections with curves. Also refer the discussion section, Roadlog file for more information on horizontal curves. (2) Variable added in 1997.

HOR_BEGMP     

HORIZONTAL CURVE BEGIN MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

HOR_END       

HORIZONTAL CURVE ENDING MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

HOR_ENDMP     

HORIZONTAL CURVE END MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

HPMS_IND      

HPMS INDICATOR

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

HPMS_SEC      

HPMS SECTION

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

HPMS_SEG      

HMPS-SECTION SEGMENT

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

HPMS1         

HMPS-SECTION ID

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

INSHTP1       

INSIDE SHOULDER TYPE

• ' ' = 'NOT CODED'
• '0' = 'NOT APPLICABLE'
• '1' = 'EARTH'
• '2' = 'SOD'
• '3' = 'AGGREGATE'
• '4' = 'SURFACE TREATED'
• '5' = 'BITUMINOUS'
• '6' = 'CONCRETE-UNTIED'
• '7' = 'CONCRETE-TIED (ONLY FOR SHOULDER 1)'
• '8' = 'V GUTTER'
• '9' = 'CURB AND GUTTER'

NOTE: (1) This variable is only coded for divided roadway, resulting in a high numbers of un-coded cases. (2) If a road section has different shoulder types on the two inside shoulders, then the shoulder type having the lower numbered code is used. (3) For sections having composite shoulders (e.g., part paved, part sod), this is the type that is adjacent to the travel lane. See INSHTP2 for the other (outer) shoulder type. (4) Variable added in 1987.

INSHTP2       

INSIDE SHOULDER TYPE 2

• ' ' = 'NOT CODED'
• '0' = 'NOT APPLICABLE'
• '1' = 'EARTH'
• '2' = 'SOD'
• '3' = 'AGGREGATE'
• '4' = 'SURFACE TREATED'
• '5' = 'BITUMINOUS'
• '6' = 'CONCRETE-UNTIED'
• '7' = 'CONCRETE-TIED (ONLY FOR SHOULDER 1)'
• '8' = 'V GUTTER'
• '9' = 'CURB AND GUTTER'

NOTE: (1) This variable is only coded for divided roadway, resulting in a high number of high numbers of un-coded cases. This is coded for composite shoulders, and defines the shoulder type not adjacent to the travel lane – the outer shoulder type. See INSHTP1 for inner shoulder type – adjacent to the travel lane. (2) Variable added in 1997.

INSHWD1       

SHOULDER WIDTH FOR INSIDE SHOULDER TYPE 1

• .  = 'NOT CODED'
• 00 = ' 0 FT'
• 01 = ' 1 FT'
• 02 = ' 2 FT'
• 03 = ' 3 FT'
• 04 = ' 4 FT'
• 05 = ' 5 FT'
• 06 = ' 6 FT'
• 07 = ' 7 FT'
• 08 = ' 8 FT'
• 09 = ' 9 FT'
• 10 = '10 FT'
• 11 - HIGH = '>=11 FT'

NOTE: (1) This variable is only coded for divided roadway, resulting in a high number of un-coded cases. This is the full width for shoulders of non-composite (single type) shoulders, and the width of the inner shoulder type – adjacent to the travel lane - for composite shoulders. (2) Variable added in 1987.

INSHWD2       

SHOULDER WIDTH FOR INSIDE SHOULDER TYPE 2

• .  = 'NOT CODED'
• 00 = ' 0 FT'
• 01 = ' 1 FT'
• 02 = ' 2 FT'
• 03 = ' 3 FT'
• 04 = ' 4 FT'
• 05 = ' 5 FT'
• 06 = ' 6 FT'
• 07 = ' 7 FT'
• 08 = ' 8 FT'
• 09 = ' 9 FT'
• 10 = '10 FT'
• 11 - HIGH = '>=11 FT'

NOTE: (1) This variable is only coded for divided roadway, resulting in a high number of un-coded cases. Refer to notes for INSHTP2 for more information. (2) Variable added in 1997.

INT_TYPE      

INTERSECTION FEATURE

• 'A' = 'ACROSS'
• 'L' = 'LEFT'
• 'N' = 'NOT APPLICABLE'
• 'R' = 'RIGHT'
• OTHER = 'ERROR CODES'

NOTE: (1) Variable added in 1989 and discontinued in 1995. (2) The INT_TYPE variable is required for all marked routes and for all unmarked states system routes. It is optional for all other routes.

INV_DIR       

INTERFACE INVENTORY DIRECTION CODE

• 'E' = 'EAST'
• 'N' = 'NORTH'
• 'S' = 'SOUTH'
• 'W' = 'WEST'

NOTE: Variable added in 1997.

KEY_RTE_APPRTE

KEY ROUTE APPURTENANCE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

KEY_RTE_APPURTCD 

KEY ROUTE APPURTENANCE TYPE

• '0' = 'MAINLINE'
• '1' = 'ALTERNATE'
• '2' = 'SPUR'
• '3' = 'WYE'
• '4' = 'RAMP'
• '5' = 'FRONTAGE ROAD'
• '6' = 'TEMPORARY CONNECTOR'
• '7' = 'COLLECTOR-DISTRIBUTOR'

NOTE: Variable added in 2004.

KEY_RTE_SEQNBR

KEY ROUTE SEQUENCE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

KEY_RTE_STATION  

KEY ROUTE STATION

NON-LABELED VARIABLE

NOTE: Variable available only for 2004.

KEY_RTE_SUF_CDE

KEY ROUTE SUFFIX CODE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

KEY_RTE_TYPCD 

KEY ROUTE TYPE CODE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

LANEWID       

AVERAGE LANE WIDTH

• 00    = '00'
• 01-08 = '01 - 08'
• 09-10 = '09 - 10'
• 11-15 = '11 - 15'
• 16-20 = '16 - 20'
• 21-99 = '21 - 99'

NOTE: Variable added in 1987.

LPK_REST      

PARKING RESTRICTIONS LEFT

• ' ' = 'NOT CODED'
• '0' = 'UNDETERMINED'
• '1' = 'NO PARKING'
• '2' = 'PARALLEL PARKING'
• '3' = 'DIAGONAL PARKING'
• '4' = 'OTHER'

NOTE: Variable added in 1997.

LST_SECD      

LATEST CONSTRUC SECTION D

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

LST_SECE      

LATEST CONSTRUC SECTION E

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

LST_UPDT      

DATE OF LAST UPDATE [IN YYYY/MM/DD FORMAT]

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

MAIN_DIS      

MAINTENANCE DISTRICT

• 1 = 'SCHAUMBURG'
• 2 = 'DIXON'
• 3 = 'OTTAWA'
• 4 = 'PEORIA'
• 5 = 'PARIS'
• 6 = 'SPRINGFIELD'
• 7 = 'EFFINGHAM'
• 8 = 'FAIRVIEW HEIGHTS'
• 9 = 'CARBONDALE'

NOTE: Variable added in 1987.

MAIN_SEC      

MAINTENANCE SECTION

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

MAINTENC      

MAINTENANCE RESPONSIBILY

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

MED_TYPE      

MEDIAN TYPE

• 0 = 'NO MEDIAN'                   
• 1 = 'UNPROTECTED - SODDED, TREATED EARTH, OR GRAVEL SURFACE'
• 2 = 'CURBED - RAISED MEDIAN, ANY WIDTH'
• 3 = 'POSITIVE BARRIER - FENCING, RETAINING WALLS, GUARD RAILS, OPEN SPACES BETWEEN ELEVATED FREEWAYS, OR OTHER BARRIERS'
• 4 = 'RUMBLE STRIP OR CHATTER BAR
• 5 = 'PAINTED
• 6 = 'BI-DIRECTIONAL TURN LANES, PAINTED
• 7 = 'MOUNTABLE MEDIAN

NOTE: (1) Category 6 is discontinued from 1994 onwards and appears to be combined with categories 5 and 7. (2) Variable added in 1987.

MEDWID        

MEDIAN WIDTH

• 000     = 'NO WIDTH'
• 001-005 = '001 - 005'
• 006-010 = '006 - 010'
• 011-030 = '011 - 030'
• 031-050 = '031 - 050'
• 051-100 = '051 - 100'
• 101-999 = '> 100'

NOTE: (1) Median width is measured as the width of the portion of the divided highway separating the opposing directions of traffic. It is measured from inside edge of the pavement to the inside edge of the pavement. (2) Variable added in 1987.

MRK_BEG       

MARKED BEGINNING

NON-LABELED VARIABLE

NOTE: Variable available only for 2004.

MRK_RTE1      

MARKED ROUTE1

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

MRK_RTE2      

MARKED ROUTE1

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

MRK_RTE3      

MARKED ROUTE1

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

MRK_RTE4      

MARKED ROUTE1

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

MRK_RTNBR     

MARKED ROUTE NUMBER

NON-LABELED VARIABLE

NOTE: Variable available only for 2004.

MRKD_RTE_BEGMP

MARKED ROUTE BEGINNING MILEPOST

NON-LABELED VARIABLE

NOTE: Variable available only for 2004.

MULTICNT      

ANNUAL AVERAGE DAILY MULTIPLE UNIT VOLUME

• .             = 'NOT CODED'
• 00000 = 'NO ROW REPORTED'
• 00001 - 04000 = ' 1 - 4000'
• 04001 - 08000 = ' 4001 - 8000'
• 08001 - 12000 = ' 8001 - 12000'
• 12001 - 16000 = '12001 - 16000'
• 16001 - HIGH = 'MORE THAN 16000'

NOTE: Variable added in 1997.

MUNI_NAME     

MUNICIPAL NAME

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

MVMT          

MILLION VEHICLE MILES OF TRAVEL

NON-LABELLED VARIABLE

NOTE: Variable added in 1987.

NEW_ONEWAY    

NEW ONEWAY

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

NHS_CDE       

NATIONAL HIGHWAY SYSTEM

• ' ' = 'NOT CODED
• '0' = 'NOT NATIONAL HIGHWAY SYSTEM'
• '1' = 'NHS NOT AN NHS CONNECTOR'
• '3' = 'NHS C. MAJOR PORT FACILITY'
• '4' = 'NHS C. MAJOR AMTRAK STATION'
• '5' = 'NHS C. MAJOR RAIL/TRUCK TERMINAL'
• '6' = 'NHS C. MAJOR INTERCITY BUS TERMINAL'
• '7' = 'NHS C. MULTI-MODAL PASSENGER TERMINAL'
• '8' = 'NHS C. PIPELINE TERMINAL'
• '9' = 'NHS C. MAJOR FERRY TERMINAL'

NOTE: Variable added in 1997.

NO_LANES      

TOTAL NUMBER OF LANES

• . = 'NOT CODED'
• 1 = ' 1 LANE'
• 2 = ' 2 LANES'
• 3 = ' 3 LANES'
• 4 = ' 4 LANES'
• 5 = ' 5 LANES'
• 6 = ' 6 LANES'
• 7 = ' 7 LANES'
• 8 = ' 8 LANES'
• 9 = ' 9 LANES'
• 10 = '10 LANES'
• 11 = '11 LANES'
• 12 = '12 LANES'

NOTE: Variable added in 1987.

NO_SPLNS      

NUMBER OF SPECIAL LANES

• . = 'NOT CODED'
• 0 = '0 NO SPECIAL LANE'
• 1 = '1 SPECIAL LANE'
• 2 = '2 SPECIAL LANES'
• 3 = '3 SPECIAL LANES'
• 4 = '4 SPECIAL LANES'

NOTE: Variable added in 1997.

NON_ATTN      

NON-ATTAINMENT AREA

• 0000 = 'NOT AN OZONE NON-ATTAINMENT AREA'
• 1051 = 'CHICAGO OZONE NON-ATTAINMENT AREA'
• 1660 = 'ST. LOUIS OZONE NON-ATTAINMENT AREA'

NOTE: Variable added in 1997.

ODM_MILE      

ODOMETER MILE

NON-LABELED VARIABLE

NOTE: Variable added in 2002.

ODM_SIGN      

ODOMETER SIGN

NON-LABELED VARIABLE

NOTE: Variable added in 2002.

OLD_AADT      

OLD AADT

• '000001'-'000100' = '1-100'
• '000101'-'000500' = ' 101-500'
• '000501'-'001000' = ' 501-1,000'
• '001001'-'002000' = '1,001-2,000'
• '002001'-'005000' = '2,001-5,000'
• '005001'-'010000' = '5,001-10,000'
• '010001'-'015000' = '10,000-15,000'
• '015001'-'020000' = '15,001-20,000'
• '020001'-'040000' = '20,001-40,000'
• '040001' - HIGH = '40,000 +'

NOTE: Variable discontinued in 1995.

ONEWAY        

ONEWAY INDICATOR

• 1 = 'ONE-WAY'
• 2 = 'TWO-WAY'
• 3 = 'ONE-WAY REVERSIBLE'          
• 4 = 'TWO-WAY REVERSIBLE'          
• OTHER = 'NOT CODED'

NOTE: Variable discontinued in 1987.

OPCRSNBR      

OPPOSITE ROAD CRS NUMBER

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1997.

OPP_FAULT     

OPPOSITE ROAD FAULT

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

OPP_PAVDIS    

OPPOSITE ROAD PAVEMENT DISTRESS

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

OPP_RUTDEPT   

OPPOSITE ROAD RUT DEPTH

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

ORG_SECB      

ORIGINAL CONSTRUCTION SEC B

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1995.

ORG_SECC      

ORIGINAL CONSTRUCTION SEC C

NON-LABELED VARIABLE

NOTE: Variable discontinued in 1995.

OUTSHTP1      

OUTSIDE SHOULDER TYPE 1

• ' ' = 'NOT CODED'
• '0' = 'NO SHOULDER'               
• '1' = 'EARTH'                     
• '2' = 'SOD'                       
• '3' = 'AGGREGATE'                 
• '4' = 'SURFACE TREATED'           
• '5' = 'BITUMINOUS'                
• '6' = 'CONCRETE-UNTIED'           
• '7' = 'CONCRETE-TIED (ONLY FOR SHOULDER 1)'
• '8' = 'V GUTTER'                  
• '9' = 'CURB AND GUTTER'           

NOTE: (1) If a road section has different shoulder types on the two outside shoulder, then the shoulder type having the lower numbered coded is used. (2) For sections having composite shoulders (e.g., part paved, part sod), this is the type that is adjacent to the travel lane. See OUTSHTP2 for other (outer) shoulder type. (3) Variable added in 1987.

OUTSHTP2      

OUTSIDE SHOULDER TYPE 2

• ' ' = 'NOT CODED'
• '0' = 'NO SHOULDER'               
• '1' = 'EARTH'                     
• '2' = 'SOD'                       
• '3' = 'AGGREGATE'                 
• '4' = 'SURFACE TREATED'           
• '5' = 'BITUMINOUS'                
• '6' = 'CONCRETE-UNTIED'           
• '7' = 'CONCRETE-TIED (ONLY FOR SHOULDER 1)'
• '8' = 'V GUTTER'                  
• '9' = 'CURB AND GUTTER'           

NOTE: (1) This is coded for composite shoulders, and defines the shoulder type not adjacent to the travel lane – the outer shoulder type. See OUTSHTP1 for inner shoulder type. (2) Variable added in 1997.

OUTSHWD1      

OUTSIDE SHOULDER WIDTH 1

• .  = 'NOT CODED'
• 00 = ' 0 FT'
• 01 = ' 1 FT'
• 02 = ' 2 FT'
• 03 = ' 3 FT'
• 04 = ' 4 FT'
• 05 = ' 5 FT'
• 06 = ' 6 FT'
• 07 = ' 7 FT'
• 08 = ' 8 FT'
• 09 = ' 9 FT'
• 10 = '10 FT'
• 11 - HIGH = '>=11 FT'

NOTE: (1) This is the full width for shoulders of non-composite (single type) shoulders, and the width of the inner shoulder type – adjacent to the travel lane - for composite shoulders. See the note under OUTSHTP1 for more information. (2) Variable added in 1987.

OUTSHWD2      

OUTSIDE SHOULDER WIDTH 2

• .  = 'NOT CODED'
• 00 = ' 0 FT'
• 01 = ' 1 FT'
• 02 = ' 2 FT'
• 03 = ' 3 FT'
• 04 = ' 4 FT'
• 05 = ' 5 FT'
• 06 = ' 6 FT'
• 07 = ' 7 FT'
• 08 = ' 8 FT'
• 09 = ' 9 FT'
• 10 = '10 FT'
• 11 - HIGH = '>=11 FT'

NOTE: (1) Refer to the notes for OUTSHTP2 for more information. (2) Variable added in 1997.

OVHOBSNR      

OVERHEAD OBSTRUCTION NUMBER

NON-LABELLED VARIABLE

NOTE: Variable added in 1997.

PAV_DIST      

PAVEMENT DISTRESS

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

PAVECOND      

PRESENT SERVICE RATING

• 0 = 'UNKNOWN (UNKNOWN/NOT DETERMINED)'
• 1 = 'UNCOMF ROUGH (CAN EASILY KNOCK VEHICLE OUT OF ALIGNMENT)'
• 2 = 'UNCOMFORTABLE (NOT OVER ENTIRE SECTION)'
• 3 = 'ROUGH AREAS (NOT COMFORTABLE AT ALL TIMES)'
• 4 = 'AVERAGE (SOME VIBRATIONS, A FEW BUMPS)'
• 5 = 'ABOVE AVERAGE (COMFORTABLE - NO AREAS OF HARSH RIDE)'
• 6 = 'VERY SMOOTH (SUPER FINE RIDE)'

NOTE: (1) Only categories 0 and 1 are coded. Use this variable with caution. (2) Variable added in 1987 and discontinued in 1995.

PCNT_TRK      

PERCENTAGE TRUCKS

• '00'      = '0'
• '01'-'05' = '1 - 5'
• '06'-'10' = '6 - 10'
• '11'-'20' = '11 - 20'
• '21'-'40' = '21 - 40'
• '41'-'98' = '41 - 98'
• '99'      = '99'
• '  '      = 'NOT CODED'

NOTE: (1) Little useable data after 1990. See COMM_VOL.

(2) Variable added in 1987 and discontinued in 1995.

PLN_SEQ       

PLANNING SEQUENCE

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

POP_GRP       

MUNICIPALITY POPULATION GROUP

• ' ' = 'NOT CODED'
• '0' = '      0 -     999'
• '1' = '  1,000 -   2,499'
• '2' = '  2,500 -   4,999'
• '3' = '  5,000 -   9,999'
• '4' = ' 10,000 -  24,999'
• '5' = ' 25,000 -  49,999'
• '6' = ' 50,000 -  99,999'
• '7' = '100,000 - 249,999'
• '8' = '250,000 - 999,999'
• '9' = '1,000,000 & OVER'
• 'N' = 'NOT IN A MUNICIPALITY

NOTE: Variable added in 1997.

PRKLN_WD      

PARKING LANE WIDTH

• 00    = '00'
• 01-08 = '01 - 08'
• 09-10 = '09 - 10'
• 11-15 = '11 - 15'
• 16-20 = '16 - 20'
• 21-99 = '21 - 99'

NOTE: Variable added in 1987 and discontinued in 1995.

RATE_DTE      

MNTH-YR OF COND RATING

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

RD_DIST       

TOWNSHIP/ROAD DISTRICT

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

RD_STRUC      

STRUCTURE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

RD_YEAR       

YEAR ROAD CONSTRUCTED

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

REF_PNT       

REFERENCE POINT

NON-LABELLED VARIABLE

NOTE: (1) Variable added in 1987 and discontinued in 1995. (2) See discussion section for more details.

REF_PNT1      

REFERENCE POINT 1

REF_PNT2      

REFERENCE POINT 2

REF_PNT3      

REFERENCE POINT 3

NON-LABELLED VARIABLE

NOTE: Variables added in 1997.

REF_PNTA      

REFERENCE POINT A

NON-LABELLED VARIABLE

NOTE: (1) Variable added in 1987 and discontinued in 1995. (2) See discussion section for more details.

REFPNT1A      

REFERENCE POINT 1 TYPE

REFPNT2A      

REFERENCE POINT 2 TYPE

REFPNT3A      

REFERENCE POINT 3 TYPE

• ' ' = 'NOT CODED'
• '1' = 'AT-GRADE INTERSECTION'
• '2' = 'COMMERCIAL ENTRANCE'
• '3' = 'INTERCHANGE RAMP (MERGING)'
• '4' = 'REST AREA RAMP'
• '5' = 'HEAVY TRAFFIC GENERATOR'
• '6' = 'WEIGH STATION RAMP'
• '7' = 'MEDIAN CROSSING'
• '9' = 'OTHER'
• 'N' = 'NOT APPLICABLE'

NOTE: Variable added in 1997.

REFPT1IN      

REFERENCE POINT 1 INTERSECTION

REFPT2IN      

REFERENCE POINT 2 INTERSECTION

REFPT3IN      

REFERENCE POINT 3 INTERSECTION

• 'A' = 'ACROSS'
• 'B' = 'BEHIND'
• 'C' = 'CENTER'
• 'D' = 'CENTER FROM LEFT LANES (OPPOSING DOI)'
• 'E' = 'CENTER FROM RIGHT LANES (WITH DOI)'
• 'H' = 'AHEAD'
• 'L' = 'LEFT'
• 'R' = 'RIGHT'
• 'N' = 'NOT APPLICABLE'

NOTE: Variable added in 1997.

RESEV_RD      

RESERVATION ROAD

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

REV_CDE       

FORWARD/REVERSE CODE

NON-LABELED VARIABLE

NOTE: (1) Designates direction of original inventory. Accidents are located correctly to sections regardless of directions. However, for sections designated with an AR@, the point that normally designates the PC is the PT, and the point normally designating the beginning of a structure is the end. The ‘other end’ can be determined by subtracting the length. (2) Variable added in 1987 and discontinued in 1995.

RODWYCLS      

ROADWAY CLASSIFICATION

• ' '  = 'NOT CODED'
• '01' = 'URBAN FREEWAYS'
• '02' = 'URBAN FREEWAYS < 4 LANE'
• '03' = 'URBAN 2 LANE ROADS'
• '04' = 'URBAN MULTILANE DIVIDED NON FREEWAYS'
• '05' = 'URBAN MULTILANE UNDIVIDED NON FREEWAYS'
• '06' = 'RURAL FREEWAYS'
• '07' = 'RURAL FREEWAYS < 4 LANE'
• '08' = 'RURAL 2 LANE ROADS'
• '09' = 'RURAL MULTILANE DIVIDED NON FREEWAYS'
• '10' = 'RURAL MULTILANE UNDIVIDED NON FREEWAYS'
• '99' = 'OTHERS'

ROW           

RIGHT OF WAY

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

RPK_REST      

PARKING RESTRICTION

• ' ' = 'NOT CODED'
• '0' = 'UNDETERMINED'
• '1' = 'NO PARKING'
• '2' = 'PARALLEL PARKING'
• '3' = 'DIAGONAL PARKING'
• '4' = 'OTHER'

NOTE: Variable added in 1997.

RR_CRX        

RAILROAD CROSS RIDEABILITY

• 0 = 'UNKNOWN/NOT DETERMINED'
• 1 = 'SEVERELY JOLTED (RACKING EXPERIENCE)'
• 2 = 'VERY UNCOMFORT (NOTICEABLE JOLT - SLOWING REQUIRED)'
• 3 = 'NOTICEABLE JAR (UNCOMFORTABLE, BUT NOT SEVERE)'
• 4 = 'BUMP FELT (NOT ENOUGH TO SERIOUSLY AFFECT OCCUPANTS)'
• 5 = 'SLIGHT BUMP (HARDLY NOTICED BY OCCUPANTS)'
• 6 = 'SUPER SMOOTH (ALMOST UNNOTICEABLE AT HIGHWAY SPEEDS)'

NOTE: Variable added in 1987 and discontinued in 1995.

RRD_LNK       

RAILROAD LINK NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

RRX_DIRCD     

RAILROAD DIRECTION CODE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

RRX_RIDE      

RAILROAD CROSSING RIDEABILITY

• '0' = 'UNKNOWN/NOT DETERMINED/NOT APPLICABLE'
• '1' = 'CAR IS SEVERELY JOLTED - SHOULD BE TRAVERSED AT A SPEED LESS THAN 10 MPH'
• '2' = 'VERY UNCOMFORTABLE - CAR IS NOTICEABLY JOLTED OR SHAKEN - CAR DEFINITELY HAS TO BE SLOWED DOWN TO CROSS TRACKS'
• '3' = 'NOTICEABLE JAR - UNCOMFORTABLE BUT NOT SEVERE - CAR SHOULD BE SLOWED DOWN FOR SAFETY'
• '4' = 'A BUMP FELT, BUT NOT ENOUGH TO SERIOUSLY AFFECT THE CAR OCCUPANTS'
• '5' = 'A VERY SLIGHT BUMP - HARDLY NOTICED BY OCCUPANTS'
• '6' = 'SUPER SMOOTH CROSSING ALMOST UNNOTICEABLE AT HIGHWAY SPEEDS'

NOTE: Variable added in 2004.

RTE_APPURT    

ROUTE APPURTENANCE

NON-LABELED VARIABLE

NOTE: Variable available only for 2004.

RTE_NBR       

ROUTE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

RTE_SEGCD     

ROUTE SEQUENCE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

RTE_STAT      

ROUTE STATION

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 2005. Data is missing for the years 1993, and 1995 to 2003.

RTE_STAT_END  

ROUTE STATION END

NON-LABELED VARIABLE

NOTE: Variable available only for 2004.

RTE_SUFX      

ROUTE SUFFIX

• ' ','0'          = 'NO SUFFIX'
• 'A'-'P'          = 'MAINLINE '
• 'Q','R', 'S','T' = 'RAMPS OFF'
• 'W','Y', 'Z'     = 'WYES OFF'
• 'U'              = 'SPUR OFF'

NOTE: Data available for the years 1992 and 1995.

RTE_TYPE      

ROUTE TYPE

• 1 = 'FEDERAL-AID INTERSTATE'      
• 2 = 'FEDERAL-AID PRIMARY'         
• 3 = 'FEDERAL-AID SECONDARY'       
• 4 = 'STATE BOND ISSUE'            
• 5 = 'COUNTY HIGHWAY'              
• 6 = 'HOUSE OR SENATE BILL'        
• 7 = 'TOWNSHIP'                    
• 8 = 'OTHER ROAD'
• 9 = 'FEDERAL-AID URBAN'
• 0 = 'MUNICIPAL STREET'

NOTE: Variable discontinued in 1995.

RURURB        

RURAL/URBAN CODE

• 1 = 'RURAL'
• 2 = 'URBAN'
• 8 = 'RURAL UNKNOWN'
• 9 = 'URBAN UNKNOWN'

NOTE: (1) The RUR_URB variable was created to supplement the functional class and urban area' variables already on the file. By using a combination of these two variables, a Rural/Urban code was created. (2) Variable added in 1987.

RUT_DEPTIN    

RUT DEPTH INDICATOR

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

S_RTENBR      

SAF-MRK-ROUTE NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

S_RTETYP      

SAF-MRK-ROUTE TYPE

• 1 = 'U.S. ROUTE'
• 2 = 'INTERSTATE BUSINESS ROUTE'
• 3 = 'BUSINESS U.S. ROUTE'
• 4 = 'BYPASS U.S. ROUTE'
• 5 = 'ILLINOIS ROUTE'
• 6 = 'ALTERNATE ILLINOIS ROUTE'
• 7 = 'BUSINESS ILLINOIS ROUTE'
• 8 = 'STATE MAINTAINED ROUTE'
• 9 = 'INTERSTATE ROUTE'
• 0 = 'NOT MARKED'
• OTHER = 'ERROR CODES'

NOTE: Variable added in 1987.

SAF_CNTL      

SAF-ACCESS-CNTL

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

SAF_FASY      

SAF-FASYS

NON-LABELED VARIABLE

NOTE: Variable added in 1987 discontinued in 1995.

SAF_TWN       

SAF-TWNSHP

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

SEG_LNG       

CALCULATED SECTION LENGTH

NON-LABELED VARIABLE

NOTE: (1) This is a calculated variable based on BEGMP and ENDMP, which provides an accurate section length. (2) Variable added in 1987.

SHLD_CON      

SHOULDER CONDITION

• 0   = 'NOT REQUIRED/NO DATA
• 1-2 = 'NOT SAFE (SAFE USE PROHIBITED)'
• 3-4 = 'DISINTERGRATION (CONSIDERABLE FAILURES - BEYOND NORMAL MAINTENANCE)'
• 5-6 = 'BARELY ADEQUATE (LIMITED FAILURES - HIGH MAINTENANCE)'
• 7   = 'ADEQUATE (ADEQUATE WITH NORMAL MAINTENANCE)'
• 8-9 = 'NEW (NEW OR NEAR PERFECT CONDITION)'

NOTE: Variable added in 1987 and discontinued in 1995.

SPD_LIM2      

POSTED SPEED LIMIT (MINUS DIRECTION)

SPD_LIMT      

ROADWAY SPEED LIMIT

• 00 = 'SPEED LIMIT UNK'
• 01 - 05 = '01-05'
• 06 - 10 = '06-10'
• 11 - 15 = '11-15'
• 16 - 20 = '16-20'
• 21 - 25 = '21-25'
• 26 - 30 = '26-30'
• 31 - 35 = '31-35'
• 36 - 40 = '36-40'
• 41 - 45 = '41-45'
• 46 - 50 = '46-50'
• 51 - 55 = '51-55'
• 56 - 60 = '56-60'
• 61 - 65 = '61-65'
• 66 - 70 = '66-70'
• 71 - 75 = '71-75'
• 76 - 80 = '76-80'
• 81 - 85 = '81-85'
• 86 - 99 = 'OVER 85'

NOTE: (1) Variables added in 1987. (2) SPD_LIM2 was discontinued in 1995.

SPEC_SYSM     

SPECIAL SYSTEMS

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

SPLN_TYP      

LANES SPECIAL TYPE

• ' ' = 'NOT CODED'
• '0' = 'NO SPECIAL LANE'
• '1' = 'RIGHT AND LEFT TURN LANES'
• '2' = 'RIGHT TURN LANE'
• '3' = 'LEFT TURN LANE'
• '4' = 'BI-DIRECTIONAL TURN LANE'
• '5' = 'REVERSIBLE LANE'
• '6' = 'TRUCK CLIMBING LANE'
• '7' = 'RAMP TO RAMP CONNECTORS (AUXILIARY)'
• '8' = 'SCALE LANE/REST AREA LANE'
• '9' = 'TOLL BOOTH LANE'

NOTE: Variable added in 1997.

SPLN_WID      

SPECIAL LANE WIDTH

• .       = 'NOT CODED'
• 00      = '    0 FT'
• 01 - 05 = ' 1- 5 FT'
• 06 - 10 = ' 6-10 FT'
• 11 - 15 = '11-15 FT'
• 16 - 20 = '16-20 FT'
• 21 - 25 = '21-25 FT'
• 26 - 30 = '26-30 FT'
• 31 -HIGH= '  >30 FT'

NOTE: Variable added in 1997.

STAT_DIR      

PLAN STATION DIRECTION

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

STOU_IND      

STRUCTURE OVER/UNDER INDICATOR

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

STR_ENDM      

STRUCTURE END MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

STR_LNG       

STRUCTURE LENGTH

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

STRDIRCD      

STRUCTURE DIRECTION CODE

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

STRT_NAM      

STREET NAME

NON-LABELED VARIABLE

NOTE: Variable added in 1987.

STRU_FAC      

STRUCTURE FACILITY LOCATION

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

STRU_LNK      

STRUCTURE LINK NUMBER

NON-LABELED VARIABLE

NOTE: Variable added in 1997 and discontinued in 1995.

SUF_CDE       

SUFFIX CODE

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

SURF_RAT      

SURFACE CONDITION RATING

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

SURF_TYP      

SURFACE TYPE – ROAD 1

• 010 = 'NATURAL SURFACE, NOT CONFORMING TO GRADED AND DRAINED EARTH ROAD REQUIREMENTS'
• 020 = 'NATURAL EARTH, GRADED WITH DRAINAGE'
• 100 = 'WITHOUT DUST PALLIATIVE TREATMENT'
• 110 = 'WITH DUST PALLIATIVE'
• 200 = 'WITHOUT DUST PALLIATIVE TREATMENT'
• 210 = 'WITH DUST PALLIATIVE TREATMENT'
• 300 = 'BITUMINOUS SURFACE-TREATED'
• 400 = 'MIXED BITUMINOUS (LOW TYPE BITUMINOUS)'
• 410 = 'BITUMINOUS PENETRATION'
• 500 = 'HIGH TYPE BITUMINOUS (FLEXIBLE BASE)'
• 550 = 'BITUMINOUS CONCRETE, SHEET OR ROCK ASPHALT'
• 600 = 'PCC - REINFORCEMENT UNKNOWN'
• 610 = 'PCC - NO REINFORCEMENT'
• 620 = 'PCC - PARTIAL REINFORCEMENT'
• 630 = 'PCC - FULL REINFORCEMENT'
• 640 = 'PCC - CONTINUOUS REINFORCEMENT'
• 650 = 'BRICK, BLOCK, STEEL, OR LIKE MATERIAL'
• 700 = 'PCC - REINFORCEMENT UNKNOWN'
• 710 = 'PCC - NO REINFORCEMENT'
• 720 = 'PCC - PARTIAL REINFORCEMENT'
• 730 = 'PCC - FULL REINFORCEMENT'
• 740 = 'PCC - CONTINUOUS REINFORCEMENT'
• 800 = 'BRICK, BLOCK, OR OTHER'
• 900-999 = 'VARIOUS COMBINATION SURFACE TYPES'
• OTHER= 'ERROR CODES'

NOTE: Variable added in 1987.

SURF_WID      

TOTAL SURFACE WIDTH

• 00 = '00'
• 01-15 = '01 - 15'
• 16-18 = '16 - 18'
• 19-22 = '19 - 22'
• 23-25 = '23 - 25'
• 26-30 = '26 - 30'
• 31-40 = '31 - 40'
• 41-50 = '41 - 50'
• 51-60 = '51 - 60'
• 61-80 = '61 - 80'
• 81-999= '81 +'

NOTE: Variable added in 1987.

SURF_YR       

YEAR PRESENT SUF CONST

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

SURFDATE      

YEAR OF SURFACE CONSTRUCTION

NON-LABELED VARIABLE

NOTE: (1) This variable provides information similar to that provided by SURF_YR in the earlier years. (2) Variable added in 1997.

TOTINSHL      

TOTAL INSIDE SHOULDER WIDTH (1 + 2)

NON-LABELED VARIABLE

NOTE: (1) '0' = NO WIDTH, '1 - 19' = WIDTH TO NEAREST FOOT   (2) Variable coded only for divided highways. (3) Variable added in 1997.

TOTOTSHL      

TOTAL OUTSIDE SHOULDER WIDTH (1 + 2)

NON-LABELED VARIABLE

NOTE: (1) Refer to notes for outside shoulder type/width 1 and 2. (2) Variable added in 1997.

TRF_CNTL      

TRAFFIC CONTROL

• ' '  = 'NOT CODED'
• 'N' = 'NOT AN INTERSECTION'       
• '0' = 'NO TRAFFIC CONTROL DEVICES'
• '1' = '1-2 WAY STOP/NO RED FLASHING LIGHTS'
• '2' = 'ALL WAY STOP/NO RED FLASHING LIGHTS'
• '3' = '1-2 WAY STOP/WITH RED FLASHING LIGHTS'
• '4' = 'ALL WAY STOP/WITH RED FLASHING LIGHTS'
• '5' = 'TRF SIGNALS/2 PHASE(FIXED TIME)'
• '6' = 'TRF SIGNALS/2 PHASE(TRAFFIC ACTUATED)'
• '7' = 'TRF SIGNALS/MULTI-PHASE(FIXED TIME)'
• '8' = 'TRF SIGNALS/MULTI-PHASE(TRF ACTUATED)'
• '9' = 'NOT DETERMINED'            

NOTE: (1) TRF_CNTL describes the type of traffic control device operating at the intersection. In the description of the codes for this variable, 'PHASE' is the part of the cycle for any combination(s) of traffic movements receiving the right-of-way simultaneously. (2) Variable added in 1989.

TRK_RTE       

DESIGNATED TRUCK ROUTE

• '1' = 'CLASS I DESIGNATED TRUCK ROUTE'
• '2' = 'CLASS II DESIGNATED TRUCK ROUTE'
• '3' = 'CLASS III DESIGNATED TRUCK ROUTE'
• '4' = 'NOT A DESIGNATED TRUCK ROUTE'

NOTE: Variable added in 1987.

URB_AREA      

URBAN AREA

• .           = 'NOT CODED'
• 0000        = 'ROAD SECTION NOT WITHIN AN URBAN AREA'
• 0001 - 2000 = 'AREA CODE IS BETWEEN 1 AND 2000'
• 2001 - 4000 = 'AREA CODE IS BETWEEN 2001 AND 4000'
• 4001 - HIGH = 'AREA CODE IS GREATER THAN 4001'

NOTE: Variable added in 1987.

VER_BEGMP     

VERTICAL GRADE BEGINNING MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

VER_ENDMP     

VERTICAL END MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 2004.

VERT_APP      

VERTICAL CURVE APPROACH GRAD

• -0801 -  -0500 =  '-0801 - -0500'
• -0499 -  -0300 =  '-0499 - -0300'
• -0299 -  -0200 =  '-0299 - -0200'
• -0199 -  -0100 =  '-0199 - -0100'
• -0099 -  -0001 =  '-0099 - -0001'
• +0001 -  +0099 =  '+0001 - +0099'
• +0100 -  +0199 =  '+0100 - +0199'
• +0200 -  +0299 =  '+0200 - +0299'
• +0300 -  +0499 =  '+0300 - +0499'
• +0500 -  +0800 =  '+0500 - +0800'

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. Refer to roadlog file discussion section. Use all vertical curve variables with caution, as information on vertical curves is neither a full census nor a random sample. (2) Variable added in 1987.

VERT_BEG      

VERTICAL CURVE BEGINNING MILEPOST

NON-LABELED VARIABLE

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. Refer to roadlog file discussion section. Use all vertical curve variables with caution, as information on vertical curves is neither a full census nor a random sample. (2) Variable added in 1997.

VERT_END      

VERTICAL CURVE END MILEPOST

NON-LABELED VARIABLE

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. Refer to roadlog file discussion section. Use all vertical curve variables with caution, as information on vertical curves is neither a full census nor a random sample. (2) Variable added in 1997.

VERT_LEV      

VERTICAL CURVE LEAVE GRADE

• -1200 - -0800 = '-1200 - -0800'
• -0799 - -0500 = '-0799 - -0500'
• -0499 - -0300 = '-0499 - -0300'
• -0299 - -0200 = '-0299 - -0200'
• -0199 - -0100 = '-0199 - -0100'
• -0099 - -0001 = '-0099 - -0001'
• +0001 - +0099 = '+0001 - +0099'
• +0100 - +0199 = '+0100 - +0199'
• +0200 - +0299 = '+0200 - +0299'
• +0300 - +0499 = '+0300 - +0499'
• +0500 - +0799 = '+0500 - +0799'
• +0800 - +1199 = '+0800 - +1199'
• +1200 - +9999 = '+1200 '

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. Refer to roadlog file discussion section. Use all vertical curve variables with caution, as information on vertical curves is neither a full census nor a random sample. (2) Variable added in 1987.

VERT_LGN      

VERTICAL CURVE LENGTH

• 0000        = 'NONE'
• 0001 - 0100 = '    1 -   100'
• 0101 - 0500 = '  101 -   500'
• 0501 - 1000 = '  501 - 1,000'
• 1001 - 2000 = '1,000 - 2,000'
• 2001 - 5000 = '2,000 - 5,000'

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. (2) Variable added in 1987 and discontinued in 1995.

VERTAPPS      

VERTICAL APPROACH SIGN

• '+' = 'UPHILL'
• '-' = 'DOWNHILL'

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. Refer to roadlog file discussion section. Use all vertical curve variables with caution, as information on vertical curves is neither a full census nor a random sample. (2) Variable added in 1997.

VERTLEVS      

VERTICAL LEAVE SIGN

• '+' = 'UPHILL'
• '-' = 'DOWNHILL'

NOTE: (1) Vertical grade data is only collected for "substandard" vertical curves. Refer to roadlog file discussion section. Use all vertical curve variables with caution, as information on vertical curves is neither a full census nor a random sample. (2) Variable added in 1997.

VOL_YR        

YEAR OF HEAVY COMER VOL

NON-LABELED VARIABLE

NOTE: Variable added in 1987 and discontinued in 1995.

XAADT         

CROSSROAD AADT

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

XCOMADT       

CROSSROAD COMMERCIAL ADT

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

XFUNC_CL      

CROSS FUNCTIONAL CLASS

• .  = 'NOT CODED'
• 10 = 'INTERSTATE'
• 20 = 'FREEWAY AND EXPRESSWAY (URBAN ONLY)'
• 30 = 'OTHER PRINCIPAL ARTERIAL'
• 40 = 'MINOR ARTERIAL (NON-URBAN)' 
• 50 = 'MAJOR COLLECTOR (NON-URBAN)'
• 55 = 'MINOR COLLECTOR (NON-URBAN)'
• 60 = 'LOCAL ROAD OR STREET (NON-URBAN)'
• 70 = 'MINOR ARTERIAL (URBAN)'
• 80 = 'COLLECTOR (URBAN)'
• 90 = 'LOCAL ROAD OR STREET (URBAN)'

NOTE: Variable added in 1997.

Deficient Curve File

NOTE: (1) This file only contains data on deficient curves from 1997 onwards.

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

SAS FORMAT DEFINITIONS FOR VARIABLES FROM THE ILLINOIS DEFICIENT CURVE FILE

BEGMP         

BEGIN MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

CNTY_RTE      

CNTY RTETYP RTENBR

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

CURV_LGT      

CURVE LENGTH

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

CURV_RAD      

CURVE RADIUS

• 00000 - 02000 = ' 0 - 2000 FT'
• 02001 - 04000 = '2000 - 4000 FT'
• 04001 - 06000 = '4000 - 6000 FT'
• 06001 - 08000 = '6000 - 8000 FT'
• 08001 - 10000 = '8000 -10000 FT'
• 10001 - HIGH = 'MORE THAN 10000 FT'

NOTE: Variable added in 1997.

DEG_CURV      

DEGREE OF CURVE

• 00.01 - 01.00 = '0.01 - 1.0'
• 01.01 - 02.59 = '1.01 - 2.59'
• 02.60 - 05.00 = '2.6 - 5.0'
• 05.01 - 10.00 = '5.01 - 10.0'
• 10.01 - 20.00 = '10.01 - 20.0'
• 20.01 - 30.00 = '20.01 - 30.0'
• 30.01 - 999.0 = 'OVER 30.0'

NOTE: Variable added in 1997.

DIR_CURV      

HORIZONTAL CURVE DIRECTION

• ' ' = 'NOT CODED'
• 'L' = 'LEFT'
• 'R' = 'RIGHT'

NOTE: Variable added in 1997.

ENDMP         

END MILEPOST

NON-LABELED VARIABLE

NOTE: Variable added in 1997.

SEG_LNG       

SEGMENT LENGTH

NON-LABELED VARIABLE

NOTE: Variable added in 1997.