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                Media ContactsMenu OFFICE OF RESEARCH, DEVELOPMENT, AND TECHNOLOGY AT THE TURNER-FAIRBANK HIGHWAY RESEARCH CENTER Home
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   Ana Maria Eigen
      Ana Maria Eigen
      
                    
            Research Highway Safety Specialist
      
                    
            Office of Safety and Operations Research and Development
      
                    
            Turner-Fairbank Highway Research Center6300 Georgetown PikeMcLean, VA 22101United States
      
          
    **Email:**ana.eigen@dot.gov**Phone:** (202) 493-3168
    If you are deaf, hard of hearing, or have a speech disability, please dial 7-1-1 to access telecommunications relay services.
                
                State Statistics
    

    
    
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File Types

All of the selected States maintain basic crash files, roadway inventory files, and traffic files. In addition, individual States also collect other types of data. Depending on the particular problem being studied, files from one or more States may be used by the analyst. The following table indicates the files that are available.

CA
			Charlotte, NC
			IL
			ME
			MI
			MN
			NC
			OH
			UT
			WA**Crash**
			x
			x
			x
			x
			x
			x
			x
			x
			x
			x**Roadway**
			x
			x
			x
			x
			x
			x
			x
			x
			x
			x**Traffic Volume**
			x
			x
			x
			x
			x
			x
			x
			x
			x
			x**Curve/Grade**
			
			
			x
			
			
			
			x
			x
			x
			x**Intersection**
			x
			x
			
			x
			
			x**Interchange**
			x
			
			x
			x
			x
			x
			x
			
			
			x***Crash*** — Contains basic crash, unit, and person information on a case-by-case basis. Typical data include crash type, type of vehicle, sex and age of occupants, fixed-object struck, crash severity, and weather conditions.

***Roadway*** — Contains information on roadway cross-section and the type of roadway. Data include the number of lanes, lane width, shoulder width and type, median width, rural/urban designation, and functional classification.

***Traffic Volume***— Contains annual average daily traffic (AADT) data. Additional data on hourly volumes and percentage of trucks is also available in selected States and/or locations.

***Curve/Grade*** — Contains horizontal curve and vertical grade information. Data include degree of curve, length of curve, percent grade.

***Intersection***— Contains information on highway intersections. Data include traffic control type, intersection type, signal phasing, and turn lanes.

***Interchange***— Contains information on highway interchanges. Data include interchange type and ramp characteristics.

hr

**Data Quantity**

HSIS contains only police-reported crash data on the State-maintained highway system. The size of the State-maintained system depends on the policies of the State and is not necessarily proportional to the size of the State. Data for the original five HSIS States are available from 1985, while data for the three new HSIS States are available from 1991, and data for Ohio is available from 1997. The following table provides an indication of the quantity of data available.

Years of Available Data**California**
			1991-2021**Charlotte, NC**
			2004-2020**Illinois**
			1985-2021**Maine**
			1985-2021**Michigan**
			1985-1997**Minnesota**
			1985-2021**North Carolina**
			1990-2020**Washington**
			1993-1996, 1999-2020**Ohio**
			1997-2021**Utah**
			1985-2000
              
      
    
          Last updated: Tuesday, July 18, 2023 U.S. DEPARTMENT OF TRANSPORTATION

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