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                HSIS Guidebook - Illinois
IL HSIS Guidebook.pdf (997.91 KB)
      
  Publication Information
                  Publication Type:Handbook
                      Abstract:The Highway Safety Information System (HSIS), established in 1987, is a foundational highway research data system. The State of Illinois has participated in the HSIS program since 1987, providing quality data to HSIS for use by researchers through a request system. In 2021, HSIS began a modernization effort with the goal of expanding the technological and analytic capabilities of the data system. This modernization provides an increased emphasis on spatial analysis and cloud-based data management.

**What Has Changed**

This guidebook is intended to support the use of Illinois HSIS data for the years 2018 and beyond. Data and documentation prior to 2011 (1985-2010) are available upon request to the HSIS Virtual Laboratory. Prior to 2011, the Illinois datasets included variables for the following files:

Roadway inventory.
	Intersection inventory (1989-1994).
	Horizontal curve inventory (1997-2010).
	Accident characteristics.
	Vehicles involved in crashes.
	Vehicle occupants involved in crashes.The revised Illinois database incorporated into HSIS contains 4 different files:

Roadway inventory (including traffic information).
	Crash characteristics.
	Units involved in crashes.
	Persons involved in the crash.
              Publishing Date:September 2022
                                                  FHWA Program(s):Research
              Safety
              AMRP Program(s):Safety Data and Analysis
              FHWA Activities:Highway Safety Information System
              Subject Area:Safety and Human Factors U.S. DEPARTMENT OF TRANSPORTATION

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