Update and Enhancement of ODOT’s Crash Reduction Factors
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2006-06-01
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Abstract:Appropriate selection of cost-effective countermeasures for highway safety improvement projects requires an estimate of the safety effects of alternative designs. The Oregon Department of Transportation (ODOT), like many agencies, makes these estimates using crash reduction factors (CRFs). Since the development of ODOT’s original database in the early 1990s, there have been substantial methodological improvements in the evaluation of engineering countermeasures that have resulted in a wealth of new published research. This study provided a comprehensive update to ODOT’s CRFs database. The CRFs were updated via a thorough review and quality assessment of recent literature and input from an expert advisory group. Results will be incorporated into ODOT’s safety project analysis tools and will be processed and disseminated through ODOT’s regional offices and other local agencies using an interactive web page. The CRF website will allow users to search interactively for effective countermeasures for a particular highway safety improvement project based on key parameters and directly accessing the literature review database. This report provides a summary of national and international concurrent and complementary research, discusses the methodology used to review CRFs, and outlines development of an interactive web page.
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