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Update and enhancement of ODOT's crash reduction factors.
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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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