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Validation and application of Highway Safety Manual (Part D) and developing Florida CMF Manual, phase 2.
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  • Abstract:
    The Highway Safety Manual (HSM) Part D provides a comprehensive list of the effects of safety treatments

    (countermeasures). These effects are quantified by crash modification factors (CMF) which are based on compilation

    from past studies of the effects of various safety treatments. The HSM Part D provides CMFs for treatments applied to

    roadway segments, intersections, interchanges, freeways, and special facilities. Nevertheless, it is essential to verify

    the applicability of the HSM CMFs in specific locales.

    The objectives of this study are (1) to develop CMFs for various treatments in Florida for the same setting

    (rural/urban), road types, crash types, and severity levels, (2) to evaluate the difference between these Florida-specific

    CMFs and the CMFs in the HSM, and (3) to recommend whether the CMFs in the HSM can be applied to Florida or

    new Florida-specific CMFs are needed. Moreover, in phase II, various Florida-specific CMFs and crash modification

    functions (CMFunctions) were estimated for the most common treatments in Florida. As with phase I of the project,

    there is a need to improve some CMFs that had insufficient data. An alternative way to combine multiple CMFs to

    identify the effectiveness of multiple treatments was suggested in this study.

    Different methods of observational studies were used to calculate CMFs and to develop CMF functions for a

    total of 37 additional treatments applied to roadway segments, intersections and special facilities. It was found that

    Florida-specific CMFs were generally statistically significant, and the safety effects represented by the CMFs were

    intuitive, similar to the CMFs in the HSM. It was also found that Florida-specific CMFs for the treatments not included

    in the HSM showed significant positive effects in reducing crash frequencies. We also present a Florida-specific

    manual of CMFs.

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