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    Development of a Wet Weather Safety Index

    Development of a Wet Weather Safety Index


    This report documents the development of two wet weather safety indices. The first, WWSIa, is an analytical index developed from a number of preceding analytical and empirical studies of tire-pavement friction, vehicle handling and stability, potential for hydroplaning and visibility during periods of rainfall. This index is a site-specific formulation which will provide highway engineers with a capability of selecting appropriate combinations of road surface geometrics, surface textures and skid numbers for the design of road elements as well as a way to analyze existing sites. The second, WWSIe, is an empirical formulation based on prediction equations for wet accident rates. These equations were derived by multiple regression techniques from a survey of sixty highway segments in Texas. These segments covered a range of wet accident rates from zero to 40 accidents per year per mile. In general, much higher values of wet accident rates are observed in urban areas than in rural areas. Also, the sensitivity to pavement skid resistance is much higher in urban than in rural areas.

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    Titel :

    Development of a Wet Weather Safety Index

    Beteiligte:
    D. L. Ivey (Autor:in) / L. I. Griffin (Autor:in) / T. M. Newton (Autor:in) / K. C. Hankins (Autor:in) / C. W. Blumentritt (Autor:in)
    Erscheinungsdatum :

    1977

    Format / Umfang :

    139 pages

    Medientyp :

    Report

    Format :

    Keine Angabe

    Sprache :

    Englisch

    Schlagwörter :

    Highway Engineering , Highways , Pavements , Safety , Indexes(Ratios) , Rain , Skid resistance , Surface roughness , Friction , Texture , Predictions , Motor vehicle accidents , Visibility , Wet road conditions , Wet pavements , Accident rates , Hydroplaning , Vehicle handling

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