Ninety-four traffic safety projects were analyzed to determine crash reduction factors and benefit/cost (B/C) ratios for seven different improvement categories. Confidence intervals for the various crash categories were also determined. New crash reduction factors and B/C ratios are recommended for five of the seven categories analyzed. Overall analysis showed that the projects had a mean crash reduction rate of 23 percent. Hazard Elimination Safety (HES) projects accounted for a 40 percent decrease in crashes. Transportation Safety Funds (TSF) projects showed a 21 percent decrease in crashes. In all cases, the 90 percent confidence interval (the interval at which we can be 90 percent confident that the true mean lies within) is positive.


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    Title :

    Effectiveness of Roadway Safety Improvements


    Contributors:
    G. B. Thomas (author) / D. J. Smith (author)

    Publication date :

    2001


    Size :

    54 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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