This report documents the results of a study of the safety effectiveness of clear recovery zones. Accident data were analyzed for highways constructed under each of three roadside design policies in the States of Illinois, Minnesota, and Missouri. Two-lane highways, four-lane freeways, and four-lane divided nonfreeways were considered. A statistically significant difference in single-vehicle run-off-road accident rates was found between each roadside design policy for each highway type. There was no statistically significant difference in the distribution of accident severities for the various roadside design policies. It was found that the cost-effectiveness of roadside design improvements can vary widely between highway sections due to differences in accident rates, traffic volumes, terrain, required construction quantities, unit construction costs, and right-of-way requirements. Four design examples were presented illustrating application of a cost-effective procedure for choosing a roadside design policy.


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    Title :

    Effectiveness of Clear Recovery Zones


    Contributors:

    Publication date :

    1982


    Size :

    78 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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