United States Department of Transportation
i
Wet weather exposure measures
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1988-02-01
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[PDF-3.61 MB]
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Edition:Final report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:Accident surveillance programs require a measure of wet-pavement exposure to determine whether the wet-pavement accident rates of particular highway sections are higher or lower than expected. This research program used the results of laboratory and field tests, together with available weather data to construct a model for estimating the percentage of time a pavement would be wet. The laboratory and field testing program addressed (1) the minimum level of pavement surface wetness that substantially reduces tire~pavement friction and (2) the time required for a pavement to dry following rainfall. A computer model, known as the WETTIME model, was developed in the research to estimate the monthly and annual hours of wet-pavement exposure. The model can be used to estimate wet-pavement exposure in the vicinity of any first-order weather station from data that can be obtained from the National Climatic Data Center in Asheville, North Carolina. Procedures were also developed to use the output of the WETTIME model to prepare isoexposure contour maps for enttire States or regions.
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