Estimating Wet-Pavement Exposure with Precipitation Data: Final Report

In addition to updating wet-percent factors, this research examined current views toward Wet Table C within the California Department of Transportation (Caltrans), as well as the practices of other states in identifying wet pavement crash locations. It also examined the preparation and use of precipitation data in generating wet percent factors. Finally, the research examined what, if any, differences arose when using wet percent factors of a finer resolution than the countywide scale employed in the current Wet Table C. A singular value for an entire county may not reflect the climatic variation that occurs along the length of a particular roadway.