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Estimating Wet-Pavement Exposure with Precipitation Data: Final Report.
| 题名： | Estimating Wet-Pavement Exposure with Precipitation Data: Final Report. |
| 作者： | Wang-S.; Veneziano-D.; Huang-J.; Shi-X. |
| 关键词： | *Wet-road-conditions.;Road-conditions; Highway-safety; Pavement-markings; Driver-performance; Environmental-factors; Highways-; Visibility-. |
| 摘要： | Achieving the best safety record in the nation is a primary goal for Caltrans. To this end, Caltrans develops a list of high collision concentration locations (Table C) every quarter using the Traffic Accident Surveillance and Analysis System (TASAS) database. Table C identifies the ramps, intersections and highway segments with accident rates that are significantly higher than the statewide average in 36-, 24-, 12-, 6-, and 3-month periods. The identified locations in Table C are then investigated individually to evaluate collision risk based on observed frequency. Caltrans also develops a Wet Table C annually that analyzes updated lists of wet accidents alone using a similar methodology as Table C. The existing table of percent wet time (i.e., wet pavement factors) was developed in 1972 using eleven years of data from 1957 to 1967. A Caltrans task force that investigated the methodology used to develop the Table C and Wet Table C recommended that the table of percentage wet time be updated. This research is the update of that table. The use of more recent data is expected to better reflect current climatic trends being taken into account in identifying significant wet-pavement crash locations in Wet Table C. In addition to updating wet-percent factors, this research examined current views toward Wet Table C within 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. |
| 报告类型： | 科技报告 |
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