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Rainfall caused by road safety problem has attracted world attention. Rainy road traffic accidents is often a series of chains , such as rear-end , etc., it is different from ordinary bicycle accidents, incidents more hazardous rain , causing casualties and economic losses is greater. In this paper, road works , traffic engineering , driving theory, such as meteorology and statistical knowledge to Chongqing Ring Expressway as the basis, to carry out targeted rainy road safety accident cause analysis and security technology . First, through the collection of data in Chongqing expressway roads , traffic information and traffic data, using statistical analysis, come rain accident characteristics: accident cars to small cars based, bicycle accident-prone , accident forms mainly hit fixtures and trailing collision , accident risk curve segment than line segments. Distributed along rainy accident statistics , analyzes the characteristics of distributed along rainy accident . Statistics show that accidents in the corners on rainy ratio greater than the proportion of straight line segments , in which the corners of the rainy accident occurred in approximately 70% of circular curve segment , and 30% occurred in the transition curve , and analyze its causes. Secondly, through field research and experimentation, from the wet pavement and road surface drainage performance analysis of two aspects of rain causes of the accident . Pavement wet, rainy analyzed lateral acceleration and the relationship between accident rates rainy proposed based on the lateral acceleration adaptive rain rainy road safety evaluation method . In the road surface drainage performance analysis, caused by surface water skiing vehicle safety as the goal, focusing on high transition section geometry , flow movement paths and water film thickness variation characteristics were analyzed , combined with surface runoff mechanical model ultra-high transition section of drainage characteristics , and further raised its drainage improvement program , and the program was evaluated. Finally , the use of the Java programming language of rain water film thickness and water skiing velocity analysis software and the actual calculation under different rainfall conditions beltway highway speed limits and general skiing values.
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