Evaluation of Highway traffic safety based on velocity dispersion

Road traffic accidents easily happen in Highway. By establishing a evaluation model, traffic alert can be more effectivly implemented, improving the quality of highway traffic safety. The impact of velocity dispersion to Highway traffic safety is researched, and a new definition of velocity dispersion is introduced, analyzing the relationship between the new definition of velocity dispersion and conventional velocity dispersion - standard deviation of speed, which indicates there is direct linear relationship between the two. On the basis of the new definition of velocity dispersion, driver, road, vehicle and the climatic factor are joined, constituting six major indicators of the driver - vehicle - road - the road alignment - climate - vehicle status, and in the context of six major indicators, the sub-indicators of the major indicators are selected, establishing a corresponding evaluation indicator system. The weight of each parameter is calculating to build the model by the use of AHP. At last a total evaluation model of Highway traffic safety is established.