Analysis of Highway Speed Limit Adjustment Based on Risk Assessment Technology

Reasonable standard of highway speed limit directly affects both on safety and efficiency. In order to improve traffic efficiency on the premise of ensuring safety, a method proposed for adjusting highway speed limit based on operating characteristics, traffic safety and traffic efficiency. A national highway is taken as an example to demonstrate the feasibility of the speed limit adjustment method. The results show that the proportion of high-risk road sections is reduced from 21.88% to 11.70% after adjusting the speed limit scheme, and the acceptable risk exceeds 85%. This method can provide reference for the decision-making of speed limit adjustment of key road sections in highway operation stage.