Research on Method of Post-Speed Limit Value Determining of Freeway

To reduce the probability and severity of accidents, improve traffic capacity, and ensure efficient operation of traffic flow, the speed limit has become an important means of highway traffic management. Based on the systematic analysis of the existing methods to determine the speed limit value, a posted speed limit value determining model has been proposed in the paper. First, the flat curve, the vertical curve, and the free flow of traffic are taken as reference values for limiting vehicle speed. Second, after comprehensively considering the influence of roadbed cross-section, traffic composition, pavement conditions, large structures, traffic accidents, and operating speed coordination as a correction factor, a multi-factor speed limit value determination model is constructed and verified by engineering examples.