关键词: 数值模拟, 人行横道, 行人心理, 元胞自动机, 临界安全间隙, 临界跟随间隙

Abstract: Considering the psychological factors of pedestrian crossing, a mixed traffic flow model is built based on Cellular Automata（CA）. In this model，the rules of interference between pedestrians and vehicles at crosswalk are revised, the probabilities of pedestrians crossing are achieved on the basis of the two introducing concepts of critical safety gap and critical decision gap, and the risk probabilities of pedestrians are redefined according to the threshold of pedestrian waiting time. Simulation results show that the critical decision gap, the threshold of pedestrian waiting time and the critical following gap have different effects on vehicle and pedestrian traffic flows,in which the effects of the critical following gap are strongest.

Key words: numerical simulation, pedestrian crossing, pedestrian psychology, Cellular Automation（CA）, critical safety gap；critical following gap