基于仿真的城市道路交叉口最小安全间距研究

采用仿真的方法,研究了不同环境和交通流状态下,车辆驶出交叉口后在路段上的速度和车辆之间交互状态的变化规律.根据车队离散理论和交通冲突理论,以断面车辆速度标准差SD和交通冲突数量作为判断交通安全性的指标,通过判断车辆驶出交叉口后的运行状态,寻求车辆达到稳定状态时所需的距离,并以此距离作为道路交叉口之间的最小安全间距;最后建立了交叉口最小安全间距与各影响因素之间的函数关系.

Study on the Minimal Safety Intersection Spacing of City Road Based on Simulation

Using simulation method,the changing rules of vehicles speed and interaction states on links after leaving the intersection under various environments and traffic flow states were studied.According to vehicle platoon dispersion theory and traffic conflict theory,the speed variance(SD) and number of traffic collisions on road section were used as indexes of estimating the road safety.Through judging the vehicles moving state,the distance needed when vehicles achieve steady was used as the minimal safety intersection spacing.Then,the relationship functions between minimal safety intersection spacing and all influence factors were established,which provided basis for road network planning and speed limit.