面向安全的高速公路分岔口限速标志设置研究

Study of Traffic Safety for Highway Diverging Areas Based on the Cellular Automata Model

针对高速公路分岔口相关区域交通安全问题,从分岔口相关路段车辆标准速度差入手,首先对应高速公路分岔口关联区域车辆跟车、换道行为建立相应的元胞自动机模型,进而对不同参数设置下交通流演化过程进行数值分析.结果表明,路段车流密度及驶出分岔口车辆的比例的变化会对该路段车辆标准速度差产生重要影响;根据交通流情况,在高速公路分岔口上游设置限速标志并确定合理的限速值,有利于提高高速公路分岔口处交通安全.

Considering the traffic safety for highway diverging areas, this paper proposed the cellular automata model to analyze the vehicle behaviors at highway diverging. It then analyzed the traffic flow evolution process based on the cellular automata behavior rules. The simulation results showed that the change of traffic flow density and proportion of exiting vehicles can bring a great effect on the vehicles speed standard deviations. Installing speed limit signs and setting up reasonable speed limits can help to improve the traffic safety of highway diverging areas.