信号交叉口左转车道外置的影响因素仿真研究

Simulation of Influence Factors of Unconventional Outside Left-Turn Lane at Signalized Intersection

为了探究信号交叉口左转车道外置的适用条件,开展影响因素仿真研究.借助Vissim软件,构建了不同几何条件的交叉口仿真模型.通过输入不同的交通量与交通组成参数并进行仿真实验,对比分析了左转车道内置与外置的延误指标.得到了不同的进口道车道数、交织段长度、直行车辆数、外侧车道左转车辆数与左转大车率等因素对左转车道内外置延误的定量影响关系.针对两个城市的四个交叉口开展了道路交通调查与仿真实验,定量分析了在这些交叉口左转车道外置的延误降低效果.研究表明,在其他条件相同的情况下,外侧车道左转车辆数或左转大车率越大、直行车辆数越多、交织段长度越短,左转车道外置的延误降低效果越明显.

To explore the applicable conditions of unconventional outside left-turn lane at signalized intersection,the influence factors are simulated and studied.Using VISSIM,the simulation models of intersections with different geometric conditions are constructed.By inputting different traffic parameters of volume and composition and simulating,the delay indicators of traditional inside and unconventional outside left-turn lane are compared and analyzed.The quantitative influences of the number of lanes at entrance,the length of weaving section,the number of going straight vehicles,the number of left-turn vehicles and the percentage of left-turn buses in outside lane on delay of inside or outside left-turn lane are obtained.The road traffic investigation was carried out at four intersections in two cities.According to traffic simulation experiments,the delay reduction effect of unconventional outside left-turn lane at these intersections is analyzed quantitatively.The results show that when the number of left-turn vehicles or the percentage of left-turn buses in outside lane is larger,the number of going straight vehicles is larger,the length of weaving section is shorter,and the reduction effect of delays by unconventional outside left-turn will be more obvious.