城市道路两相位交叉口左转车道通行能力研究

Capacity Analysis on Left-Turn Lane at Two-Phase Intersection of Urban Road

以无信号控制交叉口可插车间隙理论为基础,分析了常见城市道路两相位信号控制交叉口左转车的交通流特性,建立了左转车道通行能力计算模型,通过实例对模型中的参数进行了标定。运用Vissim 3.6仿真软件对实际交叉口交通环境进行模拟,得到单位时间允许左转车通过交叉口进口道的最大车辆数,与模型计算所得通行能力值相比较,两者相对误差小于10%,从而证明所建立模型具有较强的适用性。

No signal control intersection theory is the basis for signalized intersections.Based on the theory of the gap acceptance at the intersection without traffic signal,the traffic flow characteristics about the left-turn lane at two-phase signal control intersection of urban road are analyzed and a left-turning crossing capacity model is established.Parameters of the proposed model is calibrated by the field data.Using the simulation software Vissim 3.6 to simulate the transportation environment of the actual intersection,the maxium number of vehicles on the left-turn lane which pass through the road intersection per hour is obtained.The relative error between the capacity obtained through the calculation model and the result got by Vissim 3.6 is less than 10%,which proves that the proposed computation model has good applicability.