基于VISSIM仿真的交叉口左转车流交通组织

为减少左转车流对交叉口运行效率的影响，结合实例对交叉口左转车流组织进行了研究。以威海市南大桥交叉口为例，分别以左转保护相位和禁左远引调头设计改造方案，利用VISSIM仿真软件对方案进行评价。仿真结果表明：相对左转保护相位车辆平均延误减少33.2％，相对改造前车辆平均延误减少52.1％。禁左远引调头在交叉口左转交通组织中效果明显，可有效减少延误，提高运行效率。

Left-turning traffic organization at intersection based on vissim simulation

To reduce the left-turning vehicles impact on the efficiency of the intersection operation, left-turning traffic organization at intersection was studied based on case. The South Bridge intersection is taken as an example at Weihai. Different traffic organization schemes based on the ideas of the phase of left-turn protection and left-turn prohibition with U-turn were proposed. In evaluation the design schemes, the software VISSIM is used to simulate the different plans. The simulation results show that the effect of left-turn prohibitions with U-turn is obvious with 33.2% and 52.1% reductions in average vehicle delay compared respectively with the phase of left-turn protection and the present situation. Left-turn prohibitions with U-turn may decrease delay and improve the operation efficiency at intersection.