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通过运用VISSIM交通仿真系统对有两个分离左转车道的道路交叉口实例进行仿真，研究外侧左转车流对内侧左转车流延误的影响.在VISSIM交通仿真运算中，以内侧左转车流的交通流参数为常量，与之相对应的外侧左转车流的交通流参数为变量，得到仿真运算后的离散数据.将这些数据进行回归分析，得出内侧左转车流延误的影响因素模型.最后基于仿真运算的研究成果及此交叉口的特性,提出合理的交通改善措施，将改善后每个周期的内侧左转延误及交叉口的车均延误与改善前的延误进行比较.结果表明，所提出的改善措施有显著效果，对其他同类型的有两个分离左转车道交叉口的改造具有实际的指导意义.

Delay Analysison Inside Left-turning Flow Based on VISSIM Simulation

Taking the intersection with two separate left-turning lanes as an example,this paper analyzes the delay of inside left-turning flow which is always affected by lateral left-turning flow through VISSIM simulation system.In the process of simulation,the traffic flow parameters of the inside left-turning lane are set as constants while the corresponding parameters of the lateral left-turning lane are to be variables,and then the discrete data is obtained.The linear regression is conducted and the influence factor model is obtained for the inside left-turning delay.Furthermore,the paper proposes some improvement measures based on the simulation results.From the comparisons of the delay of inside left-turning and the intersection at each cycle that before and after the improvement,is the measures are proven to be effective.It also provides references for other similar intersections.