信号交叉口左转待转区的仿真实现及评价

Simulation and Evaluation of the Left-turn Waiting Zone at Signalized Intersection

为了模拟信号交叉口机动车左转待转区的交通流运行情况,定量分析左转待转区的实施效果,介绍了左转待转区的基本适用条件,建立了左转待转区的仿真模型,选择了车流量作为效果评价指标。在实地调查的基础上,采用了微观仿真软件Vissim进行交叉口交通运行状况模拟。仿真分析发现,设置左转待转区后,3个不同时段下信号交叉口左转进口道通行能力分别提高了5.9%、4.3%和6.7%。结果表明,交叉口设置左转待转区后,在不影响行车安全的情况下,可以提高信号交叉口的通行效率。

In order to simulate traffic operations of the left-turn waiting zone （LWZ） at signalized intersection to quantitatively evaluate the operational performances after the implementation of the LWZ, following the introduction of the concept of the LWZ, the modeling method of the LWZ was established, and the simulation evaluation volumes indexes were selected. Based on the data investigation, the simulation model was applied to a typical signalized intersection with left-turn lanes by microsimulation software Vissim to evaluate the efficiency of the traffic operation. It is found that compared with the layout of lacking LWZ, the left-turn traffic capacity at signalized intersection increased by 5.9, 4.3 and 6.7 percent in three different periods of traffic levels respectively after using the LWZ. The results show that optimizing the layout of the intersection by using the LWZ can improve the operation efficiency without affecting the traffic safety.