基于VISSIM的城市交叉口改善优化研究

Research on City Intersection Improvement and Optimization Based on VISSIM

首先系统地阐述了城市交叉口改善优化的现有研究成果,然后介绍了微观交通仿真软件VISSIM的模型及理论基础以及用于评价交叉口性能的行程时间、平均延误、排队长度、停车次数、通行能力、饱和度和服务水平等评价指标;以广州市花地大道与浣花路交叉口为例,通过信号交叉口调查数据的统计分析,从时空交通设计优化方面提出交叉口优化方案,并利用VISSIM交通仿真软件对交叉口的现状和优化方案进行仿真研究。结果表明,对交叉口进行时空改善优化后,交叉口的饱和度由1.24减小到0.91,平均每车延误由71.6 s减少到47.1 s,服务水平由E提高到D。实践表明,该方法具有良好的操作性和实用性。

The existing research result on city intersection improvement and optimization is systematically presented firstly, then the models and theories of microcosmic traffic simulation software VISSIM are described, the indicator of the space time, the mean delay , queue length, parking rate, capacity, saturation degree and LOS （level of service） which is used to value the intersections performance is analyzed. Taking the HuDi Road and HuanHua Road intersection of GuangZhou for example, the improved intersection optimal planning from time and space angles to optimal signal control and road design is put forward by surveying and analyzing data got from practical research of signalized intersection, and then software VISSIM is used to simulate the intersection＇s condition and the improved intersection optimal planning. The result shows that the saturation degree of the intersection may decrease from 1.24 to 0.91, the mean delay may decrease from 71.6 seconds to 47.1 seconds and the LOS may be improved from Level E to D after improvement and optimization. It is proved to be a useful and operational method.