Nowadays, the traffic problem is increasingly serious, which has become many cities big concern. This paper studies the microscopic traffic simulation technology home and abroad, mainly introduces the research phase, research content, the achievements as well as the mainstream traffic simulation software. The paper deliberates the affection of roundabout and crossroads for the urban traffic. Firstly, in this paper, the Webster method is quoted to calculate the cycle of signal lamp , and then the time-collocation of signal lamp which is got investigated and surveyed-data are used at the VISSIM to simulate the traffic condition, finally ,it is concluded that the traffic volume of crossroads is slight better than the roundabout.
traffic management, traffic signal control, VISSIM micro simulation, signal lamp interval time
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