Optimization Research on Unsaturated Intersections Based on Traffic Delay

Intersection is an important part of an urban road network. Vehicle delay at signalized intersections is a significant index of traffic running efficiency and service level. Considering that the principle of the VISSIM simulation method and spot sample method are only used to calculate the traffic delay at the signalized intersection, these two methods have not been used to optimize the signal timing. In order to obtain the signal timing of intersections that create a minimum traffic delay, signalized intersections are researched on in this paper, and an optimization scheme of intersections that is based on a graphical method, and the HCM2000 algorithm is designed. Firstly, we use the graphical method to analyze and calculate the delay of one approach at intersections that are unsaturated. Secondly, we get the optimization scheme of intersections through the HCM2000 algorithm. Thirdly, this scheme is verified with the practical measured GPS data in a city. The results show that the scheme has a perfect feasibility, and the intersection delay of this scheme is improved separately by 5% and 8%.