Abstract:With the increase of motor vehicle population, the congestion of urban road network is becoming more and more serious. As the throat of the urban road network, the service level of the intersection directly affects the operation efficiency of the road network. Taking the intersection of Minzu Road-Xinhua Road in Chongqing as an example, the existing problems of the intersection are clarified according to the traffic survey data. The modeling analysis on this intersection is carried out by using Synchro (design software). After optimizing the signal timing and dividing the lane functions, the intersection delay is reduced by 71.6% and the level of service is improved from D to B. Meanwhile, the VISSIM (simulation software) is used to carry out the modeling analysis on the overall road network of Jiefangbei Business Area in Yuzhong District of Chongqing and the regional road network affected by this key intersection. The vehicle operation conditions before and after optimization of road network are compared. The results show that the average delay of the affected regional road network is reduced by 17.74%, the average driving time is decreased by 13.46%, and the average number of stops is reduced by 17.18%. The vehicle exhaust emission is reduced to some extent through the optimization. The optimization of the key intersection can obviously improve the operation efficiency of road network.
