The Application of VISSIM in the Intersection at Grade of Urban Road Nanshaomen Intersection for Example

The intersection at grade of urban road is an important part in road system, once the intersection appears traffic jam, the traffic effective operation can be affected. How to improve the capacity of the intersection means very important. Traffic simulation is an effective way to solve traffic problems. It utilizes modern computer technology to realize practical traffic system specialty, analyzes traffic system´s probable action in sorts of limited condition. In this paper, regarding Nanshaomen intersection as studying target, the existing problems in present intersection are found and the reasonable signal timing scheme and traffic lane divider scheme in intersection are put forward with the help of VISSIM, on the basis of investigation the present traffic quantity in peak time, signal timing scheme and traffic lane function divider. The improved scheme is evaluated on motor vehicles travel time, speed, line up length. The result indicates the scheme can reduce the vehicle delay and improve the capacity of the intersection effectively, and the application of VISSIM in the intersection at grade of urban road can get to good effect. It provides the effective reference to solve increasingly serious traffic jam in the intersection at grade of urban road.