Abstract:

According to the nonlinearity, uncertainty and fuzziness of the traffic in the urban road network, by combining the urban road and the expressway, a controloriented macroscopic dynamic traffic flow discrete model for the complex urban road network is proposed. Taking the blocks as base points, the urban traffic network system was divided into two subsystems: cross road and oneway ring road. The two subsystems’ macroscopic dynamic models were presented respectively and the relation among two models was also discussed. Computer simulation with actual Xi’an traffic flow data shows that the traffic model can accurately express the traffic flow information in the urban road network preferably and be used for the urban traffic control system analysis and design.

Key words: traffic engineering;traffic flow model;road network;intersection