中文摘要：

建立了基于连续Petri网的城市交通网络模型。采用层次化的建模方法，首先构建整个交通网络系统的大框架模型，然后对其构成的关键要素——交叉口给出细化模型。交叉口模型清晰地描述了各个方向的交通流在道路交叉口处的转向行为和转向延误信息。体现路段阻抗和节点阻抗的时延因素的引入，使得模型能更加真实地反映交通网络的动态特性，为后续动态路径的诱导和交通控制提供思路。

英文摘要：

A model of urban traffic network based on Petri net was proposed. A kind of hierarchical modeling method was used. Firstly, a frame model of the whole urban traffic network was given, then detail models of intersections which were key elements of the traffic system were refined. The model of intersection described the turning direction and turn delay information of each traffic flow explicitly. The time factor which reflects the impedance of sections and nodes was intro- duced. As a resuh, the total model could not only reflect the dynamics of traffic network, also provide ideas for the choice of optimal path and suboptimal traffic control plan.