Abstract: A dynamic taffic assignment model combined with reliability is presented in this paper and the road network reliability is described as the travel trait. Firstly, a simulation-based DTA(dynamic traffic assignment)model is discussed where meso-scopic simulation method is used to simulate vehicles running in packets on the time-varying road network and the time-dependent network performances are described. Secondly, with the help of Wardrop’s equilibrium principle，a dynamic reliability traffic assignment model is put forward. No paths with lower reliability are used and travelers cannot improve the probability of arrival at destination within a specified time by changing route choices. Finally, to illustrate its operation, it is applied to an example network and to simulate the route choice behavior.

Key words: road network, reliability, dynamic traffic assignment, travel trait

摘要： 以道路可靠性作为行程质量指标，建立了结合道路可靠性的动态交通分配模型.首先，给出动态交通分配的流程，以中观模拟的方法建立车辆集合的时变的路网中路径选择，得到基于时间的交通需求在路网中的时空分布;其次，以Wardrop的均衡原理作为平台，建立了考虑道路可靠性质量的动态交通分配模型，达到动态用户最优状态，即在每一步长，每一OD对之间被使用的路径，其可靠性等于该步长内最大的可靠性，且出行者不能通过单方面的改变路径提高其准时到达目的地的概率.最后，通过对模拟结果的分析并验证路网行驶路径动态变化过程.

关键词: 路网, 可靠性, 动态交通分配, 行程质量