Abstract:

In the urban road network, node resistance influence the result of route choice and traffic assignment greatly. To make up for the deficiency of the research on the impedance of the node, optimize traffic assignment method, this paper analyses the existing node structure model. From which the Supernode model based on multi- direction congestion on the basis of the super- node structure and the model algorithm is established and designed after analyzing the turning congestion effort. The model improves the method to express the turning flow and resistance, introducing the principle of route choice. At last, the paper demonstrates traffic assignment process considering turn resistance and not, after that analyses the route resistance variation trend, flow on link and turn of the example network by the capacity restrictionincremental assighment method. The result of numerical example shows the model is more reasonable and effective in expressing the trend of turn resistance and influence from the multi-direction congestion of node.

Key words: urban traffic, multi-direction congestion, incremental assignment, node structure, route choice

摘要：

在城市路网中，节点阻抗极大影响着路径选择及交通分配的结果.为弥补对节点转向阻抗研究的不足，优化路网流量分配，本文分析了已有节点结构模型，并在超点结构基础上，考虑节点转向的拥堵效应，完善对转向流量、阻抗等信息的记录，提出了转向堵塞后的路径选择方法，建立了基于多向堵塞的超点模型，并设计了求解算法.通过容量限制-增量加载的交通分配方法，演示了算例网络在考虑和不考虑节点转向阻抗下的流量分配过程，分析了网络中路径阻抗变化及路段、转向流量分布.结果表明：基于多向堵塞的超点模型可以有效地表达节点的转向阻抗变化，以及多向堵塞对于流量分配的影响，更符合实际中的交通分配.

关键词: 城市交通, 多向堵塞, 增量加载, 节点结构, 路径选择