��ͨ�����ȷֲ��µ�˫���·�����������ɿ��Է���

实际交通管理中，为了提高道路的利用率，减缓交通拥挤，交通规划与管理者在规划设计时会尽量将交通流均匀分布在各路段上，或者利用一定的交通管制方法将双向道路上不均匀 流量转为均匀流量，这样既不需要投资增加路段能力，又能充分利用现有资源。根据这种思想，张和高(2006)提出了交通流均匀分布下的双向道路网络设计模型，但是原有问题目标函数只是求系统总阻杭最小和交通流不均匀分布度最小，这对于网络可靠性分析来说不太适用，本文分别分析了这两种目标函数下的交通网络的连通可靠性，结果表明了这种道路调整方法对系统的连通可靠性有一定提高.

Reliability Analysis of Urban Transportation Two-Way Road Network Design Problem with System Equilibrium Objective

In reality, traffic planers and administrators will try to well distribute the traffic flow on each road section or change the asymmetric flow on two-way road into even flow by traffic control in order to improve road utilization ratio and alleviate congestions. Thus, it does not need investment for additive road capacity and can make full use of the existing resources. Based on this idea, Zhang and Gao (2006) presented a model of urban transportation two-way road network design with equilibrium objective. But the model objective function just pursues the minimum of system total impedance and traffic flow asymmetry distribution. It is unsuited for network reliability analysis. The paper analyzed the reliability of transportation network respectively under the two objective functions and the result indicated the realocating lane capacity makes connectivity reliability and performance improving.