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道路交通网络脆弱性是道路网络单元遭到突发事件攻击后在路网单元间相互作用以及外界持续影响下引起的路网整体损失的量度.道路交通网络脆弱性评估除了考虑路网内部单元间相互作用外还应考虑路网节点单元的恢复能力.本文在提出路网脆弱性的概念和分析模型的基础上，综合考虑路网结构、交通流运行状态、应急救援点设置等因素，以路网用户最终损失旅行时间为测度进行了路网脆弱性评估.通过一个简单的路网进行了实例分析，并从新建、改扩建道路、改变救援点设置等方面提出了改善的建议.

Vulnerability Analysis of Road Networks

Vulnerability of road networks measures the total loss of the network caused by sudden attack with consideration of the interactions among the units and the conscious external influences.When evaluating the vulnerability of the road network,reciprocity among units and the recovery ability of the network should be considered.The paper presents a method for vulnerability evaluation on the basis of the conception and the analysis model of the road network vulnerability.It examines the network vulnerability through final travel time loss of road user and takes sufficient consideration of the structure of the network,traffic flow state and the setting of the rescue center.A simple case study is conducted to illustrate the approach and some suggestions are proposed in terms of adding or rebuilding roads and re-locating the rescue sites.