Abstract
Urban resilience has become one of the core arguments of sustainable urban development. The urban road system should also respond effectively to various changes or impacts and reduce the uncertainty and vulnerability of road network caused by emergencies. A route choice model considering the vulnerability was proposed. The model analyzed the traveler’ behavior in complex road network. The model is validated by the road network in Chongqing city. First, the vulnerability of road network in mountainous cities is defined, and the failure situation and state classification of road network considering vulnerability are analyzed. The results show that travelers with different sensitive states have obvious different route choice behavior in vulnerable networks. Since nonsensitive users do not reserve travel time in the early days, they are more inclined to respond to emergencies quickly and then choose fast detour paths. However, sensitive users have set off earlier than normal time and have psychological expectations of emergencies. They have more time to maintain the existing path. Finally, a calculation example is used to test that a certain section of the road network fails randomly, and network users can effectively choose the individual optimal route under different failure states.
Highlights
E scenario analysis method is usually used to describe all possible scenarios
Albert et al used this method to study the structural vulnerability of North American power grid [5], but this method can only be limited to the hypothetical attack strategy and cannot exhaust all kinds of possibilities like the scenario analysis method
Road section failure in mountainous city caused by the vulnerability mainly in the following aspects: one is bad weather or traffic control, which reduces the speed limit of the road, reduces the traffic capacity and causes congestion due to partial failure of the road section. e other is that the sudden traffic accidents in some sections lead to the closure or partial closure, resulting in a sudden drop in traffic capacity. ere may be two failure states: complete failure and partial failure. e failure probability of the road section is defined as the probability of failure state
Summary
Mountainous City. e vulnerability of the mountain city traffic network refers to the sensitivity of the system to abnormal events that can significantly reduce the performance of the mountain city traffic system. ese abnormal events can be predictable or unpredictable, inevitable or accidental, and manmade or natural. E vulnerability of the mountain city traffic network refers to the sensitivity of the system to abnormal events that can significantly reduce the performance of the mountain city traffic system. The road network in mountainous cities has the characteristics of high nonlinear coefficient, large slope, few replaceable roads, and high road interchange probability. E main components of traffic network vulnerability in mountainous city include the probability of the function failure caused by the occurrence of hazardous events in the nodes, sections and the whole system of the traffic network in mountainous city and the consequences. E definition of hazardous events includes small probability emergencies and normal hazardous events. As for the measurement of the consequences, it mainly studies the generalized cost and delay of the vehicles in the urban transportation network
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