Research on evaluation indexes for emergency-based urban traffic network

Considering emergencies factors on the impact of road network, the author puts forward the evaluation index of traffic state for the description the road traffic congestion under emergency condition, while compares analysis of the network traffic congestion sensitivity by using of the VHT/VKT method. Then, through the software VISSIM to make simulation and verification, and the results indicates the evaluation index system can be real-time accurately judge road traffic state. Meanwhile, it can get the profile of intersection and network congestion degree, which provide auxiliary decision support for emergency traffic evacuation and rescue.