Research on the evaluation of emergency response capacity of freeway emergencies based on cloud hierarchy analysis

In order to cope with all kinds of emergencies on the freeway and improve the emergency response capability of the freeway system, the emergency response capability of the freeway road network is quantitatively assessed. Based on the system resilience theory, a freeway emergency response capability assessment index system is constructed from three aspects: resistance capability, adaptive capability and recovery and optimization capability. The concept of cloud model is introduced, and the traditional hierarchical analysis scalar theory is modified to show the randomness, fuzziness and dispersion of the evaluation system with three numerical characteristics of expectation, entropy and super entropy, so as to determine the relative weight of each index and the cloud numerical characteristics of risk value; finally, the cloud model is used to quantify the randomness and fuzziness of each index, generate the cloud map of each risk evaluation level, and obtain the overall evaluation results. The results show that the overall emergency response capability score is 91.646, which is in the good level and should focus on strengthening the road network recovery and optimization capability and adaptive capability construction to improve the comprehensive resilience of the road network. This method can be used to quantitatively assess the emergency response capability of the freeway network and provide a scientific basis for the improvement of the emergency management capability of the road network system.