Grade Of Urban Traffic Emergency Of Coupling Of Multiple Accidents

With the rapid development of urbanization and motorization, coupling of multiple emergencies occurred frequently, which has threatened the hard-pressed urban traffic system. Traffic emergency disposal of coupling of multiple accidents has become one of the hotspots and difficulties of the urban and traffic research. In order to deal with accident quickly and effectively after coupling of accident and reduce loss, traffic department must evaluate grade of traffic emergency correctly and rapidly as to take corresponding traffic emergency plan. Currently, there are few researches on classification of traffic emergency response. In addition, the previous researches are qualitative, lacking of quantitative model. Taking the National soft science research program-urban traffic emergency decision support system of coupling of multiple emergencies for background, this paper discussed the grade of traffic emergency of coupling of multiple accidents. The researches of this paper are as follows:(1) Taking such disaster accidents involved in traffic system as fire, explosion, leakage of dangerous goods and traffic accident as study objects, the characteristics of accidents and their traffic characteristics were analyzed in detail. Coupling of multiple accidents were analyzed and classified, and the characteristics of coupling of accident and relationship between accident and traffic system were analyzed.(2) Based on the analysis of characteristics, the influence factors of grade of traffic emergency were extracted. With the thought of analytic hierarchy process, the initial evaluation index system was established from two aspects, such as urgent degree of traffic response and difficult degree of traffic rescue. The expert experience and fuzzy prioritization method were used to optimize the initial index system and a comprehensive evaluation index system of traffic response grading was proposed. Each index was defined.(3) The threshold criteria of each index were established through analyzing relevant national standard, classifications criteria of accident, classifications standard of emergency evacuation and relavant references.(4) Considering the limitation of traditional analytic hierarchy process, the fuzzy analytic hierarchy process based on triangular fuzzy number was introduced to calculate weight of each index. Grading model of traffic emergency was established by fuzzy comprehensive evaluation. The traffic emergency grade evaluation software system was developed using MATLAB software.The results of this paper can provide certain guidance for traffic department when they deal with coupling of accident, which will contribute to implement traffic emergency plan rapidly and effectively and reduce society loss to greatest extent.