Comprehensive evaluation of highway tunnel traffic safety based on improved DSmT

The paper was aimed at solving the problem of fuzziness, uncertainty and conflict in comprehensive evaluation of expressway tunnel traffic safety. Comprehensive evaluation was regarded as a fusion process taking the evaluation index value as information source. Then a new method based on improved DSm T theory was worked out for optimizing the evaluation results, considering both the fuzziness and the restrainability of evaluation indexes. Firstly, cloud model was used to make safety grade cloud and make it as continuous as possible to reduce the constraints of proposition of framework. Secondly, cloud model was used to convert natural language value to quantitative value, and realize GBBA of information sources based on membership cloud. Finally, the evaluation method was verified by a project example of Niuyanshan tunnel in Fujian section of Beijing Taiwan expressway. The results show that the method can be used to deal with quantification of qualitative index, meet the dynamic requirements of index system, and that the evaluation conforms with the actual situation.