Abstract: In order to accurately evaluate the level of freeway traffic safety, this paper analyzed the characteristics of accidents on freeway and the factors affecting the freeway traffic safety, established an evaluation index system for freeway traffic safety, and constructed a comprehensive evaluation model based on hierarchical entropy and a comprehensive evaluation model based on vector similarity. The hierarchical entropy evaluation model used the analytic hierarchy process(AHP) and the entropy weight method to determine the subjective and objective weights of the evaluation indexes, the weighted average of the index data and the evaluation results. The vector similarity evaluation model used the vector similarity degree to analyze the traffic safety status of the freeway and conduct a comprehensive analysis. The two models were used to evaluate the traffic safety level of the freeway in Jiangsu Province. The results show that the traffic safety level of freeway in Jiangsu Province is high and the evaluation results are consistent with the actual situation.

Key words: freeway, traffic safety, comprehensive evaluation, hierarchical entropy, combination of subjective and objective, vector similarity