Interval Comprehensive Evaluation Model for Traffic Safety of the Expressway Based on the Closeness Coefficient

On the basis of setting up the evaluation standard of safety levels, it adopts the membership function and gets the quantized evaluation index of traffic safety of the expressway. In this paper, the rating of each alternative is described by interval numbers. According to the concept of the TOPSIS, a closeness coefficient is defined to determine the ranking order of all alternatives by calculating the distances to both the interval ideal solution and interval anti-ideal solution. The comprehensive evaluation model of traffic safety of the expressway is set up by using TOPSIS. The new model is proposed to calculate the distance between interval numbers and membership function. And it carries a comprehensive evaluation on the existing expressway safety for four provinces in China. Finally, it was applied to the practical evaluation and some positive results were obtained. Applied results indicate that the method is feasible.