Abstract: The scientific evaluation of the safety of the interchange off-ramp is of great significance to improve the safety of highway traffic and reduce traffic accidents. In order to evaluate the safety of the interchange off-ramp, the factors from 4 aspects were selected, that is the off-ramp road friction coefficient, turning radius, shift lane length, sight distance and exit sign information. The index of each factor was concretized and the evaluation index system was constructed. The entropy weight matter-element evaluation method was introduced to establish the safety evaluation model of the interchange off-ramp. The case of an interchange off-ramp in Chongqing expressway was selected for evaluation and analysis. The evaluation results show that the quantitative calculation results of the safety evaluation of the interchange off-ramp based on the entropy weight matter-element model are more accurate and objective than those of other evaluation methods. The factors affecting the lower grade of evaluation were analyzed and studied, and the corresponding suggestions and countermeasures were put forward.

Key words: traffic engineering, off-ramp, entropy weight matter-element, evaluation model, safety

摘要： 科学的评价互通立交出口匝道的安全性，对提高高速公路行车安全性、减少交通事故发生具有重要的意义。为评价互通立交出口匝道安全性，选取了出口匝道道路摩擦系数、转弯半径、变速车道长度、行车视距和出口标志信息等4个方面的因素，对各因素指标进行了具体化，构建了评价指标体系。引入熵权物元评价方法，建立了互通立交出口匝道安全评价模型，并选取了重庆高速某互通立交出口匝道为案例进行了评价分析。评价结果表明：基于熵权物元模型的互通立交出口匝道安全评价定量计算结果相比其他评价方法更为准确和客观，并对影响评价等级较低的因素进行分析研究，并提出相应的建议对策。

关键词: 交通工程, 出口匝道, 熵权物元, 评价模型, 安全性