Abstract: In order to improve the traditional way of judging the operation status of urban road traffic, a method of judging the operation state of urban road traffic based on set pair analysis and triangular fuzzy number α-cut set was proposed, according to the analysis of the evaluation method of traffic operation state at home and abroad. In the proposed method, the average travel speed, the ratio of road congestion mileage, the ratio of travel time and the ratio of road network delay time were taken as the discriminant indexes. Set pair H (An, Bk) was composed of set An (measured data) and set Bk (criteria for discriminating indicators), furthermore, the hierarchical relationship between similarities, differences and inverses of set pair theory was analyzed. Based on the coupling of set pair analysis and triangular fuzzy number α-cut set, the expression of connection degree was constructed, and the comprehensive evaluation model of weight and construction connection number was determined. Taking the measured data of the eastern section of the South Second Ring Road in Xian as an example, the proposed method was proved to be more accurate to reflect the road operation, through comparison and analysis with the traditional evaluation results.

Key words: traffic engineering, urban road, traffic flow, running state, set pair analysis

摘要： 为改进传统的城市道路交通运行状态判别方法，首先在分析国内外交通运行状态评价方法的基础上，提出了基于集对分析与三角模糊数α-截集耦合的城市道路交通运行状态判别方法。该方法以车辆平均行程车速、道路拥堵里程比例、行程时间比、道路网延误时间比作为判别指标。将集合An(实测数据)与集合Bk(判别指标标准构成)构成集对H(An, Bk)，从而对集对理论同异反层次结构关系进行分析。构建了基于集对分析与三角模糊数α-截集耦合的联系度表达式，确定了权重与构建联系数综合评价模型。以西安市南二环东段实测数据为例，通过与传统评价结果对比分析证明了该方法可更加准确地反映道路运行状态。

关键词: 交通工程, 城市道路, 交通流, 运行状态, 集对分析