基于交通冲突分析的公路信号交叉口安全评价

Safety Evaluation of Signalized Intersections Using Traffic Conflict Technique

交通冲突分析技术是以大样本、快速、定量研究评价交通安全现状与改善效果的特点而异于事故统计评价方法。文中通过对信号平面交叉口道路交通条件及交通冲突数据的分析研究,引入综合影响系数,运用灰色关联理论对交通冲突影响因素进行分析,建立了信号平面交叉口道路交通条件与交通冲突率的关系模型,并提出了基于交通冲突的信号平面交叉口交通安全评价的综合影响系数方法。根据交叉口的交通流量、相交道路流量比、交通组成及左转车比例等因素,确定对交通冲突率的综合影响系数K,进而得出交叉口的安全水平等级。

Traffic conflict technique is a new evaluating method using non-accident statistics in traffic safety field. It rapidly and quantitatively evaluates traffic safety situation with multi-stylebook and is different from accident statistic evaluation method. Trough analyzing the road conditions and traffic from signalized intersections＂ traffic conflict data, and based on ＂influencing coefficient＂ concept, the relation model between the signalized intersections＂ road and traffic conditions and traffic conflict data is established in this paper. Synthetic influencing coefficient, which is a method to evaluate signalized intersection safety, is presented based on traffic conflict. According to the traffic flow, ratio of intersection traffic, traffic composition and ratio of left turn vehicles, a synthetic influencing coefficient K on traffic conflict rate can be estimated, and the degree of traffic safety can be determined.