基于冲突严重性划分的公路平交口安全评价

以公路平交口为研究对象,引入交通冲突技术定量分析交通安全状况,提出应考虑不同严重程度的冲突对交通安全的影响。通过录像观测冲突距离、冲突速度参数,间接获得了一般冲突和严重冲突的TTC指标,并借助累积频率分析的方法,界定出我国公路平交口交通冲突严重性的判定标准,为冲突的分类采集提供了依据。结合对交通量参数的观测,以分时段不同严重程度的冲突数与交通量的比值作为评价指标,运用灰色理论的相关计算方法,对多项评价指标进行聚类分析,得到所调查的8个公路平交口的安全评价结果。

Traffic Safety Evaluation on Highway Intersection Based on Severity Division of Traffic Conflict

Regarded highway intersection as research object,traffic conflict technology was introduced to evaluate traffic safety quantitatively,it was proposed that different severities of traffic conflict should be considered in traffic safety evaluation.TTC(time to collision) was obtained indirectly through observation of distance of conflict and velocity of conflict vehicle by video,and the severity judgment criterion of traffic conflict at highway intersection was gotten eventually with using the method of cumulative frequency analysis.Combined with data collection of traffic volume,the ratios of conflict count of different severities to traffic volume were chosen as indices,and gray theory was used as calculating method to deal with indices through clustering analysis.The evaluation result of 8 highway intersections was used to verify the related conclusions.