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提出将交通冲突分为一般冲突及严重冲突2类，综合考虑交叉口多时段的交通状况，以典型时段的时均冲突率（冲突数与当量交通量的比值）作为评价指标，对公路平交口的交通安全状况进行定量评价。通过采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，得到对所调查的8个公路平交口的安全评价结果，并与传统的评价过程进行比较。

Traffic Safety Evaluation on Highway Intersection Based on Severity of Traffic Conflict and Gray Theory

This article dicides traffic into2 types:commmon conflict and severe conflict and chooses the ratio between the number of traffic conflicts and traffic volume in typical periods as indices on the consideration of the whole traffic condition on highway intersection. At last, this article use gray theory to evaluate the condition of 8 highway intersections quantitatively and compare the results with traditional method.