客货车速离散性与事故率相关性分析

Correlation analysis between speed discreteness of trucks and passenger cars and accident rate

通过客货车速差、客货车速极差比等表征车速分布特征的指标,建立这些指标在道路不同路段与道路事故率的相关性,结果显示:客货车速极差比与事故率在道路直线段有较好的相关性,极差比越大事故率越高;曲线段客货车速极差比对事故率的影响要大于直线段。

By means of indexes of speed difference and range ratio of speed between trucks and passenger cars which characterise speed distribu- tion, their correlation with rate of accidents were established. The result shows that there is a good correlation between the range ratio of speed be- tween trucks and passenger cars and the rate of accidents in road line segments, the more range ratio between trucks and passenger cars, the more rate of accidents is. The road curve segment＇ s effect of the range ratio between trucks and passenger cars on the rate of accidents is greater than the line segment.