山区高速公路连续下坡路段区间运行车速特征分析

利用K-means聚类分析方法,对山区高速公路各车型进行分类研究,并分析了交通事故数据与区间运行车速的相关性.结果表明：小客车、大中型客车速度特性差异较大,五、六轴货车与二至四轴货车运行速度特征差异明显;超车数、区间运行速度差、区间运行速度变化系数、区间运行速度标准差等参数对于山区高速公路的安全评价具有重要作用.山区高速公路的运行速度特性研究结论,可为运行速度设计方法、公路项目安全性评价、限速方案的制定奠定良好的应用基础.

Research on Operating Speed Characteristics of Long and Steep Downhill on Mountainous Freeway

The classification of different vehicle types was analyzed by K-means clustering method.Results show that the speed divergence of passenger cars and buses is higher than the trucks.There was a marked difference between trucks with five-axle or six-axle and trucks with double-axle to four-axle in operating speed characteristics.The number of overtake,interval speed difference between adjacent sections,interval speed ration on adjacent sections and interval speed standard deviation are the key parameters to characterize operating speed.The conclusions of operating speed characteristics of mountainous freeway can establish a foundation of operating speed design method,highway safety evaluation and establishment of speed limit.