双车道公路弯道行车轨迹特性研究

Study on Characteristics of Vehicle Path in Curves on Two-lane Highways

采用VTR摄像机记录车辆通过观测断面处的侧向位置,应用Virtualdub视频分析软件判读车辆外侧前轮至道路中心线的距离。选取典型双车道公路上8处曲线为试验段,根据试验数据的统计分析结果,得到以下主要研究结论:车辆在进入曲线段时,行驶轨迹存在着朝曲线内侧偏移的运动趋势;在出曲线段时,车辆行驶轨迹趋向朝曲线外侧偏移;平曲线半径大小对车辆行驶轨迹特性有显著的影响,平曲线半径越大,行车轨迹侧向偏移量越小,反之则越大;总体上看,平曲线转角变化越缓和,曲率变化率越小,行车轨迹侧向偏移量越小,曲率变化率与曲线段的行车轨迹最大侧向偏移量呈显著的线性正相关关系。

The lateral positions while vehicles passing experimental observation sections were recorded by using video tape recorder（VTR）cameras,the distance from outside front wheel of vehicles to centerline of highway was identified by applying video process software VirtualDub.According to statistical analsis results of experimental data collected in eight curves on typical two-lane highway,it is concluded that（1） the path has a tendency to shift inward the curves as vehicles entering the curves and tend to shift outward the curves as vehicles exiting the curves;（2） the radius of horizontal curve has significant impact on the characteristic of vehicle path,the larger the radius of curve is,the smaller the lateral displacement of vehicle path,whereas the greater it would be;（3） generally,the more smooth the deflection angle of horizontal curves,the smaller the curvature change rate（CCR） is,the smaller the lateral displacement of vehicle path is,and CCR has significantly linear positive relationship with the maximum lateral displacement of vehicle path in curves.