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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 VTR camera is used to record the lateral position of the vehicle through the observation section and the distance between the front wheel and the road centerline of the vehicle by Virtualdub video analysis software. According to the statistical analysis results of the test data, the following main conclusions are obtained: When the vehicle enters the curve segment, there is a movement trend of the driving trajectory that deviates toward the inner side of the curve; in the curve of the curve Segment, the vehicle trajectory tends to deviate towards the outside of the curve; the radius of the flat curve has a significant effect on the vehicle trajectory characteristics; the larger the flat curve radius, the smaller the lateral offset of the trajectory, and vice versa; on the whole The more flat the corner of the curve is, the smaller the rate of change of curvature is. The smaller the lateral displacement of the driving trajectory is, the more the curvature of the curve is linearly and positively correlated with the maximum lateral offset of the trajectory of the curve segment.