双车道公路弯道回旋线长度对行车特性的影响

Effect of Spiral Length on Driving Characteristics in Curves on Two-lane Highway

摘要:

基于驾驶模拟实验，采集了15名驾驶员在半径为100~500 m的72个弯道路段的车速、侧向偏移等数据，研究双车道公路弯道路段回旋线长度对车速及行车轨迹的影响。结果表明：在半径一定的条件下，随着回旋线长度增加，前后路段车速差呈上升趋势，而速度梯度随之下降；行车轨迹波动幅度随回旋线长度增加而增大，而波动频率随之降低；半径为100 m时，回旋线太短会使轨迹的局部曲率增大；对于半径为200 m的弯道，过长或过短的回旋线都会造成车辆轨迹的局部曲率增大；对于半径为300 m及以上的弯道，回旋线长度和车辆轨迹的最大局部曲率成正相关。

关键词:道路几何设计;回旋线长度;驾驶模拟;速度一致性;行车轨迹

Abstract:

Based on driving simulation experiments， the speed and lateral offset data of 15 drivers in 72 curve sections with the radius of 100?500 m were collected， and the effects of spiral length on vehicle speed and trajectory on two-lane highway were analyzed. The results show that under the condition of a certain radius， with the increase of spiral length， the speed difference is on the rise， while the speed gradient is on the decline. With the increase of spiral length， the fluctuation amplitude of vehicle trajectory increases， while the fluctuation frequency of vehicle trajectory decreases. When the radius is 100 m， the local curvature of vehicle trajectory will increase if the spiral is too short. For the curves with the radius of 200 m， the local curvature of vehicle trajectory will increase if the spiral is too long or too short. For the curves with the radius of 300 m or more， the length of spiral is positively related to the maximum local curvature of driving trajectory.

Key words:road geometric design;length of spiral;driving simulation;speed consistency;driving trajectory