城市平面交叉口左转车辆规避效应特性  

A Study on the Shy Away Effects of Left-turn Vehicles at Urban Intersections

作　　者：秦小琳 杜志刚[1] 陈莹[1] 刘青怡 QIN Xiaolin;DU Zhigang;CHEN Ying;LIU Qingyi(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430063

出　　处：《交通信息与安全》2023年第4期101-110,共10页Journal of Transport Information and Safety

基　　金：国家自然科学基金项目(52072291)资助。

摘　　要：城市道路交叉口交通隔离栏侵入内侧车道建筑限界,导致车辆横向偏移,增加行车风险。为了解城市平面交叉口交通隔离栏对左转车辆规避行为的影响,通过无人机采集3个设有交通隔离栏的平面交叉口车辆视频,提取车辆轨迹、速度、加速度等参数。分析交叉口出口不同车道车辆偏移和速度的分布特性,研究左转车辆规避特性。结果表明:(1)两侧车道上行驶的车辆更倾向于向中间车道偏移,中间车道行驶轨迹则较为稳定;(2)20 m的行程可供驾驶人稳定行驶方向,保持与交通隔离栏的安全横向距离;(3)左侧车道上85%以上车辆远离交通隔离栏行驶,平均偏移距离为0.278 m;右侧车道上60%左右车辆远离右侧行驶,平均偏移距离为0.116 m。(4)左转车辆在出口不同车道的速度分布存在显著差异,其中左侧车道和右侧车道上左转车辆速度分布峰值、横向加速度均值、纵向加速度均值均小于中间车道。以此提出城市道路交叉口的改善方法:(1)增加中分带宽度,提升路侧净距,实现左侧车道名义路权宽度与实际路权宽度一致;(2)增大硬质设施与驾驶人的横向距离;(3)开口段硬质设施优化为柔性,减弱设施心理冲击,降低驾驶负荷;(4)增设路面导流线和反光设施,保证诱导设施的连续性和一致性,提升方向感和速度感,从而减少规避效应过度或不足所带来的安全隐患。When a traffic barrier extends into the boundary of inner lane constructions at an urban road intersection,it may result in lateral deviations of vehicles and traffic risk.To examine how traffic barriers at urban planar intersections affect the avoidance behavior of left-turning vehicles,unmanned aerial vehicles(UAVs)are employed to record vehicle videos at three planar intersections.Subsequently,information of vehicle trajectories,speeds,and accelerations is extracted.The distributions of vehicle offsets and velocities in various lanes at intersection exits are analyzed.Additionally,the avoidance behavior of left-turning vehicles is examined.Results show that:①vehicles not in the middle lane exhibit a greater tendency to shift toward the middle lane,while those in the middle lane maintain a more stable trajectory;②after traveling 20 meters,drivers achieve a stable level of vehicle control,resulting in smooth trajectories and maintaining safe lateral distance with traffic barriers;③over 85%of vehicles in the left lane keep away from the traffic barrier,exhibiting an average lateral offset of 0.278 meters,and about 60%of vehicles in the right lane away from the right side,showing an average offset distance of 0.116 meters;④significant disparities exist in the velocity distribution of left-turning vehicles at various lanes of the interaction exit:the peak velocity,mean lateral acceleration,and mean longitudinal acceleration of left-turning vehicles in the left and right lanes are lower than those observed in the middle lane.Based on these findings,recommendations are made to improve the operation levels of urban road intersections:①enlarge the width of the center divider and improve roadside clearance to align with the desired right-of-way width of the left lane;②increase the lateral distance between rigid facilities and drivers;③optimize rigid facilities in the exits about the flexibility to mitigate their psychological impact and lessen the driving burden;④enhance the presence of roadway guide lin

关 键 词：城市平面交叉口 规避效应 左转车辆 驾驶特性 优化方法 

分 类 号：U491.59[交通运输工程—交通运输规划与管理]