Volume 41 Issue 4
Aug.  2023
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Article Navigation >  Journal of Transport Information and Safety  > 2023  >  41(4): 101-110
QIN Xiaolin, DU Zhigang, CHEN Ying, LIU Qingyi. A Study on the Shy Away Effects of Left-turn Vehicles at Urban Intersections[J]. Journal of Transport Information and Safety, 2023, 41(4): 101-110. doi: 10.3963/j.jssn.1674-4861.2023.04.011
Citation: QIN Xiaolin, DU Zhigang, CHEN Ying, LIU Qingyi. A Study on the Shy Away Effects of Left-turn Vehicles at Urban Intersections[J]. Journal of Transport Information and Safety, 2023, 41(4): 101-110. doi: 10.3963/j.jssn.1674-4861.2023.04.011
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A Study on the Shy Away Effects of Left-turn Vehicles at Urban Intersections

doi: 10.3963/j.jssn.1674-4861.2023.04.011

  • School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China

  • Received Date: 2023-02-21
    Available Online: 2023-11-23
    Abstract
  • 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 lines and reflective facilities to ensure the uninterrupted and uniform implementation of guiding elements and to boost drivers' perception of direction and speed, consequently to reduce the safety risks associated with over- or under-shy away effects.

     

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