Volume 40 Issue 4
Aug.  2022
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DAI Zhenhua, LIAO Qishuo, PAN Cunshu, SHANG Yanyu, XU Jin. An Analysis of Trajectory Streamline and Curvature Characteristics of Right-turn Vehicles at Urban Arterial Road Intersections[J]. Journal of Transport Information and Safety, 2022, 40(4): 157-166. doi: 10.3963/j.jssn.1674-4861.2022.04.017
Citation: DAI Zhenhua, LIAO Qishuo, PAN Cunshu, SHANG Yanyu, XU Jin. An Analysis of Trajectory Streamline and Curvature Characteristics of Right-turn Vehicles at Urban Arterial Road Intersections[J]. Journal of Transport Information and Safety, 2022, 40(4): 157-166. doi: 10.3963/j.jssn.1674-4861.2022.04.017

An Analysis of Trajectory Streamline and Curvature Characteristics of Right-turn Vehicles at Urban Arterial Road Intersections

doi: 10.3963/j.jssn.1674-4861.2022.04.017
  • Received Date: 2022-03-17
    Available Online: 2022-09-17
  • A drone was used to take high-altitude images of four urban road intersections in Chongqing to study the trajectory characteristics and curvature patterns of right-turn vehicles at urban arterial road intersections. The trajectory data of right-turn vehicles, including time, driving speed, and trajectory coordinates, are collected by using image analysis methods, based on which the trajectory curvature of vehicles is obtained by calculating the radius of circumcircle of adjacent trajectory points. The relationship between the distribution of passing positions of right-turn vehicles and the geometric layout of intersections is analyzed by using the distance between the trajectory line and the curb line, and the trajectory characteristics of right-turn vehicles at the intersections are further studied. Six types of curvature patterns of the trajectories of right-turn vehicles are identified based on a clustering method, and common driving behaviors under different curvature patterns are determined, and the relationship between vehicle speed and trajectory curvature is finally investigated. The results reveal the following conclusions. ① The geometric layout (including the curb radius, lane width, and the number of exit lanes) has impacts on the distribution of trajectories of right-turn vehicles. ②Right-turn lanes with channelized design can limit the distribution of trajectories and reduce conflicts and delays in right-turn traffic. ③ During a process of right-turning, more lateral space is required by buses than by cars, and the distribution of trajectories is less discrete. ④The key points of trajectory curvature are inconsistent with the trends of the main points in the circular curve design. ⑤ The acceleration of a vehicle has a negative correlation with the change rate of the trajectory curvature, and the correlation coefficient is -0.8435. ⑥ The driving speed has a positive correlation with the equivalent radius: the faster the vehicle moves, the larger the equivalent radius of the trajectory in the circular curve.

     

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