To improve the operational efficiency of an intersection with U-turn median openings and left-turn bays, a new fully-actuated control method for isolated intersections was proposed in a connected vehicle environment with a 100% penetration rate of connected vehicles. The impacts of U-turn median openings, left-turn bays and signal phase schemes on the travel trajectories of different turning vehicles were analyzed. Specifically, it was analyzed that the connective relationship between the left-turn phase and the through phase for the left approach affects the U-turn flow. Based on the directly and real-time acquired turning intentions, positions, speeds and accelerations of connected vehicles, the required green time calculation methods for connected vehicles were proposed. For the left-turn phase and the through phase, respectively, the initial green time calculation methods were presented based on fully releasing all the queued vehicles on each lane group; and the green extension time calculation methods were developed based on the maximization of the saturation degree of each phase and the sliding time window method. Two intersections, three peak traffic demands and sixteen signal phase schemes were considered. The pretimed control method, the traditional fully-actuated control method, and the proposed method were implemented. The orthogonal experimental design method was adopted to determine the optimal parameter combination for the proposed method. 1 728 sets of traffic simulation experiments were conducted using the Python and VISSIM software. The results reveal that compared with the pretimed control method, the proposed method makes the average vehicle delay reduce by 12.13%~32.14% and the average queue length shorten by 15.49%~47.20%. Compared with the traditional fully-actuated control method, the proposed method makes the average vehicle delay reduce by 4.47%~5.71% and the average queue length shorten by 7.90%~16.79%. It can be seen that the proposed method is superior to both the pretimed control method and the traditional fully-actuated control method.
针对车联网环境下设置调头开口和左转短车道的交叉口,本文分析了调头开口、左转短车道和信号相位方案共同影响的交通流运行规律,利用网联车辆转向意图、位置、速度、加速度等实时信息提出车辆驶离交叉口所需绿灯时间计算方法以及新的单点全感应控制(fully-actuated control considering U-turn median openings and left-turn bays in a connected vehicle environment,FAC-UL-CV)方法。
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