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基于排队长度的单点自适应信号控制方法
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摘要
为了满足瓶颈路口全天候实时交通信号控制要求,本文引入了排队长度分析路口交通需求,提出了基于排队长度的单点自适应信号控制方法。首先,通过视频检测路口各车道的交通流量、绿灯结束排队长度、红灯结束排队长度等交通参数;然后分析各相位的交通需求,优化各相位的绿灯时间,并通过排队长度、最大绿灯时间、最小绿灯时间等条件来约束、校核优化方案的合理性;最后分析路口清空率、空放率、饱和度等技术指标来反馈路口的控制效果。现场应用表明,本文提出的算法能全天候实时适应路口变化的交通流,有效提高路口的通行效率。
In order to meet traffic signal control requirement of the road intersection with heavy traffic demand and large traffic flow variation,the vehicle queue length is introduced as the key element to analysis the real-time traffic demands and an adaptive signal control algorithm for the signal intersection based on queue length is developed in this paper.Firstly,road traffic variables such as queue lengths at the end of green light and the end of red light,traffic flow for each lane are derived from the purposely installed road traffic monitoring video cameras.Secondly,the green time of every phase is calculated through optimization by the input traffic demand and the queue length subject to the constraints of the maximum and minimum green time.Critical technical performance indicators including vehicle queue eliminating rate and void green time rate are used to evaluate the algorithm's control efficiency.Road intersection application shows that the proposed algorithm is able to deal with the large variation of heavy traffic flow under different weather conditions and can improve the intersection traffic flow significantly.
引文
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