城市快速路交通拥堵判定方法研究

为弥补单点检测器判定交通拥堵方法研究的不足,在对实测数据分析的基础上,利用临界占有率将交通流状态划分为拥堵状态与非拥堵状态,提出了以速度-占有率比、速度差双指标判定交通拥堵状态发生、结束时刻的方法。并以北京城市快速路实测数据为例,对各判定指标阈值进行标定,判定结果表明:基于单点检测器设计的拥堵判定方法能够有效判定检测器断面拥堵发生时间、持续时间、结束时间。 

Traffic Congestion Identification Method for Urban Expressway

In order to make up inadequate research on traffic congestion identification by single detector ,this study focuses on using actual single detector data to recognize congestion .Based on analyzing the field traffic data ,critical occu-pancy can divide the state of traffic flow into congested and uncongested flow .Speed to occupancy ratio and speed differ-ence can design a multiple indicator identification method to determine the time of congestion occurrence and end time .Fi-nally ,after three indicators threshold are calibrated ,this identification method is applied to Beijing urban expressway . The result shows that this method can identify congestion effectively in starting time ,duration ,and finishing time .