城市快速路交通拥挤分析及拥挤阈值的确定

Analysis of Traffic Congestion on Urban Expressway and Congestion Threshold Identification

基于实测数据和交通流模型,划分了六种典型交通状态,提出了"状态跳转"的概念及判别方法以解释拥挤机理;对比了状态跳转与B S Kerner的"相变"理论的差异及其随路段、时段的变化规律;最后给出了拥挤阈值的定义、指标、确定方法,分析了影响因素及与交通控制的关系.研究结果可为选择合适的交通控制措施及确定最佳控制时机提供依据.

The paper presents a classification of six typical traffic states based on real-detected data and traffic flow model, and then an introduction of the definition and identification method of ＂state transition＂ to explain congestion mechanism. A comparison is conducted between ＂State transition＂ and B S Kerner＇s ＂phase transition＂, and an analysis is made of its characteristics at different sections and in different hours. Finally, the definition, index, identification method of congestion threshold are presented, and impact factors, the relation between congestion threshold and traffic control are analyzed. This study provides a reference for choosing suitable traffic control strategies and deciding the optimal occasion for traffic control.