城市快速路交通流状态跃迁的实证分析  

Empirical Analysis of Phase Transitions of Traffic Flow at Urban Expressway

作　　者：何蜀燕[1] 关伟[1] 

机构地区：[1]北京交通大学交通运输学院,北京100044

出　　处：《中国公路学报》2008年第5期81-86,共6页China Journal of Highway and Transport

基　　金：国家高技术研究发展计划("八六三"计划)项目(2006AA11Z212);教育部科学技术研究重点项目(106031);国家重点基础研究发展计划("九七三"计划)项目(2006CB705507)

摘　　要：根据北京市二环路的实测数据分析了在高交通需求条件下的城市环路交通流特性,研究了交通流在临界密度附近的稳定性和车道间车流的同态性,即速度跃迁概率和车道间交通参数的偏差,结合三相位交通流理论中的同步流概念,将交通流状态划分为4个相位:自由流、高速同步流、低速同步流和堵塞,并通过实测数据分析了交通流在4种状态间的时间和空间演变规律。结果表明:分析得到的交通流状态和状态间时空变化规律,对交通流的短期预测、控制和诱导具有应用价值,同时也为分析交通拥堵机理、建立合理的交通流模型提供了理论基础。Traffic 2nd Ring Road. flow features of urban ring road were analyzed based on empirical data of Beijing Traffic flow stability and synchronization among lanes around critical density were analyzed, ie probabilities of speed transition and deviations of traffic parameters among lanes. Four traffic phases were identified： free flow, high-speed synchronized flow, low-speed synchronized flow and traffic jam combined with concept of synchronized flow in three phases traffic flow theory. Moreover, spatial-temporal evolvement rules of traffic flow based on these four phases were analyzed by empirical data. Results show thai traffic flow phase and spatialtemporal variation rules among phases by analysis have application value for short term prediction, control and inducement of traffic flow. Meanwhile it can provide theoretical base for analysis of traffic congestion mechanism and establishment of traffic flow model.

关 键 词：交通工程 交通流 统计分析 状态跃迁 交通拥堵 同步流 

分 类 号：U491.265[交通运输工程—交通运输规划与管理]