城市路网交通状态分析方法研究

城市路网交通状态分析是智能交通系统中具有理论和实际应用双重性的基础问题,是涉及多尺度、多变量、高度随机和时变的复杂系统分析问题。其难点在于如何建立交通路网模型、如何定义交通状态变量和如何分析路网交通状态。本文对这些问题进行了研究,从中观角度把交通路口参数归入到路段参数,从路段的角度再定义新的路段交通状态系数,并建立用于交通状态分析的路网交通模型。提出了基于可达矩阵的路口分层方法,使用该方法能够得出在不同路段拥挤程度之下的路口层次,得出路口可达性、路段连通性以及整体路网交通状态的判别结果,可以找出路网中关键路口、关键路段,可以得到交通状态的演变方式, 进而为研究交通拥堵形成机理奠定基础。这种分析方法可以直接应用于交通状态分析中,对交通诱导、旅行信息发布也有重要价值。

Study on Method of Traffic State Analysis for Urban Traffic Network

Urban traffic network state analysis is the problem having both theoretic and practical significance in intelligent transportation systems. It is also the problem involving the multi-scale, multivariable, stochastic and time-variable complex system. The difficulties of the problem are how to model traffic network, how to define the traffic state variable and how to analyze the network state. In this paper, these problems are researched. From the point of the medi-scope of view, the intersection parameters are included in the link parameter. The new link traffic state coefficient is defined. And the network model is constructed. Based on the reachable matrix, the hierarchical intersection analysis method is provided which can find the intersection reachability, link connectivity and network state. This method can also find the key intersections and links in the traffic network and the dynamic state. It is benefit for the traffic state analysis, vehicle route guidance and traveler information system.