【作者】 朱晓波； 杨晓光；

【Author】 Zhu Xiaobo;Yang Xiaoguang;

【机构】 上海同济大学道路与交通工程教育部重点实验室；

【摘要】 提出了基于等时线的突发事件下城市路网交通流演化分析方法,通过分析行程时间在路网上的空间分布特征,将以往微观交通流分析上升到路网级的宏观角度。在总结等时线定义、基本参数的基础上,定义了四个等时线分析指标以定量地分析突发事件发生后路网交通流演化特征,并提出了分析流程。通过交通仿真实验对该方法的实用性和有效性进行检验。结果表明,该方法定性与定量相结合地分析突发事件下路网交通流演化过程,等时线图直观地反映了突发事件对路网交通流的影响,可以快速、准确地判断事件发生方向与位置,指标则定量地分析交通流变化特征和程度、出行者绕行方向和趋势等。该方法可以为突发事件识别、城市交通管控提供科学依据和决策支持。更多还原

【Abstract】 To analyze the evolution of network traffic flow under traffic emergency conditions from a macroscopic perspective, this paper proposes an approach based on traffic isochrones map which represents spatial distribution of travel time in an urban road network. Based on introductions to definition and essential parameters of traffic isochrones map, four indexes are proposed to quantitatively analyze characteristics and evolution of network traffic flow under traffic emergency conditions and thereupon an analysis process is presented. Simulations are used to analyze the performance of the proposed approach. Results demonstrate that this traffic isochrones map based approach analyzes the evolution of network traffic flow under emergency conditions from both qualitative and quantitative aspects. The effects of traffic incidents on network flow are shown qualitatively and the locations of incidents are found quickly based on the changes in the traffic isochrones map, while the change degree and characteristics of network traffic flow are analyzed quantitatively using proposed travel time related indexes. In summary, the proposed approach provides a macroscopic view for the evolution of network traffic flow under traffic emergency conditions and is significant to emergency response and urban traffic management and control.更多还原