城市快速路匝道出口交织区交通冲突特性研究

为了研究城市快速路匝道出口及交织区的交通运行特性,以长春市具有代表性的快速路匝道出口作为调查对象,以调查实测的数据为基础建立模型,分析交通冲突特性、交通流流量特性及密度特性,建立研究路段交通冲突数与流量和交通密度的关系模型。研究结果表明,快速路出口处车流量的冲突数随着交通流量的增加而增加,而与交通密度的关系中则存在一个临界值(交通密度达到131辆/km,交通流变为强制流)。本文研究成果可以为城市快速路匝道出口控制提供理论依据与参考借鉴。

Research on traffic characteristics of interchange area at ramp exit of urban expressway

In order to study the traffic operation characteristics of urban expressway exit ramps and interweaving areas,a representative expressway exit in Changchun city is taken as the investigation object,and a model is established based on the survey data.The traffic conflict characteristics,traffic flow characteristics and density characteristics are analyzed,and the relationship model between traffic conflict number and traffic flow and density is established.The result shows that the number of traffic conflicts at the expressway exit increases with the increase of traffic flow,and there is a critical value in the relationship with traffic density(traffic density reaches 131 vehicles/km and traffic flow becomes forced flow).The result of this paper can provide theoretical basis and reference for urban expressway exit control.