城市路段转向换道流量的理论计算方法

为解析城市路段的复杂换道特征，从城市路段多向输入、多向输出、短距离等典型特征入手，分析由于交通规则和路由选择引起的确定性城市路段转向换道行为。通过对城市路段典型渠化方式的理论建模，建立城市路段转向换道流量及转向换道率的理论计算方法。计算分析多向输入和多向输出对城市路段转向换道流量的影响。结果表明：在路段入口输入流量不变的情况下，随着路段出口左转和右转流量比例增加、直行比例减少，路段转向换道流量呈现先增大后减小趋势；随着出口左转和右转车道数增加、直行车道数减少，转向换道流量也呈现先增大后减小趋势。

Theoretical calculation method of urban road turning lane-flows

To analyze the complex change road features of city section ,based on the aspects of typical characteristics such as urban road multi input , multi output , short distance , this paper presents the deterministic urban road change behavior under traffic rules and the routing selection . The city road steering flow and steering lane change rate calculation method is established under the theoretical modeling of urban sections of typical channelization methods . Then it analyzes the multiple input and multiple output section of the city turn to lane‐flows through calculation .The result shows that with the increase of the proportion of left turn and right turn flow ,and the decrease of the proportion of the straight flow ,the city road steering flow increases first and then decreases w hile the input flow rate of the urban road section is constant ;with the increasing number of outlet sections left turn and right turn lane and the reduce of straight lane number ,the city road steering flow also increases first and then decreases .