城市干道交通流速度一流量关系模型研究

Research on Speed-Flow Relationship Model of the Urban Roadways

为研究适合我国城市干道交通流特点的速度与流量之间的关系,在建立Greenshields模型和Re-Greenshields模型的基础上,结合城市干道交通流为间断流的特点,采用分段建模法建立了G-LN模型。通过拟合判定系数R_(sq)对Greenshields模型和Re-Greenshields模型进行对比,并利用实测数据标准差S对Re-Greenshields模型和G-LN模型进行对比,结果表明:G-LN模型能更好地描述城市干道速度—流量关系。最后分析了模型参数,采用对分区间迭代法计算模型通行能力值。

Greenshields speed-flow model and Re-Greenshields speed-flow model are established to study the speed-flow relationship which suits Chinese urban roadways. With the discontinuous characteristics on the urban roadways, G-LN speed-flow model is established by using subsection modeling method. Greenshields model and Re-Greenshields model are compared by criterion Rsq, Re-Greenshields speed-flow model adn G-L_N speed-flow model are compared by criterion S. The result shows that G-LN speed-flow model can describe the relationship better. Finally the model parameter is analyzed and the value of capacity of each lane of G-LN speed-flow model is obtained by section iteration method.