基于路段与节点的城市道路阻抗函数改进

Improvement of Urban Road Impedance Function Based on Section Impedance and Node Impedance

道路阻抗是车辆在城市交通网络中运行通达程度的度量值,是路径选择的基础。将城市交通道路阻抗分为路段阻抗与节点阻抗两部分,路段阻抗利用交通量与交通密度间的相互关系优化BPR函数得到,节点阻抗根据交叉口道路饱和度不同选用不同模型得到。同时,利用道路阻抗影响因子改进该道路阻抗模型,使其更精确。最后利用南京市龙蟠中路道路的实测数据对改进的城市道路阻抗函数进行了验证。结果表明:改进的城市道路阻抗函数能够较好的反映实际道路阻抗。

Road impedance is used to measure the accessibility of vehicles in urban traffic network, and is the basis of vehicle routing selection. The urban road impedance was divided into two parts： section impedance and node impedance.Section impedance was obtained by the optimization result of BPR function based on the relationship between traffic volume and traffic density; node impedance was obtained by adopting different models according to different road saturation at intersections. At the same time, the road impedance model was optimized by integrating into the influence factors of road impedance to make it more accurate.Finally,the improved road impedance function was verified by using the measured data of Nanjing Longpan road. The result shows that the optimized urban road impedance function can reflect the actual road impedance better.