周家嘴路车流起动波速统计研究

通过实际观测和统计分析 ,论证了平面交叉口红灯转绿灯时车流起动波速可以满足正态分布假设 ,更可以满足泊松分布假设 ,后者拟合优度高于前者。揭示了在周家嘴路条件下 ,随着车辆排队长度增加 ,起动波速会相应变大 ,呈负指数规律上升的趋势 ,与低速混合路段有明显差异。据此建议 ,如将交通流动力学模型应用于高速公路或城市高架道路一类问题时 ,状态指数取值在 2 .5左右为好。

Statistics analysis on vehicle flow starting wave speed of Zhoujiazui road

In this paper,it is proved that the vehicle flow starting wave speed distribution in green light period at a plane intersection satisfies Poisson assumption as well as a normal assumption by actual observations and statistics analysis,and the Poisson assumption is better agreement with the observation data.It is also shown that with the increase of the vehicle flow queue length the starting wave speed will increase as a negative exponent function under the condition of Zhoujiazui road,which is obviously different from the roads in which vehicles run at low speed and together with bicycles.According to these results,it is proposed that the traffic behavior parameter in the traffic fluid dynamics model may be value about 2 5 in case of modeling of the expressway traffic procedures.