快速路自由流速度及其影响因素

Factors influencing free flow speed on expressway

为了研究快速路自由流速度的规律,利用上海市快速路上埋设的检测线圈获取的交通数据,应用统计分析的方法,分析了快速路实测自由流速度、理论自由流速度和85位车速及其关系。重点研究了实测自由流速度,采用定量分析的方法分别建立了实测自由流速度与平曲线半径、进出口距离与交通饱和度之间的回归模型。在此基础上,建立了快速路自由流速度估算模型,从而使得在缺乏交通流数据的条件下,能够估算自由流速度,为进行快速路运营阶段的系统服务水平评价和通行能力分析提供了依据。

In order to research the pattern measured FFS, the theoretical FFS and th of the free flow e 85 percentile spe speed （FFS） on the expressway, the ed and their correlation were analyzed statistically using the traffic data acquired by the loop vehicle detectors buried in the expressway in Shanghai. The attention was focused on the measure FFS, and the regression models between it and the radics of the horizontal curve, between it and the distance to the inlet or from the exit ramp, and between it and the traffic saturation degree. On this basis, a model was presented to estimate the FFS on the expressway without the need of the field data, providing a base for evaluating the service level of the expressway operation system and estimating its traffic flow capacity.