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降雨对高速公路交通流会产生一定的影响。为量化分析不同强度降雨对高速公路交通流微观和宏观特性的影响程度,根据实际观测的高速公路交通流和降雨量数据,确定了各种降雨类型下微观交通流特性参数(如速度、车头时距、车头间距等)的分布规律;对经典的宏观交通流模型进行了对比分析,选择Van Aerde模型作为雨天环境下高速公路交通流模型,运用启发式算法对各种类型降雨下的模型参数进行了标定,并给出了不同天气下交通流量-速度关系曲线和速度-密度关系曲线。结果表明,与无雨天气相比,小雨、中雨和大雨天气下高速公路平均速度分别下降4.7%、9.8%和16.1%,通行能力分别降低10.5%、17.4%和27.1%。
Rainfall has a certain impact on expressway traffic flow. In order to quantitatively analyze the influence of rainfall with different intensities on the microcosmic and macroscopic characteristics of expressway traffic flow, the traffic flow and rainfall data of expressway were used to determine the microscopic traffic flow characteristics (such as speed, The distance between the front and the front of the highway, etc.). The classical macro traffic flow model is compared and analyzed. The Van Aerde model is selected as the expressway traffic flow model in rainy days. The heuristic algorithm is used to analyze the model parameters of various types of rainfall The calibration and the curves of traffic flow rate versus speed and density under different weather conditions are given. The results show that the average speed of expressways decreased by 4.7%, 9.8% and 16.1%, respectively, with the decrease of 10.5%, 17.4% and 27.1% respectively in the light rain, moderate rain and heavy rain.