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以山区高速公路平曲线路段为研究对象,对建议限速标志的设置方法和流程进行研究。采集了8条山区高速公路的平曲线运行速度数据并进行分析,提出以小车运行速度差作为判定准则确定是否设置建议限速标志。选择平曲线半径和入曲线前运行速度为自变量,建立线性模型预测小车运行速度差,并通过将运行速度和设计速度综合确定建议限速值,最后分析驾驶员的视认特性,计算出不同运行速度下对应的建议限速标志前置距离。结果表明:当平曲线半径小于300m的时候,在高速公路平曲线上应设置建议限速标志。
Taking the flat curved section of mountain highway as the research object, the method and process of setting the recommended speed limit sign are studied. This paper collected and analyzed the flat curve running speed data of eight mountainous expressways, and proposed to determine whether to set the recommended speed limit flag by using the difference of running speed of trolley as the judgment criterion. Choose the radius of the curve and the run-in speed before the curve as the independent variables to establish a linear model to predict the difference between the running speed of the car and the running speed and the design speed to determine the recommended speed limit, and finally analyze the driver’s visual recognition characteristics to calculate the difference The corresponding recommended speed limit mark distance at running speed. The results show that when the curve radius is less than 300m, the recommended speed limit should be set on the flat curve of the expressway.