隧道与互通式立交小间距路段标志视认性研究

Study on the Identification of Signs in Tunnel and Interchange with Small Spacing Section

本文针对隧道与互通式立交小间距路段事故频发,对隧道与互通净距较小路段的标志视认性进行分析研究。在分析“国标”文字高度模型的基础上,综合考虑车辆运行速度、标志信息量、驾驶员出隧道后的明暗适应等多种因素,分析出隧道后驾驶员交通标志的视认性,并分别从汉字高度、视认距离两方面进行综合分析,提出基于运行速度、标志信息量、明适应条件下的汉字高度及视认距离的计算模型,并给出不同因素条件下汉字高度、视认距离的最小计算值。最后依托工程项目实例,采用该计算模型对隧道出口与互通式立交出口小间距路段出口预告标志的视认性进行分析,并提出加强标志视认性的优化设计方案。

Aiming at the frequent accidents in the sections with small spacing between tunnels and interchanges,the visibility of signs in sections with small clearance between tunnels and interchanges is analyzed and studied.On the basis of analyzing the"national standard"text height model,comprehensively considering various factors such as vehicle running speed,sign information,and driver's adaptation after exiting the tunnel,the visual recognition of the driver's traffic sign after the tunnel is analyzed,and the comprehensive analysis is carried out from the aspects of Chinese character height and visual distance,and a calculation model based on running speed,sign information,Chinese character height and visual distance under the condition of clear adaptation is proposed,and the minimum calculation value of Chinese character height and visual distance under different factors is given.Finally,based on the project example,the calculation model is used to analyze the visual recognition of the exit warning signs of the small-pitched road section of tunnel exit and interchange exit,and an optimization design scheme to strengthen the visibility of the sign is proposed.