线形诱导标设置条件的探讨

线形诱导标用于引导或警告驾驶员平面线形的变化,科学合理的设置线形诱导标有利于公路行车安全。在总结国内外研究成果和标准规范的基础上,针对国内外对线形诱导标设置条件的规定比较模糊,不便于实际操作的问题,对公路平曲线线形诱导标的设置条件进行了探讨,从视距和线形协调性两方面讨论了线形诱导标的设置条件。根据人机工程学并结合平曲线行车视距,讨论得出视距不良平曲线路段的界定条件;根据曲线路段运行速度的连续性和运行速度理论,讨论得出急弯曲线路段的界定条件。同时根据道路设计理论和运行速度预测模型推导出便于实际计算的应设置线形诱导标的急弯和视距不良路段的判定方程,为后续线形诱导标的相关研究和实际工作提供了借鉴。

Discussion on Chevron Alignment Sign Placing

Chevron alignment signs which are placed on curve sections are useful for guiding and warning drivers to pay more attention to the alignment change.Reasonable placed chevron alignment signs are advantageous to driving safety.On the basis of analyzing and sum- marizing the existing literature and research outcomes on the chevron alignment sign study,aiming at correlative specifications in the do- mestic and foreign,which stipulations about placement of chevron alignment signs are not very clear and practical and difficult to use in the actual project,the alignment condition of horizontal curves and placement rule of chevron ahgnment signs are discussed,and the placing rule of the chevron alignment sign on aspects of sight distance and the alignment consistency is proposed.According to the driv- ers' vision field of man-machine engineering and sight distance of horizontal curves,the estimation rule of the poor sight distance curve section of highways is discussed and proposed.The estimation rule of sharp curve section are discussed and proposed as well according to the theory of operating speed and its continuity.The correlative formula of the poor sight distance curve section and sharp curve section judgment are derived,which provides reference for the following correlation research and practical work.