视距对道路线形安全评价的重要性及方法

  

(西安公路研究院,陕西 西安  710065

  要:视距是导致交通事故的重要因素。在道路设计过程中,基于视距检验对道路线形进行安全评价,对降低事故率,提高行车安全有重要意义。我国道路安全评价方法以设计车速评价为主体,对视距检验的重视程度较低。本文介绍了视距对交通安全的影响,发现平曲线连续弯坡、纵断面凸坡、纵断面凹坡是最容易造成视距不足的路段类型。文章还总结了现阶段视距的主要测量方法及基于视距检验的道路线形安全评价方法。

关键词:安全评价;道路线形;测距方法;视距检验

中图分类号:U491    文献标识码:A

Safety Evaluation of Highway Alignment Based on Sight Distance

ZHANG  Fang

Xi’an Highway Research Institute,Xi’an 710065,China

AbstractThe sight distance of highway especially to the highway is one of the most important factors to ensure operation safety. At the recently status of road safety evaluation in China, the operation speed consistency evaluation is the main method; however, the importance of sight distance was underestimated. This paper introduces the influence of sight distance on traffic safety, found that the continuous horizontal curves, convex slope segment, concave slope segment is the most likely to cause the lack of sight distance. The collection methods of sight distance were summarized. The highway safety evaluation methods based on sight distance were summarized.

Key words: Safety evaluationHighway alignmentCollection MethodSight distance test