基于高速公路线形综合指标的安全评价模型

Safety Evaluation Model Based on Alignment Synthetical Index of Expressway

摘要:

为全面地研究公路线形指标与道路安全的关系，以曲率、曲率变化率、曲线转角、纵坡度、车道宽度、车道数、左右路肩宽度等设计指标为依据在国内首次提出了公路线形综合指标的概念.在此基础上构建了公路线形综合指标评价模型，评价模型为公路线形的量化分析提供了理论评价方法.通过回归得到事故率与线形综合指标累计值的关系，回归结果证明公路线形综合指标可以作为公路线形质量评价和道路安全评价的评价指标，并且综合指标累计值与事故率具有较好的相关性，得到了事故率与综合指标累计值的关系模型.并根据算例制定了安全性评价标准.

Abstract:

In order to investigate comprehensively the relationship between alignment index and road safety,the research puts forward the concept of road alignment synthetical index based on design indices such as curvature and its changing rate,curve angle,lognitudinal gradient,lanewidth,lane number,and shoulder widths.Road alignment synthetical index evaluation model is also established which provides theory evaluation method for the quantitative analysis of highway alignment.The relationship is obtained between accident rate and alignment synthetical index accumulative total value through the regression analysis.The regressive results certify that the road alignment synthetical index can be chosen to evaluate the road alignment quality and road safety and better correlation exists between accumulative total value and accident rate while the correlative model between accident rate and synthetical index accumulative total value is established.Based on case studies,a safety evaluation standard is proposed.