山区高速公路几何线形与事故率关系研究

利用山区高速公路几何线形与交通事故数据,对平、纵及其线形组合与事故率的关系开展研究,建立了直线段长度、平曲线半径、平曲线偏角、纵坡坡度、竖曲线半径等单一线形指标与事故率的量化关系,在此基础上分析了直线接平曲线路段、纵坡和平曲线组合路段、平曲线与竖曲线组合路段、断背曲线路段、凹凸竖曲线组合路段的事故率,最后对多重线形组合路段的事故率进行了对比分析。研究成果对提高山区高速公路的交通安全水平以及基于交通安全需求优化几何线形设计成果等具有一定的借鉴意义。

Research on Relationship Between Traffic Accident Rate and Geometric Alignment for Mountainous Freeway

Based on the data of geometric alignment and traffic accidents which are obtained from mountainous freeway,the relationships between accident rate and geometric alignment are analyzed.Firstly,the accident rate related to each of the specific alignment indexes such as the length of tangent,radius of horizontal curve,external angle of deflection,longitudinal gradient and radius of vertical curve are determined.Then,the accidents occurred on highway segments of tangent followed by horizontal curve,longitudinal gradient versus horizontal curve,horizontal curve versus vertical curve,broken-back curve,and multi-vertical curves are discussed.Furthermore,the accident rates on complex highway segments having more than two alignment conditions are summarized.The research results will be helpful to improve the safety situation of mountainous freeway,and can also be applied for optimizing the highway geometric design.