连续长大下坡路段交通事故特征分析

在对连续长大下坡路段交通事故数据和道路设计参数调查的基础上, 分析了连续长大下坡路段的交通安全状况, 讨论了急弯陡坡、连续陡坡和连续缓坡3种线形组合形式路段的交通事故特征和事故原因。结合典型长大下坡路段的交通事故数据, 运用数理统计与回归分析方法, 研究了交通事故与道路纵断面参数之间的关系。分析结果表明: 在连续长大下坡路段地点坡度为3%~4%时, 事故率最高; 事故率与事故发生地点前2 km以上路段平均坡度呈显著的指数关系, 所建立回归模型的判定系数高于0.84。

Analysis of traffic accident characteristic on continuous long downgrade section

Based on the investigation of traffic accident data and road design parameters of continuous long downgrade sections, the traffic safety situations of the sections were analyzed, and the traffic accident characteristics and reasons of sharp curve-steep downgrade section, continuous steep downgrade section and continuous gentle downgrade section were discussed.According to the relative data of typical sections, the relationship between traffic accidents and road vertical section parameters was studied based on statistics and regression methods.Analysis result indicates that the traffic accident rate is highest when the grade value of continuous long downgrade section is in the range of 3% to 4%.It has clear exponential relationship between the accident rate and average gradient of the section in front of more than 2 km at accident spot, and the determinant coefficient of regression model is more than 0.84.