Examining the effect of speed, roadside features, and roadway geometry on crash experience along a rural corridor
Examining the effect of speed, roadside features, and roadway geometry on crash experience along a rural corridor
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检查速度、路边特征和道路几何形状对乡村走廊沿线碰撞体验的影响
DOI：
10.1007/s40534-014-0040-4
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发表时间：
2014
影响因子：
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通讯作者：
N. D. Anderson
中科院分区：
文献类型：
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作者：
Donald C. Watson;A. Al;N. D. Anderson
本文介绍了目前对蒙大拿州西南部一条15.7英里农村走廊沿线的撞车经历的调查，目的是更好地了解该走廊沿线的撞车原因。这项研究利用了十年的碰撞数据、几何数据和沿走廊观测的自由流动速度数据。使用了一种系统的方法，每十分之一英里根据撞车经验、速度、路线和路边特征进行描述。使用双变量和多变量统计分析，该研究调查了走廊沿线的撞车经历以及一些可能解释一些撞车原因的潜在关系。结果表明，撞车率和水平曲率之间存在很强的相关性，即使是根据公路设计公式，可以在高于张贴限速的速度下通过的平曲线也是如此。更高的撞击率也被发现与观测到的自由流动速度和根据设计方程由曲线半径或视距决定的速度之间的差异有关。此外，结果有力地支持护栏的安全益处，较低的撞击率和严重程度证明了这一点。研究还发现，固定物体的存在和斜坡的陡峭程度也会影响撞车率和严重程度。
This paper presents a current investigation into crash experience along a 15.7-mile rural corridor in southwest Montana with the aim of better understanding crash causal factors along the corridor. The study utilized ten years of crash data, geometric data, and observed free-flow speed data along the corridor. A systematic approach was used where every tenth of a mile was described in term of the crash experience, speed, alignment, and roadside features. Using bivariate and multivariate statistical analyses, the study investigated the crash experience along the corridor as well as some of the underlying relationships which could explain some of the crash causal factors. Results show a strong association between crash rates and horizontal curvatures even for flat curves that can be negotiated at speeds above the posted speed limit, per the highway design equations. Higher crash rates were also found to be associated with the difference between the observed free-flow speeds and the speed dictated by the curve radius or sight distance as per the design equations. Further, results strongly support the safety benefits of guardrails as evidenced by the lower crash rates and severities. The presence of fixed objects and the steepness of side slopes were also found to have an effect on crash rates and severities.