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原文传递 Statewide Analysis of Guardrails, Curves and Crashes

题名：	Statewide Analysis of Guardrails, Curves and Crashes
作者：	Lee, B. H. Y.; Aizpuru, P. R.; Neely, S.
关键词：	Transportation access##Vermont Agency of Transportation (VTrans)##Guardrails##Curves and turns##Crashes##Statistical models##Crash incident##Vertical curves##Vermont Agency of Transportation (VAOT)##
摘要：	The presence of guardrails and the locations of horizontal and vertical curves, all with respect to crash incidents, are important road safety topics that have been examined separately. Since guardrails and curves, horizontal ones in particular, are often co-located (i.e., many guardrails are placed along curves and many curves have guardrails), it is highly likely that these road features are correlated in space and confound each other’s relationship with crashes. Both guardrails and curves may vary in their attributes by location (e.g., guardrails in coverage, size, offset; curves in radii, grades, length) and may relate to crashes in positive and negative ways. Statistical models of crash incidents with a focus on one of these features will, therefore, need to account for the others, while also controlling for many of the same relevant factors (e.g., seasons, times of day, traffic volumes, and other road characteristics). As such, guardrails and curves are examined together with crashes in this statewide study using a single, holistic approach. The primary goals of this work is to assess the impacts of guardrails, and horizontal and vertical curves on crash incident outcomes in the state of Vermont and to help guide the Vermont Agency of Transportation (VAOT).
总页数：	50
报告类型：	科技报告