Guidelines for Guardrail Implementation
Transportation Research Board, Jan 1, 2009 - Roads - 30 pages
This report provides guidance on selecting the appropriate barrier performance level for the installation of longitudinal barriers. The report presents performance-level selection guidelines to help designers determine the most appropriate guardrail test level for any route. Further, site-specific guidelines not only identify what guardrail test level should be incorporated but also can be used to determine when guardrail use is not cost beneficial. Supplemental procedures for identifying appropriate guardrail test levels have also been developed. These procedures expand the applicability of the guardrail selection guidelines to many unusual hazards that cannot be included in development of general procedures. The report will be of particular interest to designers with responsibility for designing roadside safety features.
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AASHTO appropriate guardrail test associated average crash cost B/C ratio barrier test level beneﬁt-to-cost analysis beneﬁts Cooper cost beneﬁcial crash data crash frequencies curvature development of guardrail encroachment frequency encroachment probability models Engineering estimated evaluation Federal Highway Administration Federal Railroad Administration FHWA ﬁndings ﬁve ﬂat freeways grade guardrail application guardrail selection guidelines guardrail test level guardrail use guidelines guidelines for guardrail hazard envelope hazard offset highway agency highway functional class Hutchinson and Kennedy identiﬁed identify lateral extent ment moderately severe National Academy NCHRP parameters point hazards procedures ran-off-road crashes roadside hazards Roadside Safety roadside slopes Roadway and roadside RSAP analysis RSAP runs Rural Arterial Rural Collector/Local safety improvements safety treatment severe hazard severe slope shown in Table signiﬁcantly site-speciﬁc speciﬁc sufﬁcient terrain Texas Transportation Institute tion TL-5 barriers trafﬁc characteristics trafﬁc volume Transportation Research Board travelway U.S.DOT Urban Arterial Washington Wide Any Narrow y-intercept