United States Department of Transportation
i
Guardrail and bridge rail recommendations for very low-volume local roads in Kansas.
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2014-12-01
[PDF-2.42 MB]
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Abstract:The determination of warrants for bridge railing and approach guardrails is a fundamental roadside safety issue. These are
specialized roadside safety barriers that are intended to capture and smoothly redirect errant vehicles that leave the roadway either
on the bridge itself or on the approach to the bridge.
The Federal Highway Administration (FHWA) requires tested bridge rails and approach guardrails on all National Highway
System (NHS) Roadways. However, states are given the discretion to develop their own policies for non-NHS roads. Currently in
Kansas, all bridges constructed with federal funds are required to have one of the Kansas Department of Transportation’s (KDOT)
standard bridge rails (either corral rail or barrier curb) and approach guardrail (including transition and end treatment). These
systems are expensive in terms of the initial cost of a bridge and they have additional safety and maintenance considerations that
may outweigh the expected safety benefits on many low-volume applications.
In an effort to maximize the safety benefits of the limited funding, KDOT undertook the effort outlined in this report to
establish practical risk-based guidelines and policies for bridge rails and guardrails on low-volume local roads
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