United States Department of Transportation
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Development of Approach Transition From Box Beam Guardrail to Concrete Parapet
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2023-12-01
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[PDF-31.86 MB]
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Alternative Title:Pooled Fund for the Development of Approach Guardrail Transitions for Box Beam and MGS (Wyoming, Montana) [Project Title from Cover]
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Edition:April 2022 – December 2023
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Abstract:This research is a step in the Wyoming Department of Transportation’s ongoing efforts to implement the Manual for Assessing Safety Hardware (MASH) to enhance roadside safety and reduce the severity of run-off-road crashes. The objective of this research was to develop a MASH Test Level 3 (TL-3) compliant stiffness transition from box beam roadside guardrail to concrete parapet or bridge rail. Shape transitions were developed to transition the vertical concrete profile to which the box beam transition is attached to a New Jersey or single slope profile. The Concrete Parapet Shape Transition and box beam transition to concrete parapet met the performance criteria for MASH TL-3 transitions. Both transition systems are considered MASH compliant. This report provides details on the development of the Concrete Parapet Shape Transition and box beam approach transition, the crash tests and results, and the performance assessment of the transitions for MASH TL-3 evaluation criteria.
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