United States Department of Transportation
i
Guardrail Evaluation for Hazards on Low-Volume Rural Roadways in Kansas Using RSAP
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2022-01-01
[PDF-5.03 MB]
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Edition:August 2018–August 2020
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Abstract:This study utilized Roadside Analysis Program Version 3 (RSAPv3) simulation because it implements previous crash statistics and could be readily updated with local data. With the help of KDOT staff, the research team synthesized traffic operation data and geometric features on rural roads in Kansas and carried out crash simulations using RSAPv3 to determine if the benefits of guardrail implementation exceeded the corresponding costs. The results were intended to help local engineers decide whether to implement guardrails in roadside locations with hazards. Meanwhile, the simulation also revealed significant contributing factors to rural roadside crashes. Survey results and simulation outcomes showed similar patterns. Based on project results, the benefit-cost ratios did not justify the implementation of new guardrails for bare culverts or bare embankments on rural roads in Kansas. However, W-beam guardrails were efficiently implemented on bridges with medium-hazard-level edges without bridge-approach guardrail. Likewise, for bridges with TL-2 bridge rails, study results did not justify implementing bridge-approach guardrail.
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