Motorcycle Road Safety Audit Case Studies
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Summary
This report, sponsored by the Federal Highway Administration (FHWA), addresses the rising trend of motorcycle fatalities and injuries in the United States by examining how Road Safety Audits (RSAs) can be effectively utilized to improve motorcyclist safety. Despite motorcycles comprising only three percent of registered vehicles, they accounted for 15 percent of traffic fatalities in 2012. The study aims to help federal, state, tribal, and local agencies understand conditions affecting motorcyclists and identify opportunities for improvement through the RSA process, which is a formal safety performance evaluation conducted by independent, multidisciplinary teams. The methodology involved reviewing three specific RSA case studies conducted between 2012 and 2014 at locations with a demonstrated high frequency of motorcycle crashes. The selected sites included North Carolina Routes 28 and 143 in Graham County, three segments of Washington State Route 7, and a 60-mile segment of the Blue Ridge Parkway managed by the National Park Service. Each audit followed the standard eight-step RSA process, which includes project selection, team assembly, start-up meetings, field reviews, analysis, preliminary findings, reporting, and implementation. A key methodological feature was the inclusion of motorcyclists and motorcycle safety advocates in the RSA teams and discussions, ensuring that rider perspectives and experiences informed the analysis of geometric, operational, and human factors. The findings highlight several positive measures and challenges in incorporating motorcycle safety into RSAs. Collaboration with motorcycle safety clubs proved critical for identifying specific hazards. Implemented or recommended countermeasures included motorcyclist-specific signage, such as curve warnings with advisory speed plaques and supplemental motorcycle plaques. Other measures involved reducing posted speed limits in high-exposure zones, increasing speed enforcement, installing paved aprons at gravel driveways to reduce loose material, and launching targeted education campaigns like Washington’s “It’s a Fine Line” initiative. The report also notes that traditional roadway design often fails to explicitly consider motorcycle dynamics, and that human error remains a primary crash cause, though environmental factors like drainage and pavement conditions significantly impact motorcycle stability. The significance of this report lies in its demonstration that RSAs are an effective tool for proactively addressing motorcycle safety when multidisciplinary teams include rider expertise. It concludes that agencies should continue to engage motorcyclist stakeholders, evaluate licensure and training policies, and implement design standards that account for the unique vulnerabilities of motorcycles. By synthesizing lessons from these case studies, the report provides a framework for transportation agencies to reduce crash frequency and severity, ultimately contributing to broader efforts to lower the disproportionate rate of motorcycle fatalities.
Key finding
Integrating motorcyclist expertise and specialized safety checks into Road Safety Audits effectively identifies infrastructure deficiencies like drainage and signage that contribute to crash risks.
Methodology
other
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 4 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 42 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: crash risk outcomes