An Impact of Safety Rest Area Closures on Fatigue-Related Highway Crashes in the Pacific Northwest
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Summary
This study investigates the impact of Safety Rest Area (SRA) closures on fatigue-related highway crashes in the Pacific Northwest, specifically in Washington and Idaho. Motivated by budgetary constraints that have led states to close SRAs despite their role in mitigating driver fatigue, the research aims to quantify whether these closures correlate with increased crash rates. The study addresses a gap in empirical evidence regarding the safety consequences of SRA shutdowns, providing data to inform policy decisions on facility maintenance and closure. The researchers analyzed five specific SRA closures: three in Washington (Bow Hill, Smokey Point, and Silver Lake on I-5) and two in Idaho (Snake Riverview on I-84 and Huetter on I-90). Data were collected from state transportation departments and media outlets, including crash records, Annual Average Daily Traffic (AADT), and highway mile posts. The analysis focused on highway segments within a 90-minute driving distance upstream and downstream of the closed facilities. Crash rates were calculated per month and normalized per 10,000 AADT for periods before, during, and after the closures. This design allowed for a comparative assessment of total crashes and fatigue-specific incidents across different geographic contexts and traffic volumes. The findings revealed inconsistent results across the studied locations. In Washington, the closure of the three I-5 SRAs resulted in an approximately 12% increase in overall crash rates per 10,000 AADT during the shutdown period; however, fatigue-related crash rates did not significantly increase. In Idaho, the Snake Riverview SRA closure correlated with a decrease in both total and fatigue-related crash rates during the shutdown. Conversely, the Huetter SRA closure on I-90 led to a notable increase in both overall crashes and fatigue-related crashes, with fatigue-specific rates more than doubling during the closure period. The authors suggest that the lack of significant fatigue-related increases in some locations may stem from underreporting or misclassification of fatigue as a crash cause. The study concludes that SRA closures can influence highway safety, particularly regarding fatigue-related incidents, though the effects vary by location. The results underscore the importance of SRAs in reducing driver weariness and highlight the need for further research into variables affecting crash trends. The findings provide evidence-based insights for policymakers to develop strategies for minimizing accidents caused by fatigue and to formulate regulations regarding SRA closures, potentially balancing budgetary savings against long-term safety costs.
Key finding
Safety rest area closures resulted in inconsistent changes to fatigue-related crash rates across five studied locations, with no significant increase in Washington or one Idaho site, but a marked increase at another Idaho site.
Methodology
field_study
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 | — | — | 2 | 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 | 3 | 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