Washington: Highway Safety Improvement Program 2021 Annual Report
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Summary
This document is the 2021 Annual Report for the Washington State Highway Safety Improvement Program (HSIP), submitted by the Washington State Department of Transportation (WSDOT) to the Federal Highway Administration. The report addresses the federal mandate for states to report on progress toward reducing fatalities and serious injuries on public roads. It was motivated by a concerning trend in 2020 where crash fatalities and serious injuries increased, particularly on county and city roads, driven by factors such as speeding, extreme speeding events, and driving under the influence of drugs or alcohol. While state highway fatalities decreased compared to 2019, the overall percentage of crashes resulting in fatal or serious injury rose, prompting WSDOT to maintain aspirational safety targets and develop an implementation plan to advance its "Target Zero" strategy toward a Safe System approach. The methodology described in the report outlines a centralized, data-driven program structure. WSDOT allocates 70% of HSIP funds to local roads (county and city) and 30% to state highways, based on the ratio of fatal and serious injury crashes in priority emphasis areas: lane departure and intersection crashes. Local agencies must submit a Local Road Safety Plan to be eligible for funding. The program utilizes both crash reduction (spot locations) and prevention (systemic) approaches. Project identification relies on network screening, crash frequency analysis, and excess expected crash frequency models adjusted for empirical Bayes methods. Prioritization is primarily determined by benefit/cost analysis, with specific programs like the City Safety Program also considering cost-effectiveness and available funding. The report details methodologies for various sub-programs, including horizontal curves, median barriers, roadway departures, and active transportation safety, which incorporates equity metrics such as low-income household concentration and disability prevalence. The findings highlight the administrative and procedural status of the HSIP rather than specific quantitative safety outcomes for 2021, as the text provided covers the program structure and methodology sections. Key findings include the identification of speeding and impaired driving as primary contributors to the 2020 crash increase. The report confirms that WSDOT continues to coordinate with external partners, including the Washington Traffic Safety Commission (WTSC), Metropolitan Planning Organizations (MPOs), and federal agencies, to set safety targets and develop legislative proposals. The program structure emphasizes a shift toward systemic and proactive safety measures, with tribal roads included in county or city project lists due to insufficient standalone crash data for a separate funding call. The significance of this report lies in its documentation of Washington’s compliance with federal HSIP requirements and its strategic response to worsening safety trends. By formalizing the allocation of resources based on crash data and emphasizing systemic improvements, WSDOT aims to achieve its 2030 safety targets. The integration of equity considerations into active transportation safety projects and the requirement for local safety plans represent a move toward a more comprehensive and inclusive safety framework. The report underscores the importance of inter-agency collaboration and data-driven decision-making in addressing the complex factors contributing to highway fatalities and serious injuries.
Key finding
The 2021 report documents a decrease in state highway fatalities but a significant increase in fatalities and serious injuries on county and city roads, driven by speeding and impaired driving.
Methodology
dataset
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
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| extract | success | cached | — | — | 2 | 2026-06-10 |
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| enrich | success | — | — | — | 1 | 2026-05-23 |
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| 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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- Applied Guidance: countermeasure evaluation
- Empirical Findings: crash risk outcomes
- Methodological Resource: dataset resource