Missouri: Highway Safety Improvement Program 2021 Annual Report
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Summary
This document is the 2021 Annual Report for Missouri’s Highway Safety Improvement Program (HSIP), submitted to the Federal Highway Administration. The report addresses the state’s efforts to reduce fatalities and serious injuries on public roads, guided by the Strategic Highway Safety Plan (SHSP) titled "Show-Me ZERO," which aims for zero fatalities by 2030. The program is motivated by a significant rise in traffic fatalities, with 987 deaths recorded in 2020—the highest number since 2007—partially attributed to the COVID-19 pandemic and a 22% increase in crashes involving aggressive driving. The HSIP is administered by the Missouri Department of Transportation (MoDOT), with funds distributed to seven districts based on a three-year average of fatalities and serious injuries. The methodology relies on evidence-based decision-making, utilizing crash data from the Statewide Traffic Accident Records System (STARS) to identify high-risk locations. Projects are prioritized using systemic evaluations and severity indices, with 48% of HSIP funds dedicated to systemic improvements such as high-friction surface treatments, median barriers, and rumble strips. MoDOT employs the Highway Safety Manual (HSM) to calculate anticipated safety benefits for all HSIP-funded projects, ensuring rigorous justification for funding allocation. The program covers various safety categories, including horizontal curves, intersections, pedestrian safety, and roadway departures, while also incorporating Intelligent Transportation Systems (ITS) and connected vehicle technologies. In terms of implementation, MoDOT programmed $64.67 million in funds for the reporting period, with $79.82 million obligated, exceeding programmed amounts due to additional retroreflectivity and guardrail upgrade costs not initially estimated. Funding sources include federal HSIP allocations, penalty funds from traffic violations, and state/local contributions. Only 2% of funds were allocated to non-infrastructure projects, specifically for work zone enforcement. The report details specific project outputs, such as pavement surface improvements and rumble strip installations, noting that local road projects are included in the analysis but received 0% of direct HSIP funding obligations in this period. The significance of the report lies in its demonstration of how systemic initiatives and targeted spot treatments helped mitigate the overall increase in severe crashes despite rising fatality numbers. MoDOT emphasizes collaboration with external partners, including local governments and law enforcement, and internal divisions to ensure safety is integrated into all transportation projects. The report highlights ongoing challenges, such as balancing new safety improvements with asset management goals, and outlines plans to integrate HSIP projects into broader asset management processes to ensure long-term maintenance. Overall, the document serves as a comprehensive account of Missouri’s data-driven approach to highway safety, aligning federal requirements with state-specific strategies to enhance roadway safety.
Key finding
The report details the administrative structure, funding allocation, and project implementation of the Missouri Highway Safety Improvement Program for 2021, highlighting a 987-fatality year and the deployment of data-driven safety strategies.
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