Mississippi: Highway Safety Improvement Program 2021 Annual Report
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Summary
This document is the 2021 Annual Report for the Mississippi Highway Safety Improvement Program (HSIP), administered by the Mississippi Department of Transportation (MDOT). The report addresses the federal mandate to reduce fatalities and serious injuries on public roads by detailing the state’s program structure, methodology, project implementation, and safety performance for Federal Fiscal Year 2021. The primary motivation is to align HSIP activities with Mississippi’s Strategic Highway Safety Plan (SHSP) and to demonstrate compliance with Federal Highway Administration (FHWA) reporting requirements. The HSIP methodology relies on a data-driven approach using crash frequency, crash rates, and excess proportions of specific crash types to identify high-risk locations. Project prioritization is determined by benefit-to-cost analysis, available funding, and cost-effectiveness. MDOT employs a collaborative selection process involving a Safety Countermeasure Selection Team, which includes various internal divisions and district personnel, to vet countermeasures through site visits and formal reviews. The program emphasizes systemic safety improvements, such as rumble strips, cable barriers, and shoulder widening, alongside spot treatments like modern roundabouts and restricted crossing U-turns. Local roads are addressed through the Circuit Rider Program, which provides technical assistance and low-cost countermeasures to local authorities. In FFY 2021, MDOT programmed and obligated $29,497,582 in HSIP funds, along with $5,794,794 in penalty funds and $3,921,375 in state and local funds, totaling $39,213,751. The report lists numerous specific projects, including the installation of modern roundabouts, intersection geometry improvements, and systemic shoulder widenings. Notably, 5% of HSIP funds addressed systemic improvements, while 1% was allocated to local road projects. The state also invested in non-infrastructure projects, such as data analysis systems, accounting for 4% of funding. MDOT reported no impediments to obligating funds and noted a continued focus on pairing HSIP dollars with state-funded overlay projects to maximize efficiency. The significance of the report lies in its demonstration of MDOT’s commitment to a "culture of safety" and the effective use of proven safety countermeasures. The state highlights advancements in systemic safety, particularly targeting lane departure crashes through clear zone improvements and edge line delineation. While the report notes a disparity between funds programmed for local roads and the percentage of fatal and serious injury crashes on those roads, it outlines plans to address this gap in future years. The document serves as a comprehensive record of Mississippi’s efforts to enhance roadway safety through rigorous data analysis, collaborative planning, and targeted infrastructure investments.
Key finding
The Mississippi Highway Safety Improvement Program utilized a combination of systemic improvements, proven countermeasures, and strategic fund pairing to program and obligate over $39 million in safety funds during the reporting period.
Methodology
dataset
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
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| discover | success | rosap | — | — | 2 | 2026-05-23 |
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| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
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| 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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- Applied Guidance: countermeasure evaluation
- Empirical Findings: crash risk outcomes
- Methodological Resource: dataset resource