S-HAL : safety handbook for locals.
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Summary
The Safety Handbook for Locals (S-HAL), 4th Edition, is a comprehensive traffic safety resource produced by the University of Missouri for the Missouri Department of Transportation. It addresses the need for local communities, ranging from large urban centers to small rural counties, to adopt a systematic, data-driven approach to highway safety. The handbook was motivated by the release of the national Highway Safety Manual (HSM) and aims to translate its complex methodologies into accessible tools for local agencies with limited staffing and resources. A primary goal is to shift local safety practices from reactive "blackspot" identification—focusing solely on high-crash locations—to proactive, system-wide safety management that accounts for the inherent randomness of crash data and regression-to-the-mean effects. The S-HAL outlines a structured safety management process organized into seven chapters. It begins by guiding agencies in establishing robust traffic records systems, detailing the use of crash data interfaces, spreadsheets, and GIS databases. It then introduces network screening techniques using various safety performance measures, such as crash frequency, crash rate, Equivalent Property Damage Only (EPDO), and Relative Severity Index (RSI). The handbook provides detailed instructions on utilizing specific analysis tools, including collision diagrams, on-site observation reports, and advanced software like the Interactive Highway Safety Design Model (IHSDM) and SafetyAnalyst. Furthermore, it covers the selection and economic evaluation of safety countermeasures, offering examples for calculating net present value and benefit/cost ratios for improvements like traffic signals and lane width adjustments. Key findings and methodologies presented include the distinction between nominal safety (compliance with design standards) and substantive safety (actual reduction in crash frequency and severity). The text emphasizes that historical crash data alone is insufficient for prediction due to statistical bias; therefore, it promotes the use of predictive methods and Crash Modification Factors (CMFs) derived from the HSM to estimate expected crashes. The handbook also introduces Road Safety Audits (RSAs) as a critical tool, outlining an eight-step process for conducting field reviews and incorporating multidisciplinary perspectives. It highlights the importance of partnership-based approaches, involving law enforcement, education, and emergency medical services, rather than relying solely on engineering solutions. The significance of the S-HAL lies in its role as a gateway to the HSM for local practitioners, enabling them to implement sustainable, evidence-based safety plans. By providing standardized procedures for data collection, analysis, and countermeasure selection, the handbook helps local agencies prioritize projects effectively and justify expenditures through rigorous economic analysis. It supports the evolution of local transportation safety from subjective, reactive measures to objective, proactive strategies, ultimately aiming to reduce crash frequency and severity across Missouri’s diverse transportation networks.
Key finding
The S-HAL manual serves as a practical guide for local agencies to implement systematic, data-driven safety management processes that mirror the national Highway Safety Manual.
Methodology
review
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 | 42 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | partial | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified_with_issues.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- incidence prevalence
- comparative international
- regulatory evaluation
- naturalistic crash near crash
- roadway lighting effects
- crash typology
Information type
What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).
- Applied Guidance: countermeasure evaluation
- Empirical Findings: crash risk outcomes
- Methodological Resource: dataset resource