Evidence From the Decade of Action for Road Safety: A Systematic Review of the Effectiveness of Interventions in Low and Middle-Income Countries
DOI: 10.3389/phrs.2022.1604499
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Summary
This systematic review evaluates the effectiveness of road safety interventions in low- and middle-income countries (LMICs) during the United Nations’ Decade of Action for Road Safety (2011–2020). The study was motivated by the disproportionate burden of road traffic injuries in LMICs, which account for over 90% of global road traffic deaths despite having only 60% of the world’s motor vehicles. Traditional approaches often failed to capture the complexity of road transport systems, prompting the authors to assess interventions through the lens of systems theory and the five pillars of the UN Global Plan: road safety management, safer roads, safer vehicles, safer road users, and improved post-crash response. The authors conducted a systematic review following PRISMA guidelines, searching nine electronic databases for original research published between 2011 and 2019. They included studies evaluating quantitative effects of road safety interventions on mortality, injury, or crash outcomes in LMICs. After screening 22,534 records, 33 studies from 17 countries were included. The authors assessed the risk of bias using the Effective Public Health Practice Project (EPHPP) tool, finding that 18 studies were rated as strong. Due to variability in statistical tests and outcomes, data synthesis was performed using vote counting based on the direction of effect, visualized via a harvest plot. Interventions were classified into seven categories adapted from the WHO Save LIVES technical package. The results indicate that legislation and enforcement interventions had the largest body of evidence and appeared most impactful. Of the 33 included studies, 18 focused on legislation and enforcement, five on leadership, and four on speed management. Interventions related to road infrastructure, vehicle safety standards, and post-crash response were significantly understudied. Within the legislation category, lowering blood alcohol concentration (BAC) limits and multifaceted road safety laws showed positive effects in several contexts, such as Brazil’s “Dry Law” and laws in China and Mexico, though results varied by location and enforcement strength. Speed management interventions, including traffic calming and camera enforcement, also demonstrated effectiveness in reducing crashes. However, the review highlighted a lack of comprehensive evidence for other critical components of the road safety system. The authors conclude that while legislation and enforcement are currently the most impactful interventions in LMICs, many other components of the road safety system remain understudied. The findings suggest a need for more holistic approaches that capture the complexity of road transport systems and evaluate interactions among different intervention categories. This review provides evidence to guide policy-makers in LMICs, emphasizing the importance of robust legal frameworks while calling for further research into infrastructure, vehicle safety, and post-crash care to address the high burden of road traffic injuries in these settings.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | DOAJ | — | — | 1 | 2026-06-25 |
| archive | success | unpaywall | — | — | 1 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-25 |
| chunk | success | chunk | — | — | 1 | 2026-06-25 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-25 |
| promote | success | — | — | — | 1 | 2026-06-25 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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- Applied Guidance: countermeasure evaluation