Traffic Calming Measures in Urban Environment: A Systematic Review
DOI: 10.3390/infrastructures11050148
archive: archived pipeline: cataloged verified
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Summary
This systematic review evaluates the effectiveness of traffic calming measures (TCMs) in reducing vehicle speeds and improving safety outcomes on urban and secondary roads. Motivated by the persistent global burden of road traffic injuries and the nonlinear relationship between speed and injury severity, the study addresses the fragmented evidence base surrounding diverse TCM interventions. The authors aim to synthesize findings across physical, regulatory, perceptual, and technological approaches to support informed decision-making for practitioners. The study follows PRISMA 2020 guidelines, analyzing peer-reviewed literature published between January 2020 and February 2026 from Scopus, ScienceDirect, and SpringerLink. After screening 726 records, 91 studies were included. The review employs a three-cluster taxonomy: physical and geometrical measures, regulatory and perceptual interventions, and digital and technological approaches. It integrates evidence from real-world field studies, naturalistic driving studies, driving simulator experiments, and computational simulations. Effects were categorized across six domains: speed reduction, crash and injury reduction, congestion and environmental effects, operational challenges, user acceptance, and unintended consequences. Due to heterogeneity in study designs, a qualitative narrative synthesis was conducted rather than a quantitative meta-analysis. The findings indicate that physically self-enforcing measures, particularly vertical deflection devices like speed humps and tables, yield the most consistent and robust reductions in operating speed and crash severity. For instance, round-top speed humps were associated with average speed reductions of approximately 46%, while speed tables can halve average speeds. Horizontal deflection measures, such as chicanes and roundabouts, also demonstrated significant effectiveness, with chicanes reducing speeds by up to 50% and turbo-roundabouts reducing crashes by approximately 70%. Regulatory and enforcement measures showed strong evidence for crash reduction but faced notable operational and acceptance challenges. In contrast, perceptual and advisory measures exhibited varying, context-dependent effects. Digital and technological interventions, including intelligent speed assistance and connected vehicle systems, are increasingly studied but remain underrepresented in real-world evaluations, with limited evidence regarding user acceptance and unintended consequences. The review concludes that while physical measures offer high-confidence speed compliance, regulatory and digital interventions provide meaningful safety benefits when implemented at scale with credible governance. The authors highlight significant limitations in the current evidence base, including heterogeneity in study designs, short-term evaluation periods, and inconsistent reporting of operational and social impacts. The study contributes to the field by providing a consolidated framework that integrates diverse evaluation methods and intervention types, addressing gaps in previous syntheses and supporting more comprehensive, context-sensitive speed management strategies.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-07 |
| archive | success | openalex | — | — | 11 | 2026-06-09 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-09 |
| chunk | success | chunk | — | — | 1 | 2026-06-09 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-09 |
| promote | success | — | — | — | 1 | 2026-06-07 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 8 | 2026-06-11 |
| verify | success | — | — | — | 1 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- speed management
- perceptual countermeasures
- regulatory evaluation
- automated enforcement cameras
- signage environment
- speed choice
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, observational prevalence