Low-Speed Zone Guide

Bray Sharpin, Anna; Adriazola-Steil, Claudia; Job, Soames; Obelheiro, Marta; Welle, Ben; Tolga Imamoglu, Celal; Bhatt, Amit; Liu, Daizong; Lleras, Natalia; Luke, Nikita · 2021 · Crossref

DOI: 10.46830/wrigb.18.00063

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Summary

The *Low-Speed Zone Guide* addresses the critical issue of road traffic safety, specifically focusing on speed management as a primary strategy to reduce fatalities and serious injuries. With approximately 1.35 million people dying annually from road crashes, the guide identifies speed as a leading factor in crash likelihood and severity, particularly for vulnerable road users such as pedestrians, cyclists, and motorcyclists. The document aims to empower communities, decision-makers, and urban planning professionals with the tools to plan, design, implement, and evaluate low-speed zones effectively. It emphasizes that while speed limits alone are insufficient, physical design measures can create "self-enforcing" environments that naturally encourage safer speeds, thereby improving safety, public health, and quality of life. The guide synthesizes evidence from global case studies and technical literature to provide strategic guidance across the entire lifecycle of a low-speed zone project. It outlines four key phases: planning, design, construction, and post-construction operation. The planning phase involves site selection based on need, suitability, and feasibility, alongside stakeholder engagement and funding identification. The design phase details principles for creating physical traffic-calming measures, such as narrowing streets and managing intersections, to achieve target speeds. The guide stresses that low-speed zones must be adapted to local contexts, ranging from single blocks to entire cities, and highlights the importance of aligning zone boundaries with significant urban features. Key findings underscore the necessity of physical design interventions over regulatory changes alone. Evidence cited indicates that low-speed zones with physical traffic-calming measures reduced average speeds by 15 km/h (9.3 mi/h), whereas zones with only speed limit changes saw a drop of only 1.6 km/h (1 mi/h). Safety data from London demonstrates that converting streets to 32.2 km/h (20 mi/h) zones with physical measures resulted in a 46% reduction in killed and seriously injured crashes overall, and a 50% reduction for children aged 0–15. The guide recommends target speeds of 30 km/h or lower, noting that pedestrian fatality risk rises exponentially above this threshold. Additionally, the document highlights broader benefits, including increased physical activity, reduced emissions, and economic development through more inviting street environments. The significance of this guide lies in its comprehensive, practical approach to implementing low-speed zones in diverse contexts, particularly in low- and middle-income countries where road safety infrastructure is often lacking. It concludes that successful implementation requires robust stakeholder engagement to address concerns about traffic diversion and noise, as well as rigorous monitoring and evaluation to demonstrate success and sustain political will. By providing a framework for self-enforcing street design, the guide supports the broader "Safe System" approach to road safety, aiming to eliminate traffic fatalities and severe injuries while promoting equitable and sustainable urban mobility.

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• speed management