Vision zero: a toolkit for road safety in the modern era

Kim, Ellen; Muennig, Peter; Rosen, Zohn · 2017 · OpenAlex-citations

DOI: 10.1186/s40621-016-0098-z

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Summary

This review article examines Vision Zero (VZ), a public health framework originally adopted by Sweden in 1997 that aims to eliminate fatalities and serious injuries from road traffic crashes. The authors address the global burden of road traffic injuries, noting that over 1.2 million people die annually from such incidents. The paper critiques traditional road safety approaches that blame individual driver error, arguing instead for a "systems perspective" where responsibility for safety is shared between road users and system designers, including infrastructure planners and vehicle manufacturers. The study’s primary objective is to update the literature on VZ, explore its philosophical shift toward treating crashes as preventable public health issues, and provide policymakers with a toolkit of design and enforcement strategies adaptable to local contexts. The authors analyze VZ through three main components: its underlying philosophy, specific design principles based on human tolerance for mechanical forces, and practical implementation tools. The design principles are grounded in the concept that kinetic energy must be managed to stay below injury thresholds. Specifically, the paper outlines speed limits for safe interactions: pedestrians and cyclists should not be exposed to vehicles traveling over 30 km/h; car occupants should not collide with other vehicles at speeds over 50 km/h in 90-degree crossings; and frontal impacts between similar-weight vehicles should not exceed 70 km/h. To achieve these thresholds, the paper reviews structural interventions such as median barriers, modern roundabouts, speed humps, and pedestrian islands, as well as enforcement methods like speed cameras, red light cameras, and technological vehicle improvements. The review synthesizes evidence regarding the efficacy of these interventions. It finds that while cable median barriers reduce injury severity by up to 85% compared to hazardous objects, they increase crash frequency, whereas concrete barriers are more durable but transfer more energy to occupants. Modern roundabouts are shown to reduce injury crashes by 30–50% and fatalities by 50–70%, though they may increase risks for cyclists and vulnerable users in areas unfamiliar with the design. Speed humps significantly reduce injury odds, particularly for children, but are less effective in variations like speed tables. Pedestrian islands reduce crash risk by up to two-thirds, though compliance varies with weather and demographics. Enforcement tools, such as speed and red light cameras, demonstrate significant reductions in collisions and injuries, although red light cameras may increase rear-end crashes. The significance of this work lies in its assertion that safety and mobility are not mutually exclusive but can be jointly promoted through proper system design. The authors conclude that VZ provides a critical paradigm shift, moving away from accepting traffic deaths as a "necessary evil" toward a model where system designers are accountable for creating environments that forgive human error. The paper emphasizes that successful implementation requires considering local infrastructure, culture, and user demographics, as no single solution applies universally. By integrating design and enforcement, VZ offers a comprehensive strategy to treat road safety as a preventable public health epidemic.

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Topics

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• traffic safety culture