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Effects of city-wide 20 mph (30km/hour) speed limits on road injuries in Bristol, UK

Bornioli, Anna; Bray, Isabelle; Pilkington, Paul; Parkin, John

Authors

Issy Bray Issy.Bray@uwe.ac.uk
Associate Head of Department, Research and Knowledge Exchange

John Parkin John.Parkin@uwe.ac.uk
Professor in Transport Engineering



Abstract

Twenty miles per hour (32 km/hour) or 30 km/hour speed limits represent a potential strategy to reduce urban road injuries and are becoming increasingly widespread. However, no study has conducted a robust evaluation of the effects of city-wide 20 mph speed limits on road injuries. This study reports the effects of such an intervention, based on a natural experiment that took place in Bristol, UK. Based on a stepped-wedge design using count data, negative binomial regressions showed that between 2008 and 2016, the 20 mph speed limit intervention was associated with a city-level reduction of fatal injuries of around 63% (95% CI 2% to 86%), controlling for trends over time and areas. There was also a general trend of reduction of the total number of injuries at city level and in 20 mph roads. These findings highlight the potential benefits of city-wide 20 mph speed limits. We hypothesise that this city-wide approach may encourage a general behaviour change in drivers that, in turn, may contribute to reducing injuries across the city.

Citation

Bornioli, A., Bray, I., Pilkington, P., & Parkin, J. (2020). Effects of city-wide 20 mph (30km/hour) speed limits on road injuries in Bristol, UK. Injury Prevention, 26(1), 85-88. https://doi.org/10.1136/injuryprev-2019-043305

Journal Article Type Article
Acceptance Date Jun 26, 2019
Online Publication Date Jul 13, 2019
Publication Date Feb 1, 2020
Publicly Available Date Nov 30, -0001
Journal Injury Prevention
Print ISSN 1353-8047
Electronic ISSN 1475-5785
Publisher BMJ Publishing Group
Peer Reviewed Peer Reviewed
Volume 26
Issue 1
Pages 85-88
DOI https://doi.org/10.1136/injuryprev-2019-043305
Keywords speed, planning, public health, motor vehicle, longitudinal methodology
Public URL https://uwe-repository.worktribe.com/output/1492332
Additional Information This article has been accepted for publication in Injury Prevention, 2019 following peer review, and the Version of Record can be accessed online at: https://injurypreventio...ryprev-2019-043305.info

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Effects of city-wide 20 mph (30km/hour) speed limits on road injuries in Bristol, UK (239 Kb)
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Licence
http://creativecommons.org/licenses/by-nc/4.0/

Publisher Licence URL
http://creativecommons.org/licenses/by-nc/4.0/

Copyright Statement
© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.







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