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Support and compliance with 20 mph speed limits in Great Britain

Tapp, Alan; Nancarrow, Clive; Davis, Adrian


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Adrian Davis
SRF Behaviour Chge and Transitional Res


© 2015 Elsevier Ltd. All rights reserved. There are a number of challenges relating to both the support of and compliance with speed limits. The introduction of 20 mph limits in Great Britain is no exception: the recent rise in the deployment of these limits in urban settings has created a need to understand these issues in more depth. This paper reports a study undertaken by the authors that used a population wide survey of GB drivers to explore how support and compliance were interlinked. Whilst as expected many supporters said they would comply with the limits, and many opponents might not comply, more surprisingly it was also found that some supporters claimed not to comply, while some opponents of 20 mph limits were compliers. Explanations included the strong likelihood of strong moral adherence to not breaking laws amongst opponent-compliers, and self-enhancement bias amongst supporter-non-compliers. This paper explores the incidence of these effects and their implications in detail.


Tapp, A., Nancarrow, C., & Davis, A. (2015). Support and compliance with 20 mph speed limits in Great Britain. Transportation Research Part F: Traffic Psychology and Behaviour, 31, 36-53.

Journal Article Type Article
Acceptance Date Mar 6, 2015
Publication Date May 1, 2015
Journal Transportation Research Part F: Traffic Psychology and Behaviour
Print ISSN 1369-8478
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 31
Pages 36-53
Keywords 20 mph limits, driver compliance, reasons, behaviour changes
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