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Are speed enforcement cameras more effective than other speed management measures? The impact of speed management schemes on 30mph roads.

Mountain, L., Hirst, W.M. and Maher, M. (2005) Are speed enforcement cameras more effective than other speed management measures? The impact of speed management schemes on 30mph roads. Accident Analysis & Prevention, 37 (4). pp. 742-754. ISSN 0001-4575

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Abstract

This paper presents the results of an evaluation of the impact of various types of speed management schemes on both traffic speeds and accidents. The study controls for general trends in accidents, regression-to-mean effects and migration, separately estimating the accident changes attributable to the impact of the schemes on traffic speed and on traffic volume. It was found that, when judged in absolute terms, all types of speed management scheme have remarkably similar effects on accidents, with an average fall in personal injury accidents of about 1 accident/km/year. In terms of the percentage accident reduction, however, engineering schemes incorporating vertical deflections (such as speed humps or cushions) offer the largest benefits: at 44%, the average reduction in personal injury accidents attributable to such schemes, is twice that at sites where safety cameras were used to control speeds (22%) and they were the only type of scheme to have a significant impact on fatal and serious accidents. Other types of engineering scheme (with a fall of 29% in personal injury accidents) were on average less effective in reducing accidents than schemes with vertical features but more effective than cameras. All types of scheme were generally effective in reducing speeds, with the largest reductions tending to be obtained with vertical deflections and the smallest with other types of engineering schemes.

Item Type: Article
Copyright, Publisher and Additional Information: © 2005 Elsevier B.V. This is an author produced version of a paper published in Accident Analysis and Prevention. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Road safety; Speed management; Safety cameras; Regression-to-mean; Trend in risk
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Environment (Leeds) > Institute for Transport Studies (Leeds)
Depositing User: Adrian May
Date Deposited: 03 Aug 2007
Last Modified: 05 Jun 2014 13:07
Published Version: http://www.elsevier.com/wps/product/cws_home/336
Status: Published
Publisher: Elsevier Science
Refereed: Yes
Identification Number: 10.1016/j.aap.2005.03.017
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/2461

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