Cost benefit analysis of 20 mph zones in London.


Steinbach, R; Cairns, J; Grundy, C; Edwards, P; (2013) Cost benefit analysis of 20 mph zones in London. Injury prevention, 19 (3). pp. 211-3. ISSN 1353-8047 DOI: https://doi.org/10.1136/injuryprev-2012-040347

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Abstract

: Evidence suggests that 20 mph zones are an effective intervention to reduce casualties from road traffic crashes in urban areas. This analysis compares the costs of construction of the 20 mph zone intervention in high and low casualty areas in London to the value of casualties avoided over 5 and 10 year time horizons. Probabilistic sensitivity analyses were conducted to quantify uncertainty in the results associated with model parameters. Results indicate a net present value (NPV) of £18 947 (90% credible limits -£75 252 to £82 021 2005 prices) after 5 years and £67 306 (£-29 157 to £137 890) after 10 years when 20 mph zones are implemented in areas with one or more casualty per kilometre of road. Simulations from our model suggest that the 'threshold of casualties' where NPVs become positive using a 10 year time horizon is 0.7 casualties per kilometre.<br/>

Item Type: Article
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Faculty of Epidemiology and Population Health > Dept of Population Health (2012- ) > Dept of Nutrition and Public Health Interventions Research (2003-2012)
Faculty of Epidemiology and Population Health > Dept of Population Health (2012- )
Faculty of Public Health and Policy > Dept of Health Services Research and Policy
Faculty of Public Health and Policy > Dept of Social and Environmental Health Research
Research Centre: Transport & Health Group
PubMed ID: 22936701
Web of Science ID: 319208700011
URI: http://researchonline.lshtm.ac.uk/id/eprint/210205

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