20mph speed zones cut road injuries by 40%, study says

12.28 | 11 December 2009 | | 1 comment

A study by the London School of Hygiene and Tropical Medicine suggests that 20mph speed zones have cut road injuries by more than 40% in London.

In particular the number of children killed or seriously injured has been halved over a 15-year period.

The study estimates 20mph zones have the potential to prevent up to 700 casualties in London alone and as a result concludes that UK cities should have more 20mph zones.

Dr Chris Grundy, a lecturer at the London School of Hygiene and Tropical Medicine, said: "This evidence supports the rationale for 20mph zones, not just in major cities in Britain, but also in similar metropolitan areas elsewhere.

"Indeed, even within London, there is a case for extending the currently limited provision of such zones to other high casualty roads."

A spokesman for the DfT said the study backed their own research: "Our road safety strategy consultation recommends that local authorities introduce, over time, 20mph zones or limits into streets around schools, and which are primarily residential in nature, to protect pedestrians and cyclists.

"This will save lives and make people feel more secure in walking and cycling on those streets."

Click here to read the full BBC News report.



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    Neither this article or the BBC one distinguishes between 20 mph zones and 20 mph speed limits. 20 mph zones must be “self-enforcing” which is normally achieved with traffic calming which lowers vehicle speeds below 24 mph (85%ile). 20 mph speed limit areas rely on natural features such as parked cars or other features which naturally lower speeds to 24 mph. They have to have repeater signs.

    David Poxon, Leicester City Council
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