Powerful evidence for success of 20mph in residential London

The introduction of 20mph speed zones in London has reduced road injuries by more than 40%, according to a report published in the British Medical Journal.

Analysing statistics from 1986 to 2006, the study from the London School of Hygiene and Tropical Medicine found the following benefits in London's 20mph zones:

  • Overall casualties reduced by 41%
  • Deaths and serious injuries to children reduced by half;
  • Pedestrian injuries reduced by one third;
  • Cycling casualties down 17%
  • In areas adjacent to 20mph zones casualties also fell 8%
  • 20mph zones save over 200 casualties per year, including 27 killed or seriously injured

The authors of the report supported the case for extending the zones in London, with the potential of preventing a further 692 casualties a year.

Makes a case for extending 20mph zones
LCC communications officer Mike Cavenett said, "There are strong arguments for the Government to introduce 20mph speed limits in residential areas across the whole country.

"The reduction in loss of life and injury has been shown to be high, and that's before adding the improved health benefits from encouraging more cycling and walking."

The London School of Hygiene and Tropical Medicine is one of the leading centres for research into public and environmental health in the UK.