Speed Limits

MQT on 2012-10-17
Session date: 
October 17, 2012
Question By: 
Fiona Twycross
Labour Group
Asked Of: 
The Mayor


I have been asked to ask you the following question by a constituent. In 2009, a Transport Committee investigation found that in areas where 20 mph has been introduced in London there has been a 42% reduction in casualties, and that 20 mph limits offer the potential to increase levels of walking and cycling. A national survey carried out by Sustrans in February 2012 showed that 70% of the public want residential speed limits to be dropped to 20 miles per hour to make their streets safer. Will you commit to leading on a London-wide roll-out of a default 20 mph speed limit?


Answer for Speed Limits

Answer for Speed Limits

Answered By: 
The Mayor

My Transport Strategy acknowledges the benefits of 20mph zones in making streets safer for pedestrians and cyclists. Research by the School of Hygiene and Tropical Medicine found that 20mph zones have reduced casualties by up to 40 per cent in locations where they have been implemented in London. Accordingly, Transport for London (TfL) has long supported the boroughs in implementing 20 mph zones. In fact, TfL has funded hundreds of these zones through the £147.8 million annual financial assistance that is provided through the Local Implementation Plan (LIP) process.

TfL also looks to include lower speed limits as part of new scheme designs where appropriate. For example, as part of the implementation of the new Barclays Cycle Superhighway 8, a 20mph speed limit has been introduced on Old York Road in Wandsworth.

In considering the introduction of lower speed limits a number of factors need to be taken into consideration including potential safety benefits, the characteristics and function of the road in question, the impacts on traffic flow and the practicality and cost of implementation and enforcement. As such, the potential for new 20mph limits will vary by area and road type.