Default 20mph speed limit

Meeting: 
MQT on 2007-02-21
Session date: 
February 21, 2007
Reference: 
2007/0314
Question By: 
Jenny Jones
Organisation: 
City Hall Greens
Asked Of: 
The Mayor

Question

Will you commission research to assess whether a default speed limit of 20mph in London, with exceptions for main roads, would lead to a decline in the need for traffic lights and the reinstatement of zebra crossings instead?

Answer

Answer for Default 20mph speed limit

Answer for Default 20mph speed limit

Answered By: 
The Mayor

With a blanket 20mph limit in residential areas, it is likely that there would be an attendant reduction in the number and severity of collisions. Given such a reduction, signalised crossings would not be justified in most locations. It is therefore very unlikely that any new signalised pedestrian crossings would be installed in 20mph areas. The question then is whether to replace existing signaled pedestrian facilities in 20mph areas with zebra crossings. This would have benefits to the environment and reduce queues. I have therefore asked TfL to develop a framework that will allow a quantitative assessment of these factors on a site-by-site basis depending upon the casualty history, traffic flow, etc.