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20 mph speed limit area

On 20 July 2014 the City of London Corporation implemented a 20mph speed limit across almost all of the City. View a map of the area to have a 20 mph speed limit (1MB). View our YouTube video on the effect that the 20 mph speed limit will have and other road danger reduction steps the City will be taking to improve the City's streets.

The scheme is an important part of the City's Road Danger Reduction Plan (200KB).​

Why has the City done this?

We estimate that a 20mph speed limit will reduce casualties in the City by 7% equal to approximately 30 per year. The analysis providing this predicted reduction reviewed the locations where and times when average traffic speeds were above 20mph. 

Will there be an impact on journey times?

Yes. If the average City spot traffic speed of 21.9mph is reduced to 20mph a 1.6-mile journey across the City journey times will increase by 25 seconds.

Will a 20mph speed limit be enforced?

Yes. The Commissioner of Police for the City of London supports the 20mph speed limit because of its potential for reducing casualty frequency and severity and the City of London Police will enforce the 20mph speed limit.

How will I know that I'm in a 20mph speed limit area?

Traffic signs and road markings clearly indicate the start and extent of the 20mph speed limit area.

The whole of the City of London has a 20mph speed limit except for the A3211 between Victoria Embankment and Byward Street; the lanes and alleys between this red route and the River Thames; and the A1210 Mansell Street, Goodman's Yard and Minories.

Most of the London boroughs neighbouring the City already have extensive 20mph speed limit areas. There will be a continuity of the speed limit across Central London and the majority of the City's boundary roads will also have a 20mph speed limit.

Will there be road humps or chicanes?

No. Physical traffic calming measures such as road humps have not been introduced as part of the 20mph speed limit scheme. The 20mph speed limit is expected to be self enforcing; we expect most drivers to abide by the 20mph speed limit without being forced to slow down by intrusive infrastructure. We expect this to happen because of the existing average City spot speed of 21.9mph and the relevant government guidance, which is based on experience of 20mph speed limits elsewhere.

Isn't this about raising money?

No. All penalties for speeding offences are paid to central government. The City does not receive any income from speeding offence penalties.

Red routes (Transport for London)

Transport for London (TfL) will experiment with a 20mph speed limit on two routes through the City where TfL is the local traffic authority, from Farringdon Street to Blackfriars Bridge and from Norton Folgate to London Bridge. 

17 January 2014
Last Modified:
25 July 2014