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20 mph limit

A speed limit, indicated by signs and repeaters.

There is no traffic calming requirement with 20 mph limits. See the example below, on Tottenham Court Road in Camden. 

20 mph zone

See also: 

A 20 mph zone includes design features aimed at keeping vehicle speeds below 20 mph, such as humps, speed tables, rough surfaces, tight geometry, road narrowings, and so on.