Local traffic authorities are responsible for setting local speed limits and have powers to introduce 20 mph speed limits and 20 mph zones if they believe it appropriate to do so. The Department encourages and supports any local authority wishing to introduce 20 mph speed limits.
This view is reflected in the Department’s guidance to local authorities on setting local speed limits, published in August 2006. In addition Traffic Advisory Leaflet 9/99 provides best practice guidelines on setting 20 mph speed limits and 20 mph zones.