Twenty mile an hour speed limits are nothing new - but in certain areas in Oxford, police and residents say drivers are regularly exceeding the limit.
The Thames Valley force is launching a new speed awareness course for drivers doing more than 20 miles an hour - and says it's not just about fining people but educating them. So how will it work? Asana Greenstreet reports.
A decision is due to be made later on plans to introduce 20mph speed limits in parts of Brighton.
The lower limit has been imposed on 500 streets in the city. Similiar schemes have been introduced in other towns and cities - but not on this scale.
More than 80 drivers have been stopped by police for speeding in a 20 mile per hour zone in Oxford City Centre - in just one morning.
Traffic officers have recently started patrolling streets, including St Giles. 18 drivers were given fines and points on their licence. 61 others were given roadside advice.