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.
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Tuesday night's weather for the east of the region
Tuesday night's weather for the west of the region