It's one of the most controversial road safety schemes of its kind. Today a 20mph speed limit has been imposed on 500 streets in Brighton. Similiar schemes have been introduced in other towns and cities - but not on this scale. Video report from Malcolm Shaw.
More top news
Philippa has the latest weather for the east
Philippa has the latest weather for the west
Nazanin Zaghari-Ratcliffe's five-year jail sentence is confirmed despite her husband's campaign to bring her home.