Work will start early next year to switch on up to 26 speed cameras and traffic light cameras in Bristol.
The announcement follows collaboration between Bristol City Council, the Police and Crime Commissioner Sue Mountstevens and Chief Constable for Avon and Somerset Police Nick Gargan.
The announcement was made at a special road safety summit where the Police Commissioner and the Mayor, George Ferguson, also appealed for more local communities to get involved in speed watch schemes to help boost enforcement of 20, 30 and 40 mph limits.
Speed cameras were switched off in Bristol in March 2011 when funding ceased from central government. Revenue raised from the cameras is used to fund their maintenance and enforcement.
Ferguson said: “I have agreed with the police to start work on preparing speed cameras to be switched back on and boost the number of community speedwatch programmes in the city.”
Chief Constable Nick Gargan said: I am pleased that the cameras are going to be switched back on.
"National research shows that they have a positive impact on driver behaviour and we have been working with the council to identify a cost neutral way to reactivating them.”
There were 147 people killed or seriously injured on Bristol roads in 2012, a 7% reduction on 2011. There were 1,338 total casualties on Bristol roads in 2012, a slight increase on 2011 but 18% below the 2005 – 2009 average.