Traffic police in Essex are defending the use of more speed cameras as a safety tool despite a rise in the number of road deaths in the county.
It was announced on Friday that 116 people died in accidents on Essex roads last year, which is a 24% increase over the year before.
Nick Bursten, the Inspector in Charge at the Road Policing Unit at Chigwell, said the cameras do prevent high speed accidents where they are in place.
She said: "We are tending to have a reduction in the number of serious injury or fatal collisions in those areas.
"But in an awful lot of cases, it's not excess speed as in 'doing faster than the speed limit' which is causing the fatalities."
She told BBC Essex motorists are still speeding in areas which are not covered by the cameras.
"Unfortunately, the problem has seemed to move elsewhere," she added.
Cameras have been used since 1991 to reduce the number of accidents resulting from red light jumping and speeding in the county.
The Chigwell unit covers Harlow and the M25 and M11 motorways.