Speed cameras are being switched on at a notorious accident blackspot on the Isle of Grain, in Kent.
The cameras calculate the average speed of a driver
After 57 accidents, seven deaths and nine serious injuries, permanent average speed cameras will regulate traffic at Fenn Corner, on the A228.
The new cameras will cover a four-and-a-half mile stretch of road.
Local road safety campaigner Maureen Stanney said she hoped the cameras would give the message to drivers that they must slow down.
Rachel Wall, from the Kent and Medway Safety Camera Partnership, said the cameras were based on a calculation of a driver's average speed, stopping them from slowing down and speeding up between each one.
"It will take a photograph as drivers enter the site, along the site, and then as they leave, calculating their average speed between those two points," she explained.
Two years ago, Medway Council promised to tackle dangerous sections along the A228.
Keith Hanshaw, head of traffic parking and waste services, said other measures had since been introduced on the road to reduce the speed limit, including no overtaking and vehicle actuated speed display signs.