New average speed cameras on the A90 now in operation
It is hoped the cameras will help save lives, after six fatal accidents on the road.
Average speed cameras on the A90 between Dundee and Stonehaven are now in operation.
Work started on a £2m project to install 30 cameras on the 50-mile stretch between in May this year.
Six people have died in crashes on the A90 since 2014.
But the Scottish Government said a similar average speed camera scheme on the A9 had reduced fatal and serious accidents by 36%.
Transport Minister Humza Yousaf said: "I have confidence that the average speed system, which is now operational on the 51.5-mile stretch of the A90 between Dundee and Stonehaven, will help save lives.
"The evidence from other average speed systems across Scotland continues to demonstrate the various benefits these cameras will bring to drivers."
Mr Yousaf said more than three in every five vehicles between Dundee and Stonehaven speed with one in five exceeding the limit by more than 10mph.
He added: "While the previous strategy of fixed cameras and mobile enforcement saw casualties reduce at a number of camera locations across the route, average speed cameras will help to make the A90 safer for all road users."
"Six people have lost their life on the A90 between Dundee and Stonehaven since 2014.
"Any death on our roads is one too many, and I look forward to seeing similar results on the A90 as we've seen on the A77 and A9 in reducing casualties and improving driver behaviour."