A paperwork blunder led to 25,000 motorists being given points and ordered to pay £60 fines.
But now the Dorset Safety Camera Partnership has been forced to admit a legal error which was spotted by a judge during a case involving lorry driver Alan Dawe last year.
She noticed that paperwork for the camera indicated a road used to mark out the 30mph zone on the A35 at Chideock, Dorset, didn't actually exist.
Instead of using the correct name Duck Street, it used Seatown Road.
It means every conviction issued by the camera towards Exeter since 1997 is void. The partnership admits other drivers might want to be reimbursed.