Remedial work on the A3124 road, near Rosemoor Garden in Devon, has been completed two weeks ahead of schedule.
The road, which is between Beaford and Great Torrington, had shown signs of cracking.
In the past eight weeks, it was closed. A new 25m retaining wall was built to support it and prevent vehicles from crashing.
Devon County Council Cabinet Member for Highway Management, Stuart Hughes, said: “The contractor working on site has pulled out all the stops, and our thanks go to them for being able to complete this scheme two weeks ahead of schedule.
“Local people have been extremely patient while the work has been carried out but I’m sure everyone will be pleased the road is re-opening early and is in better shape than before.”
The councillor for Torrington Rural, Andrew Saywell, said, “I am delighted that the A3124 is reopening early.
“I know the closure was inconvenient for many residents but I cannot stress enough how important this work has been, strengthening the structural integrity of the road and preventing a collapse that could have closed this vital road indefinitely.
“During the closure the council has worked well with the community to keep everybody up to date and I would like to thank all residents, businesses and the Town and Parish Councils for their patience while this important work took place.”
The road will reopen on Friday, 16th November.