Police are reminding drivers that the A77 road will be completely closed between Stranraer and Girvan this weekend.
The road will be closed at 8pm on Friday 3 November, and will re-open at 6am on Monday 6 November.
The closure is due to damage from winter storms in 2014, and will allow Scotland TranServ to establish the working site and install supportive piling.
A fully signed 56-mile diversion will be in place over the weekend.
The family of a motorcyclist killed in an accident on the A77 between Stranraer and Portpatrick say he died doing what he loved.
James Harvey, 64, from Prestwick, was driving a BMW motorbike, which was involved in a collision with a Subaru car on Thursday 6 October.
He was pronounced dead at the scene, and his family have released a statement, saying he "lived every day to the fullest".
The A77 is closed in both direction at Cairnryan in Dumfries and Galloway, due to flooding.