The A9 is to be reduced to just 10mph during a £1.2 million programme of works.
Four locations between Perth and Inverness are to be resurfaced following an investment from Transport Scotland.
Starting next week, the works are expected to take up to two months and will address any defects, cracks or potholes.
Bear Scotland say the reduced limit is needed for the safety of both road workers and motorists, and a convoy system will be in place at each location during working hours.
The first section to be resurfaced will be southbound road at Drumochter. The works will take place between 7am and 7pm from June 13 and last for two weeks.
Outside of the working hours a lane closure will remain in place on the dual carriageway until the works are complete. No works are planned for weekends to minimise disruption.
Works at Newmill, four miles north of Perth, will take place overnight from June 19 for two weeks.
The 10mph convoy system will be removed during the daytime, however a speed restriction of 30mph will remain in place as traffic will be running over a temporary surface.
Resurfacing to half kilometre section of the southbound dual carriageway is planned at Ballinluig for two weeks. Outwith working hours, a lane closure will remain in place for the safety of motorists until the resurfacing is finished.
The final surfacing improvement works will take place on the southbound dual carriageway eight miles south of Inverness, and will see approximately 500m of the road resurfaced. Outwith working hours, a lane closure will remain in place for the safety of motorists until the resurfacing is finished.
Eddie Ross, BEAR Scotland’s north west unit representative, said: “The £1.2million investment from Transport Scotland will allow our teams to carry out these essential resurfacing works for four sections of the A9, greatly improving the condition and safety of the route at these areas.
“We’ve taken steps to minimise disruption as much as possible by avoiding working at weekends at all four sites, and carrying out work overnight at Newmill where the route is single-carriageway.”