Work was supposed to start last week on resurfacing the three-mile stretch between Peterborough and Huntingdon but was delayed by what the Highways Agency initially described as "a shortage of construction materials".
When pressed for more details, it said that maintenance contractor Amey had suffered "a delay in sourcing the correct type of safety barrier for the work".
Amey will now start work this Thursday (11th September), the Highways Agency has confirmed.
The resurfacing project includes renewal of road studs and road markings between junctions 15 and 14, near Glatton Ways and Wheatsheaf flyover. It is scheduled to be completed on Friday 17th October, weather permitting.