Planned maintenance on the A46 Lincoln bypass from June will slow down traffic on the road to 40Mph while works take place.
Although the works begin on June 1, the slower limit will not need to be enforced until June 6.
The £10 million project by Lincolnshire County Council will take 14 months to complete, but will also mean that certain parts of the bypass will be a dual carriage.
The work will be done between Doddington roundabout and Whisby Road junction.
Despite the 40Mph speed limit, traffic will still be able to flow in both directions as normal, and there will also be signed diversions if roads need to close.
Whisby Road will be temporarily closed while a roundabout replaces the current junction.
The project by the council is taking place due to parts of the agreement in order to build Teal Park in North Hykeham.
The road changes will also benefit other council projects such as the Energy From Waste facility, as well as businesses already in the area.