The next phase of works at the A46 near Dunholme and Welton will allow for the road to reopen during the day.
The work is for a new three-armed roundabout at the A46 Lincoln Road junction, which will also reduce the level of hill on that stretch of road.
Night time closures will be in place between Lincoln Road up to the Scothern Lane crossroads.
The road will be closed from 7pm to 6am, Monday to Friday, for four weeks starting on Thursday, September 3.
Temporary daytime traffic lights will be in use on the A46 near Welton/Dunholme from 9.30am to 3pm, Monday to Friday.
These traffic lights will be in place from Thursday, September 3 up until early December.
A diversion route for the closures will be via the A631 to A15 and A46 Riseholme, and vice versa.
Access for residents that live off Lincoln Road to Dunholme will be maintained via Scothern crossroads and Lincoln Road to Welton.
The project is expected to be completed in spring 2021, with the 30mph speed limit remaining in place for the duration of the scheme.
Karen Cassar, assistant director for highways at Lincolnshire County Council, said: “Our works to improve the A46 near Dunholme and Welton are continuing to progress well and the 24/7 closure of the A46 here is still set to end on Wednesday 2 September.
“However, there’s still a lot of work to do as part of our plans for making this important stretch of road safer for everyone that uses it.
“In addition to continuing to construct the new roundabout, the next phase of work will include improving the quality of the eastern section of A46 near Dunholme and Welton by completely reconstructing.”