Smallbrook Lane and Ashey Road are to reopen in just over a week's time — although another popular route will shut.
From Monday March 14, Carters Road will shut for up to five weeks.
The closure will be at the eastern end of the road, although access to all properties will be maintained at all times via the Upton Road end of Carters Road.
Drivers will have to divert via Upton Road and Ashey Road.
At the same time, both Ashey Road and Smallbrook Lane will reopen in both directions, with just the junction itself controlled by three-way temporary traffic lights.
Island Roads claims "good progress" is being made on the project to improve safety at the busy Smallbrook roundabout.
Cllr Phil Jordan, IW Council cabinet member responsible for transport and infrastructure, said:
“It’s not been easy resolving the problems which caused this junction to have one of the worst safety records on the Island. I am thankful we are nearing a solution for all road users here.
“Having battled the winter elements, Covid and a well-documented burst pipe, good progress has been maintained and it's encouraging to see we are now moving into the final phase of the works, with the end in sight, and a better, safer junction which has been badly needed for so long."
Work to create the new carriageway area on the east side of the road and at Smallbrook Lane is almost complete, the firm says.
The focus is now shifting to the west side of Ashey Road to realign the kerbs and install drainage and new lighting before the whole area is surfaced.
The current forecast is that the major works will be completed at the beginning of April, with the surfacing and line marking undertaken overnight.
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