Highways England will carry out works to repair Spaghetti Junction in Birmingham over the next six months.
The work will include repairs and renewing the waterproofing of the iconic road structure. Highways England say the ageing structure is in need of repair and the work is unavoidable.
They are working closely with Birmingham City Council to plan the roadworks at M6 junction 6 and on the A38(M) Aston Expressway.
Work will begin on Monday 27 June, and is expected to last until Christmas. However, Highways England has stressed engineers cannot tell the scale of concrete damage until the carriageway is closed and the road surface removed.
Highways England project manager, Jess Kenny, said: “The road was built a considerable number of years ago and has reached the end of its life. We need to work now to ensure this part of Spaghetti Junction is protected for years to come.
“If we don’t act now, water will cause more and more damage in the structure; corroding the steel reinforcement bars and causing damage to the concrete itself. Leaving it alone is not really an option and would mean bigger and more disruptive roadworks in future.”