Work on a major junction of the M4 at Reading and Wokingham will begin next week.
The improvement works at junction 10 will mean lane closures on the slip roads with temporary speed limits in place from Monday (October 17).
According to Highways England the scheme will cut congestion and lead to safer journeys for drivers using the junction.
To minimise further disruption for motorists, Highways England will at the same time repair the link road and strengthen the slip road bridge at the junction to prolong the life of the structure,
All work will take place on the slip roads at the junction and not on the main carriageways of either the M4 or A329(M).
Gemma Luckhurst, Service Delivery Manager at Highways England, said: “Combining these two schemes will bring the benefits of improved safety at the junction and better journeys while minimising the disruption caused to drivers.”
Work will start on Monday with single narrow lanes on the slip roads with a 40mph speed restriction in place.
There will also be a 50mph speed restriction on the approaches to the M4 and the slip roads.
Some overnight and weekend slip road closures will be required during the scheme.
Highways England has said full details, including diversions, will be publicised in advance.
The schemes, which are scheduled to be completed by November 2017, will also involve improving drainage, some demolition work and the installation of waterproofing material.