Huge delays are expected as work on the next phase of construction at one of Berkshire's worst traffic "hotspots" gets under way.
One and a half miles of road will be resurfaced on the M4 at the Chieveley Interchange.
The junction improvement scheme, unveiled by the Higways Agency in April, is expected to take around 18 months to complete and will cost almost £40m.
Both carriageways will be covered with a noise reducing material, west of Junction 13, and new saftey barriers will also be installed.
Disruption to journeys
Congestion at the junction means villages alongside the A34 are often used by so-called "rat-runners" seeking a short-cut.
Drivers have already suffered disruption to their journeys as a result of the roadworks.
Now the Highways Agency says "significant" traffic management scheme will be introduced in order to allow work to start on the building of an underpass and sliproads connecting the A34 to the M4.