Drivers are being urged to plan journeys in advance as a section of the M3 will be fully closed in both directions over the weekend.
The motorway will shut between Junctions 8 and 9 from 9pm on Friday, January 30, until 6am on Monday, February 2.
National Highways, which is delivering the scheme, said the closure is required to allow the installation of steel beams for new roundabout bridge decks as part of ongoing improvement works.
Drivers of large vehicles, including lorries and freight traffic travelling to and from the south coast, are strongly advised to follow the signed strategic diversion via the A3.
During the closure, northbound traffic will be diverted along the Winchester bypass, onto the A34, then the A303, before rejoining the M3 at Junction 8.
Southbound drivers will exit the M3 at Junction 8 onto the A303, join the A34 and continue onto the Winchester bypass before rejoining the motorway.
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