National Highways is advising drivers to leave extra time as overnight closures on the M3 in Hampshire start this coming week as work to repair the Tower Hill bridge crossing the busy motorway gets underway.

There is a combination of northbound and southbound motorways closures, as well as three full night-time closures of Up Street and temporary two-way lights underneath the bridge while works take place.

The M3 northbound between junction 9 and 7 will be closed overnight from 9pm to 6am from Monday, October 31, to Saturday, November 12. Traffic will be diverted via the A33 Basingstoke Road and A30 to rejoin at junction 7.

The M3 southbound between junctions 7 and 9 will be closed overnight from 9pm to 6am from Monday, November 14, to Saturday, November 26. Traffic will be diverted via the A30 and A33 Basingstoke Road to rejoin at junction 9.

The Up Street, which runs underneath the M3, will be closed between Dummer Down Lane and the A30 Winchester Road from 9pm to 6am on Monday, December 5, Monday, February 20, 2023, and Tuesday, May 2, 2023, to carry out concrete repairs.

Temporary two-way traffic lights with narrow lanes will be in place under the bridge from Tuesday, December 6, until Tuesday, May 2, 2023.

National Highways provides live traffic information via its website (, local and national radio travel bulletins, electronic road signs and mobile apps.

Local Twitter services are also available at @HighwaysSEAST.