Plan ahead to avoid festive delays – with just 4 weeks to go, make sure you’re ready for the M27 closure between Junctions 9 and 11.

From 8pm on 24 December 2025 until 4am on Sunday 4 January 2026, the M27 will be closed in both directions between J9 (Whiteley) and J11 (Fareham).

The closure of this section of the M27 is necessary to deliver a new underpass that will be constructed using a timesaving engineering technique, replacing what would otherwise have been many months of lane restrictions, speed limits, and overnight works.

There will be a signed diversion route along the A27, which is mostly two lanes in each direction, during the closure. This is expected to be busy every day and drivers should be prepared for severe delays.

To reduce disruption and help keep traffic moving during the closure, a series of measures are in place or planned.

Over the closure period, a giant pre-constructed concrete structure (pictured below) - weighing approximately 8,500 tonnes (2.5 times heavier than HMS Victory) - will be slid 65 metres into a trench cut into the motorway embankment, from its current construction location on the north of the M27. The motorway will then be fully reconstructed above it.

Find out more: https://www.hants.gov.uk/News/20252611FourWeeksToGoM27