Drivers in Hampshire are being warned of a complete closure of the M27 motorway between Junctions 9 at Whiteley and 11 at Fareham as part of a major infrastructure upgrade. Hampshire County Council, in partnership with National Highways, will carry out extensive engineering work to install a new dual carriageway underpass linked to the Junction 10 improvement scheme.

The motorway will be shut in both directions for the duration of the project, allowing construction teams to complete the complex installation safely and efficiently. The decision to carry out the full closure rather than a series of phased restrictions is aimed at shortening the overall disruption period and reducing the long-term impact on motorists.

Traffic will be diverted along the A27 during the closure period, with clearly marked alternative routes in place. Authorities have advised that congestion is likely, particularly during daytime travel hours, and drivers are urged to allow extra time for their journeys or seek other routes where possible.

The scheme forms part of wider efforts to improve connectivity and ease congestion in the Fareham area. Once complete, the new underpass is expected to improve access to the M27, support local development and enhance long-term transport resilience across south Hampshire.