M27 J4-11 Smart Motorway

Scheme outline

Upgrade of the existing M27 between junction 4 (the M3) and junction 11 (Fareham) to Smart Motorway. New technology and Emergency Areas will be installed to enable variable speed limits to operate, and the hard shoulder will be converted into a permanent running lane to provide four continuous lanes throughout this section. Smart Motorway upgrade works are also planned on the M3 between Winchester and Southampton, and the two schemes will connect at M27 junction 4.

Between junctions 7 and 8, the motorway already has four lanes plus hard shoulder, and these will be retained in their current state.

The work also includes reconstruction work to the motorway itself, including replacement of the central reservation with a new concrete barrier.

This scheme is part of the Smart Motorways programme of works.

Under construction
Other upgrade
under motorway restrictions
Highway authority


5 March 2018

Advanced works for this scheme will start on the 15th March 2018. These advance works will include surveys of the pavements, drainage, ducting, and ecology along the route.

The survey information obtained will be used to inform the scheme’s detailed design for the main work, which will follow closely after the surveys, with a planned scheme completion of spring 2021.

12 March 2018

A consultation period on the proposed introduction of variable mandatory speed limits has opened. The consultation period began on the 12th March and will continue onto the 10th April.

Preliminary works will commence on the motorway on the 15th March, with signage on approaches to the motorway appearing recently.

25 June 2018

A series of public information exhibitions are currently being undertaken, and the following construction dates have been provided.

  • Hard shoulder plane and resurfacing: Aug 2018 – Sept 2018
  • Junctions 4-5: Nov 2018 – Sept 2019
  • Junctions 5-8: Feb 2019 – Nov 2020
  • Junctions 8-9: May 2019 – Sept 2020
  • Junctions 9-11: Aug 2019 – Dec 2020
  • Commissioning: Nov 2020 – Spring 2021
1 January 2019

Main works in January 2019, with traffic management being in place between junctions 4 and 8, until June 2019.

24 January 2019

Narrow Lanes are now in-situ between Junction 4-5, in both directions with a mph maximum speed limit in place. Construction works have begun in the central reservation of the motorway, with works due to extend to Junction 7 within the coming weeks.

2 April 2019

The 50 mph narrow lanes and average speed check now extends from Junction 4 - Junction 9 of the M27.

A lot of works has taken place between Junctions 4-8 with all of the overhead signage being removed along with the central reservation. Works have now begun on laying new communication cables and foundations for the new carriageways and central reservation.

1 March 2020

The work between J5 and J7 has been going on for 12 months now. Since November Highways England have been saying they are now working on the verges, but the new central barrier is not complete and traffic is still running along the verge.

3 March 2020

Work continues between J4 and J5, despite the schedule shared with the public (posted above) showing that this section should have been completed five months ago. No updated schedule has been published, and there is no word on whether the rest of the scheme is running behind too.

More information


With thanks to Tom Kitcher for information on this page.