M27 schemes
The M27 runs along the south coast between Cadnam and Cosham in Hampshire and connects Portsmouth and Southampton along the Solent.
The M27 is a key route for freight, holiday makers and commuters between the ports towards London and journeys to the west from the M3, A3 and beyond.
We’re making a number of improvements to create safer, more reliable journeys for the thousands of people who use it every day.
Project information
M27 junctions 5 to 7 concrete overlay
Concrete roads make up almost 400 miles (4%) of England’s motorway and major A-road network.
Our scheme will see a new low-noise surface installed between junctions 5 and 7 to provide smoother, quieter journeys and extend the road’s life span for years to come.
M27 junction 8 maintenance
Narrow lanes and lower speed limits are in place on the M27 between junctions 8 and 9, in both directions.
Why we've introduced these restrictions
We found corrosion in the steel inside both bridges at the Windhover Interchange.
To keep you safe, we've closed lane 1 in each direction and restricted abnormal loads.
What we're planning
We're refurbishing both bridges to fix the problem for good. We'll repair the concrete supports, replace the bearings and joints, and renew the waterproofing and parapets.
Once this work is complete, we'll remove the current restrictions.
When this will happen
We expect to start this major refurbishment in spring 2027. We'll share more detail on timings and any closures nearer the time.
M27 junction 10 improvements
About our improvements
We’re working closely with Hampshire County Council who are developing junction 10 so it has links in all directions between the M27 and A32.
The improved junction will support economic growth in the area and the new Welborne Garden Village.
More information is available on the M27 junction 10 improvements scheme page.
M27 Junction 3 signal renewal
While we work between 20 April and 29 July 2026, we'll need to close northern and southern sides of M27 junction 3 in turn overnight.
The junction won't be completely closed at any time.
For more information, visit our south east maintenance schemes page.
M27 Southampton Road Hilsea interchange - July to December 2026
Southampton Road bridge is corroding, also its concrete is aging and deteriorating.
Our work will stop further deterioration and extend the life of the bridge.
During our work the M27 stay open.
We'll need lane closures on Southampton Road in July while we work.
We won't need further traffic management until the end of the year.
M27 Nursling drainage and vegetation works - 4 August to 10 September 2026
Closures
4 August to 10 September (8pm-6am)
During this time, a series of overnight lane, hard shoulder and slip road closures will be in place in both directions.
Signed diversion routes will be in place throughout. This is a low-impact scheme, so delays are expected to be minimal.
Please remember that closures can change at short notice. You can find the latest information on our daily closures page or check for current incidents, disruptions and delays. Our travel alerts give details of high priority incidents on our network.
M27 junction 4 westbound vehicle restraint system (VRS) improvements - 28 September to 21 October 2026
Closures and diversions
24 – 25 September - M27 westbound lane 3
Closed overnight (9pm - 6am).
28 September – 21 October - M27 westbound full closure
Closed overnight (9pm - 6am), Monday to Friday nights.
Diversion (28 September – 9 October)
- exit at M27 junction 4 onto M3 northbound to junction 13
- turn right onto Leigh Road (A335), then right again
- return via M3 southbound to rejoin M27 westbound at junction 4
Diversion (14 – 21 October)
- exit at M27 junction 4 onto M3 northbound to junction 12
- use the Allbrook interchange (A335) to return via M3 southbound
- rejoin M27 westbound at junction 4
Please remember that closures can change at short notice. You can check the latest information on our daily closures page. Our travel alerts give details of live incidents on our network.
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