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.

Click the links below to find out more.

Project information

Upcoming maintenance projects listed alphabetically by road name.

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.

Visit the project webpage

This part of our network has a poor safety record and sees high volumes of traffic at peak periods.

We intend to make improvements to both junction 8 on the M27 and the A27 Windhover roundabout by adding extra lanes and improving signalling to ease congestion.

Update

After the Public Enquiry during Summer/Autumn 2022 which upheld a challenge to the proposed M27 J8 scheme, the DfT decided that following the unfavourable outcome of the enquiry for National Highways, the proposed scheme no longer met their needs or value for money threshold and was subsequently cancelled.

We've had to postpone our planned maintenance works until further notice.

Narrow lanes and speed restrictions are in place on M27 in both directions between junctions 8 to 9 due to earlier safety barrier damage and investigation work.

Please check back for future updates.

Update

We'll still need to repair some of the bridge joints and put in some waterproofing to protect the bridge from severe weather. These joints allow the bridge to expand and contract in different temperatures and can become damaged if exposed to too much rain.

From inspection both structures forming the M27 Junction 8 Windhover Interchange were suffering from extensive corrosion of steel reinforcement on supports.

Structural Assessments informed the need for structural safeguarding including restriction of all abnormal loads over the structure and closure of Lane 1 in each direction.

A scheme is currently in development to carry out major refurbishment of both structures to remove these restrictions and extend their service life.

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.