M3 Junction 9 Closures
Reminder for drivers in the Winchester area – National Highways’ weekend closure for M3 junction 9 scheme starts tomorrow evening A reminder that National Highways has announced a series of closures to support the delivery of the M3 junction 9 improvement scheme.
The M3 motorway will remain open, but the M3 junction 9 roundabout will be closed over three weekends, with the first starting from tomorrow evening, Friday 31 July, and further closures across the summer to carry out essential tie-in works as part of the larger project. These works will connect the new bridges to the existing roads on the roundabout, so National Highways can switch traffic on to the new roundabout later this year.
In addition, the M3 junction 9 northbound entry slip road will be closed from 9pm, Friday 31 July and will stay closed until winter 2027.
Drivers are being advised to plan ahead and follow the official signed diversion routes rather than sat navs.
With the roundabout system closed, traffic will be unable to access or leave the M3/A34 at Junction 9 and, as a result, anyone wishing to join or exit these roads will need to follow the signed diversion routes and use alternative routes into and out of Winchester. There will also be no access across the M3 at Junction 9 to or from the A272 and the A31 for traffic travelling to or from the Alresford area.
As traffic adjusts to these closures and diversions, congestion is expected on all key routes in and around Winchester, particularly on the one-way system and at other M3 junctions. Anyone planning to travel should take this into account and allow extra time for their journey.
The key information is as follows:
• From 9pm on Friday 31 July, the M3 junction 9 roundabout, slip roads and several surrounding roads will all be closed until 6am on Monday 3 August. The same applies for the weekends of 21–24 August and 11–14 September.
• During each closure, the A34, A33 and A272 Spitfire Link will be closed. If you’re travelling in this area, please check which roads are affected and plan your route before you set off. Signed diversions will be in place for every affected road.
• In addition, the M3 junction 9 northbound entry slip road will be closed from 9pm on Friday 31 July and will stay closed until winter 2027.
You can find up-to-date information, diversion maps and Google Maps route links on the National Highways project website linked in the comments below.