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National Highways has advised of upcoming works that will affect the M3, A34 and A33 as part of an ongoing improvements programme. These works will take place over several weekends and will require temporary closures to ensure the safety of road users and the workforce.
M3 – Full Weekend Closures
To enable the safe installation of steel beams for the new M3 roundabout bridge decks, the M3 will be fully closed in both directions between junctions 8 and 9 on the following weekends:
- 9pm Friday 30 January to 6am Monday 2 February 2026
- 9pm Friday 13 February to 6am Monday 16 February 2026
Local diversion routes can be found here: M3 junction 9 to 8 northbound and southbound diversion. Operators of HGVs, large vehicles, and freight travelling to or from the coast are strongly advised to use the designated strategic diversion via the A3. This route is designed to avoid congestion on local roads and reduce delays for long distance and commercial traffic.
A34 and A33 – 24-Hour Southbound Closure
Following November’s successful removal of the northern beam at Kings Worthy Bridge, a replacement beam will now be installed. Due to the size and reach of the crane required, a full southbound closure is necessary on:
9pm Saturday 7 February to 9pm Sunday 8 February 2026
- A34 southbound from Three Maids Hill
- A33 southbound from the Cart and Horses junction
A signed diversion route will be in place via the A34, A303 and M3. Further details are available here: A34/A33 southbound diversions.
These works will have an impact on journeys, particularly for freight operators and businesses that rely on reliable movement of goods. Some delays are expected during these essential works.
