M3 Junction 9 improvements project – weekend & overnight closures November
Weekend closures M3 both directions between J8 & J9 6 to 9 November.
Overnight closures M3 southbound exit slip road at J9, 9 to 27 November (except Saturdays & Sundays).
Published: 30 October 2026
Upcoming standard overnight closures for the next few weeks:
- Overnight from Monday 9 until Friday 27 November (excluding Saturdays and Sundays) (8pm to 6am) the M3 southbound exit slip road at Junction 9 will be closed for planting works
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- Switch off satnav and follow signed diversion: M3 southbound exit slip road diversion
Bridge Demolitions
The work will mostly involve using large machines placed on the M3, which will break up the old bridge decks and supports on to the carriageways below, ready to be taken off site and processed for recycling.
Due to the nature of the demolition work the M3 will need to be closed in both directions between junctions 8 and 9 over two weekends. These are planned for:
- 9pm Friday 6 November to 6am Monday 9 November 2026 (southern bridge demolition)
If you require any further information about their closures, please contact the improvements project team via the National Highways Customer Contact Centre. They’re available 24 hours a day by phone: 0300 123 5000 or by email info@nationalhighways.co.uk or visit the National Highways website at www.nationalhighways.co.uk.
The diversion routes are designed to suit all vehicle types.
You are advised not to use a Satnav when following any of the diversions because there is a risk it could direct you down an unsuitable road or back onto our network when it is closed.
Please remember that closures can change at short notice. You can check the latest information on the daily closures page or find live travel information on Traffic England. The travel alerts give details of live incidents on the network.
Updates are also posted on the south east X and Facebook social media accounts which you can share.
Please note lane closure information is not usually provided on the project website or closure bulletins.
In the event of poor weather conditions or other issues out of our control, planned work may be postponed at short notice.
National Highways customer contact centre
0300 123 5000