M3 junction 9 improvements project update
details received from National Highways
The M3 junction 9 improvements project is getting ready to start its main work in April.
In preparation of the main traffic management going in, we will be installing temporary CCTV and average speed cameras alongside the M3 at junction 9, the A34 and the A33. These cameras will be covered and not be in use until main works begin on the project in late April.
M3 junction 9 compound work update:
- There will be temporary two-way traffic lights on Spitfire Link (A272).
- The lights will be operational after peak time traffic between 9.30am and 4pm on Friday 21 March 2025.
- To allow us to install this equipment, it will need to be under overnight closures and the current schedule is set out below (click on the links to see maps of the closures/diversions):
Overnight on Monday 17, Tuesday 18 and Wednesday 19 March
M3 northbound carriageway closed between junctions 9 and 8.
Diversion – Exit the M3 at the northbound junction 9 enter the A34 northbound to the A303 eastbound to re-join the M3 at junction 8 to continue your journey. M3 junction 9 to 8 northbound diversion
Overnight on Thursday 20 and Friday 21 March
M3 northbound carriageway closed between junctions 11 and 9.
Diversion – Exit the M3 at the northbound junction 11, use the A3090 then the B3040, the B3041, B3049, B3420, A34 eastbound to M3 junction 9 to continue your journey. M3 junction 11 to 9 northbound diversion
Overnight on Monday 24 and Tuesday 25 March
M3 southbound carriageway closed, between junctions 9 and 10.
Diversion – Exit the M3 at junction 9, use the A272 and A31 to M3 junction 10 to continue your journey. M3 junction 9 to 10 southbound diversion
Overnight on Wednesday 26, Thursday 27, and Friday 28 March
M3 southbound carriageway closed, between junctions 8 and 9.
Diversion – Exit the M3 at junction 8, use A303 westbound to the A34 southbound to junction 9 to continue your journey. M3 junction 8 to 9 southbound diversion
Overnight on Monday 31 March, Tuesday 1 April and Wednesday 2 April
Closure of the A34 southbound at Three Maids Hill and the A33 southbound the Cart and Horse junction.
Diversion – A34 and A33 southbound diversions
Overnight on Thursday 3 April
Closure of the A34 northbound from junction 9 to Three Maids Hill and the A33 northbound from junction 9 to the Cart and Horse junction.
Diversion – A34 and A33 northbound diversions
Our overnight closures will usually start from 8pm and finish by 6am but this can change depending on the volume of traffic and when we can close the road safely.
Our diversion routes are designed to suit all vehicle types.
We advise you not to use a Satnav when following any of our diversions because there is a risk it could direct you down an unsuitable road or back onto our network when it is closed.
Daytime works
We will continue to remove areas of topsoil and conduct archaeological surveys. These activities will take place away from the road, but you may see workers and machinery nearby.
Apologies for any inconvenience this may cause to your journey.
We also post updates through our south east X and Facebook social media accounts which you can share
Please note lane closure information is not usually provided on our 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.
Thank you
Kind regards
Kathryn Boyce
Customer and Communications Manager – M3 junction 9 improvements project
Working in partnership with National Highways
National Highways customer contact centre
0300 123 5000