M25 Junction 10/A3 closures: Fresh set of closures confirmed as completion date for project is pushed back
The dates for more closures in the M25 and A3 have been announced as the multi-million project to create a new junction nears completion.
Work has ben ongoing for some time at the junction - said to be the busiest interchange in the country - which is used by Hampshire drivers heading towards London and further north.
The slip roads from junction 10 of the M25 where it meets the A3 will close between February 21 and 24, coinciding with the end of half term, with the A3 itself closed in April. On top of this the M25 will be closed for two full weekends in March to allow for old bridges over the carriageway to be demolished and removed.
The dates for the next major road closures are:
- Slip roads from M25 Junction 10 (where it meets the A3) closed between February 21-24
- M25 closed at junction 10 from 9pm on Friday, March 7 to 6am on Monday, March 10
- M25 closed at junction 10 from 9pm Friday, March 21 to 6am on Monday, March 24
- A3 closed in both directions at M25 Junction 10 and Cobham Roundabout/A245 between April 11-14.
Concertgoers, sports fans and holidaymakers travelling to London and surrounding areas are among those urged to plan their journeys well in advance and ensure they allow extra time or make alternative travel arrangements.
Jonathan Wade, National Highways senior project manager, said: “This is the final block of closures on the M25 as this scheme nears completion.
“We were grateful to drivers who listened to our advice during the three weekend closures last year and I’d again urge them to only use the motorway if their journey is absolutely necessary.
“Unfortunately, it’s simply not possible to carry out this scale of infrastructure improvement, which will benefit millions of people in the long term, without there being some degree of short-term disruption.
“We have spent months planning these closures, but they will still cause significant congestion and delays, so we are asking road users to allow extra time and use alternative routes where possible. Please follow our official diversion routes and not information from satnavs.”
As part of the scheme National Highways has already opened the new Wisley Lane and installed several structures which will offer safe passage for pedestrians, cyclists and horse-riders over the motorway. Jet lanes are also now carrying traffic through the junction while avoiding traffic signals.
While the fundamental elements of the scheme which affect drivers day-to-day are still expected to be finished this summer, the final completion date for the project has now been moved back to spring 2026 after poor weather delayed the original timetable.
Mr Wade added: “Periods of extreme weather in 2024 delayed some elements of our work but since then we’ve worked hard to recoup that time and still complete the on-road elements on schedule.
“We are already seeing some of the benefits of this project, which will help reduce congestion, create a smoother flow of traffic and provide safer journeys for thousands every day.”
Diversion routes for each of the upcoming closures will be announced and published closer to each weekend.