Drivers planning to use the A3 this weekend face further disruption as National Highways continues its major improvement works at the M25 Junction 10 (Wisley Interchange). Several full weekend closures have been scheduled through to September 2025, affecting a key stretch between the M25 and the A245 at Painshill roundabout near Cobham.
These closures are part of a long-term scheme to reduce congestion and improve safety at one of the South East’s busiest junctions. This guide covers the latest confirmed dates, explains the official diversion routes, and clarifies what travellers can expect.
If you are driving this weekend, it is worth checking the status of your route before setting off. While these closures are planned well in advance, unplanned incidents can also cause disruption at any time.
Is the A3 Closed This Weekend?
Yes, for several weekends during summer 2025, the A3 is closed in both directions between the M25 Junction 10 (Wisley Interchange) and the A245 Painshill roundabout in Cobham. The closures run from 9pm on Friday until 6am on Monday. This is a significant stretch of road and drivers should expect delays and should plan an alternative route.
Quick Overview: A3 Closures This Weekend
The confirmed weekend closures for July to September 2025 affect the A3 near M25 J10 (Wisley). Each closure typically lasts 56 hours and a signed diversion route is in place.
Closure Status: Confirmed. The A3 is closed between M25 J10 and A245 Painshill.
Dates & Times: 9pm Friday to 6am Monday (subject to change).
Affected Junction: M25 Junction 10 (Wisley Interchange).
Key Diversion: A245 / M25 / A3 via local roads.
Here are the key insights to understand about these closures:
- The A3 weekend closures are part of the M25 Junction 10 improvement scheme (Wisley Interchange).
- All closures are scheduled far in advance to allow for summer journey planning.
- The closures apply to both directions of the A3.
- The most common reason for the closure is the construction of a new Wisley interchange.
- Official information is published by National Highways on their project page and road closure report.
| Fact | Detail |
|---|---|
| Location | A3 between M25 J10 and A245 Painshill interchange. |
| Direction | Both directions closed. |
| Typical Duration | 9pm Friday to 6am Monday (56 hours). |
| Upcoming Dates | July 18-21, August 1-4, September 12-15. |
| Reason | M25 Junction 10 improvement (construction of new Wisley interchange). |
| Official Source | National Highways. |
What Are the Exact A3 Closure Dates This Weekend?
National Highways has confirmed specific dates for the upcoming weekend closures. These are the most relevant dates for summer 2025.
July 18-21, 2025: Full weekend closure from 9pm Friday to 6am Monday.
August 1-4, 2025: Another full weekend closure. National Highways says the A3 will close in both directions between Junction 10 Wisley Interchange and the B2215/A247 at Send from 9pm Friday until 6am Monday for gantry installation and resurfacing.
September 12-15, 2025: Full weekend closure from 9pm Friday to 6am Monday.
Duration of Closure
The road is typically closed for 56 hours from Friday evening to Monday morning. Exact start and end times could vary slightly due to weather or operational delays. Emergency or unplanned closures may occur outside of this schedule and are not predictable.
Earlier closures in 2025 have already taken place, including a closure from June 20-23, 2025 and another from July 4-7, 2025. There was also a closure of the slip roads at Wisley interchange from May 16-19, 2025, though the A3 and M25 remained open during that period.
Where Is the A3 Closed? (Location and Map Guide)
The closures are specifically located on the A3 in Surrey, near the M25 Junction 10 (Wisley Interchange). This is a section of the A3 that runs between the M25 and the A245 at Painshill roundabout in Cobham.
Is the A3 closed near London this weekend?
Yes. The affected section of the A3 is within the Greater London area, approximately 20 miles southwest of central London. It is a major route for traffic heading to and from the capital, particularly for drivers using the M25.
Is the A3 closed near Manchester this weekend?
No. The A3 runs in South East England, from London to Portsmouth. Queries about the A3 near Manchester are geographically invalid. The A3 does not extend to Manchester. Drivers in the Manchester area should check for closures on the M6, M56, or A556.
Will the M25 be closed near the A3 this weekend?
The M25 at junction 10 may have lane closures or reduced speeds while the A3 is closed. However, the main carriageway of the M25 typically remains open. For specific M25 closures, it is best to check the National Highways road closure report.
National Highways provides a detailed closure report and map on their travel updates page. The exact map image is not always publicly available in text results, but the page offers a clear geographic description of the affected area.
What Is the Diversion Route for the A3 Closure?
National Highways has a signed diversion route in place for drivers who need to travel through the area during the closures. The route is designed for the A3 northbound closure from M25 J10 to Painshill. It uses local roads and other major routes.
Northbound Diversion (A3 to M25): Leave the A3 at Send interchange. Take the A247 southbound to Clandon crossroads. Then take the A246 eastbound to Givons Grove Roundabout. Follow the A24 eastbound toward M25 J9. Take the A243 northbound to Hook. Use the A309 westbound (Kingston Bypass) to Scilly Isles Roundabout. Go southbound on the A307 to Cobham. Finally, take the A245 westbound to Painshill.
Traffic from the M25: For traffic that has to be diverted from the M25 because of the A3 closure, National Highways routes traffic via the eastbound M25 to Junction 9, then follows the same signed route from the A243 onward.
Traffic Impact Warning
Expect significant delays, especially around M25 J10 and local diversion routes (A245). Using alternative routes is strongly advised. Delays are expected on all approaches to the closure, including the M25 itself, as local roads absorb diverted traffic.
Timeline of Confirmed A3 Weekend Closures (2025)
National Highways announced all three summer weekend closures in advance to help people plan their journeys. The following list shows the confirmed dates for 2025.
- July 18-21, 2025: Full weekend closure (Fri 9pm – Mon 6am).
- August 1-4, 2025: Full weekend closure (Fri 9pm – Mon 6am).
- September 12-15, 2025: Full weekend closure (Fri 9pm – Mon 6am).
These are the confirmed closures listed by National Highways for the summer period. Additional closures may be added or cancelled. Check the official road closure report for real-time updates.
Planned vs. Unplanned Closures: What You Need to Know
Understanding the difference between planned and unplanned closures helps with journey planning. The table below separates what is established from what remains uncertain.
| Established Information | Information That Remains Unclear |
|---|---|
| Three full weekend closures for July-September 2025 are confirmed by National Highways. | Exact start and end times could vary slightly due to weather or operational delays. |
| Closures are for planned roadworks at M25 J10/A3 Wisley Interchange. | Emergency or unplanned closures may occur outside of this schedule and are not predictable. |
| The A3 does not go near Manchester. | Queries for ‘A3 closures near Manchester’ likely refer to a different road (e.g., M6, M56, or A556) and should be clarified. |
Why Are There So Many A3 Closures?
The M25 Junction 10/A3 Wisley interchange improvement scheme is a major infrastructure project aimed at reducing congestion and improving safety. These weekend closures are necessary to safely carry out construction work that cannot be done with traffic flowing. The project is managed by National Highways and is part of a wider program of motorway and A-road upgrades in the South East.
The A3 weekend closure June and July 2025 information provides further context for those affected by the earlier closures. The M25 junction 10 project profile outlines the full scope of the works.
What Do Official Sources Say?
National Highways is the primary source of information for these closures. The following quotes are taken from official public channels.
“To help people plan their summer journeys, we’re announcing all confirmed A3 weekend closures through to September in one go.”
— National Highways (South East)
“Advance notification of full closures on England’s motorways and major A roads.”
— National Highways Road Closure Report
“Diversions are in place and delays are expected.”
Further updates are also available from the National Highways South East Facebook page and from travel information sites such as Disabled Motoring.
What Happens After the Weekend Closure?
Once the weekend closure ends, the A3 is scheduled to reopen by 6am on Monday. Following the September 2025 closures, the project is due for completion in spring 2026, according to National Highways. Drivers should continue to check the National Highways closure report for real-time updates before traveling.
You can sign up for email alerts from National Highways for future A3 and M25 closures.
Frequently Asked Questions About A3 Closures
What are the A3 closure dates for 2025?
Confirmed closures: July 18-21, August 1-4, September 12-15. Check National Highways for updates.
How long will the A3 be closed this weekend?
Typically from 9pm Friday to 6am Monday (56 hours).
What is the impact of the A3 closure on traffic?
Expect significant delays, especially around M25 J10 and local diversion routes (A245). Using alternative routes is strongly advised.
Where can I find a map of A3 closures this weekend?
National Highways provides a detailed closure report and map on their travel updates page.
Will the M25 be closed near the A3 this weekend?
The M25 at junction 10 may have lane closures or reduced speeds, but the main carriageway is typically open. Check National Highways for specific M25 closures.
Is the A3 closed near Manchester this weekend?
No. The A3 runs in South East England (London to Portsmouth). Queries about ‘A3 near Manchester’ likely refer to other roads. Check M6, M56, or A556 for closures near Manchester.
Why is the A3 closed this weekend?
The closure is for the M25 Junction 10 improvement scheme, which involves construction of a new Wisley interchange to reduce congestion and improve safety.
Oliver Arthur Morgan Harrison is a staff writer for StoryShift.uk, covering UK news, culture, politics and technology. He works under Editor-in-Chief Maarika Tamm and UK Managing Editor Oliver Grant, following the newsroom standards for sourcing, verification and fact-checking set out in our editorial policies.