M25 Junction A3 Closures This Weekend Map

So, you’ve heard the news: the M25 Junction A3 is shutting down this weekend. And your first thought is probably, “Oh brilliant, just what my Saturday needed—a giant, tarmac-based headache.” I hear you. It’s like the universe decided your weekend needed a dash of organised chaos.

But relax. We’re going to get through this together, preferably without you yelling at your sat-nav. The key is knowing exactly where that closure is and what little map-shaped miracle will save your bacon.

The Big Picture: What’s Actually Happening?

Here’s the deal: National Highways is closing a chunk of the M25 near Junction 3 (the A3 interchange) from Friday night until Monday morning. Think of it as the road going on a little spa weekend—except instead of cucumber water, it’s getting fresh tarmac and white lines.

This is the second closure in a massive £317 million upgrade to the junction. Yes, you read that right—£317 million. That’s enough to buy every person in Surrey a slightly fancy sandwich, but instead, they’re fixing our traffic. Priorities, people!

The closure runs from 10pm on Friday 14 March to 6am on Monday 17 March 2025. So if you were planning a romantic drive around the M25 at midnight on Saturday… maybe reschedule that date.

Where Exactly Is the Map?

Right, let’s talk about the map—because I know you’re scrolling on your phone right now, squinting at little blue lines. The closure affects both carriageways of the M25 between Junction 10 (A3 Wisley Interchange) and Junction 11 (A320 St Peter’s Way).

I know, it sounds like a secret code from a spy movie. But in plain English: if you’re driving between Wisley and Chertsey, you’re in the danger zone. The actual closed section is about nine miles long, but the knock-on effects are bigger than your auntie’s handbag at a wedding.

National Highways has released an official “diversion route map” that looks like a toddler’s drawing of spaghetti. But don’t panic—I’ve decoded it for you.

The Diversion: Your New Best Friend

Okay, here’s the official diversion. It’s not complicated, I promise. You’ll be using the A3, the A245, and the A320. Think of them as a little family of roads holding hands to help you through.

Full 20-mile A3 diversion route ahead of full weekend closure near M25

If you’re heading clockwise (northbound), exit at Junction 10, drive north on the A3 to the A245 at Burpham, then follow the A245 to the A320 at Woking. Then hop back onto the M25 at Junction 11. Easy, right? Right?

If you’re heading anticlockwise (southbound), do that whole thing in reverse. It’s like a driving palindrome—satisfying in theory, but slightly sweaty in practice. The official word is to allow extra 30 to 45 minutes for your journey. Or, you know, pack snacks and a playlist.

What About the Local Roads?

Here’s where it gets tasty. The diversion sends thousands of cars through Byfleet, West Byfleet, and Woking. That’s right—you’re going to see more roundabouts than you’ve ever seen in your life. Byfleet alone has about twelve (I counted on a map once).

Locals are already sharpening their elbows for the fight to get onto the A245. If you see someone in a Land Rover doing a four-point turn… just smile and wave. This is their village now, and you’re just visiting.

Be warned: sat-navs will try to “help” by sending you down tiny country lanes. Do not listen to the robot voice when it whispers, “Turn left onto a dirt track called ‘Sheep’s Bottom’.” Stick to the official diversion. Trust me on this one.

Tips to Survive (and Maybe Even Enjoy) the Chaos

First tip: leave earlier than you think you need to. If you think you need to leave at 10am, leave at 9.30am. That extra half-hour is your buffer against existential despair.

Drivers to be affected as M25 section to close this weekend | Autocar

Second tip: pack a thermos of tea and some biscuits. Yes, I’m serious. There’s something deeply British about sipping Earl Grey while stationary on the A245. It turns a traffic jam into a moving (or not-moving) picnic.

Third tip: avoid the area entirely if you can. Work from home. Watch that TV series you’ve been saving. Go for a walk. The M25 will still be there on Monday, probably with a fresh glow and a new sense of purpose.

And finally: download the official National Highways map before you leave. The PDF version is free, and it’s like having a paper towrope in a digital world. You can find it on their website under “M25 J10 to J11 closure.”

The Silver Lining

Look, I know the words “weekend closure” and “M25” sound about as fun as a dental appointment. But think of this: they’re fixing the junction so it doesn’t break every single weekend forever. This pain now is for pleasure later.

When the upgrade is complete, the junction will have more lanes, better slip roads, and less weaving. Future you will zoom through here and think, “Wow, I’m so glad 2025 me put up with that one awful weekend.” You’ll be a legend in your own car.

So pack your patience, set your sat-nav, and remember: you are not alone. Thousands of your fellow humans are all collectively sighing on the same diversion. Wave at them. Share a biscuit—virtually. This too shall pass, and probably with less honking than you expect.

And when you finally reach your destination—whether it’s your sofa or a seaside B&B—you’ll feel a glow of achievement that no smooth motorway ever gave you. You survived the M25 closure. You are officially a traffic warrior. Now go have that cup of tea. You’ve earned it. 🚗☕