The M25 has now reopened in both directions between Junction 10 at Wisley and Junction 11 at Chertsey following a fatal overnight collision.
Surrey Police confirmed that officers were called shortly before 11.50pm on Monday after a collision involving a pedestrian and multiple vehicles on the anti-clockwise carriageway.
An 18-year-old man was pronounced dead at the scene. His next of kin have been informed. Police said no arrests have been made and enquiries are continuing to establish the circumstances leading up to the collision.
Both carriageways of the M25 and the A245 Parvis Road, which were closed during the investigation, have since reopened.
Surrey Police are appealing for witnesses and anyone with relevant CCTV, dashcam or helmet-camera footage to contact officers, quoting reference PR/45260106054.
The M25 remains closed anti-clockwise between Junction 11 at Chertsey and Junction 10 at Wisley after a serious overnight crash in Surrey, causing major disruption during Tuesday morning’s rush hour. Drivers are being diverted through local roads, while passengers heading to Heathrow and Gatwick airports have been warned to allow extra time.
The collision happened shortly before midnight on Monday, August 31. The motorway was initially closed in both directions between J10 and J11 while emergency services attended and Surrey Police carried out an investigation.
The clockwise carriageway later reopened, but the anti-clockwise stretch from J11 towards J10 remained shut through the morning peak on September 1. National Highways said police completed their investigation at about 6am, but clearing the scene was expected to take several more hours.
Which part of the M25 is closed today?
The continuing closure affects the M25 anti-clockwise between Junction 11 at Chertsey and Junction 10 at Wisley.
J10 is a major interchange connecting the M25 with the A3, while J11 serves Chertsey and nearby communities. The location means disruption can quickly spread beyond the motorway and onto roads around Woking, Byfleet, Cobham and Ottershaw.
Surrey Police advised motorists to avoid the J10-J11 area and use the official diversion because substantial queues were expected.
How bad are the M25 traffic delays?
Traffic reports indicated congestion stretching towards Junction 13 at Staines, meaning motorists approaching from the Heathrow side could face delays well before reaching the actual closure.
The impact is also being felt on local routes as traffic that would normally remain on the M25 is redirected through Surrey. That can create slower journeys even for drivers who are not planning to use the closed section.
The A245 Parvis Road was also reported closed in both directions, adding another complication for people looking for alternative routes.
What is the M25 diversion route?
Drivers travelling anti-clockwise are being directed to follow the signed Hollow Square diversion.
Motorists should leave the M25 at Junction 11, follow the A320 through the Woking and Ottershaw area, then use the A245 towards Cobham. Traffic can then join the A3 before reconnecting with the M25 at Junction 10.
Drivers are advised to follow the official road signs rather than relying entirely on sat-nav shortcuts, as smaller roads around the diversion can quickly become congested.
BREAKING
— GB News (@GBNEWS) September 1, 2026
M25 traffic: Motorway shut after serious collision as police issue urgent Heathrow and Gatwick warninghttps://t.co/am12F6dmck
Heathrow and Gatwick passengers warned
Surrey Police specifically warned people travelling to Heathrow and Gatwick airports to check journey times before leaving home.
Heathrow-bound traffic could be affected by queues stretching back towards Staines, while Gatwick passengers travelling through Surrey may encounter delays on both the M25 and surrounding diversion routes.
Passengers with flights should allow additional time. Even after the motorway reopens, traffic built up during a long closure can take time to clear.
When will M25 J10-J11 reopen?
No firm reopening time had been confirmed during the morning.
National Highways said the police investigation finished at approximately 6am, but the scene still needed to be cleared before the motorway could reopen safely.
That work can include vehicle recovery, removing debris and checking the carriageway before traffic is allowed back onto the road.
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What is known about the crash?
Authorities have described the incident as a serious collision. However, the information released so far has not confirmed the cause, number of vehicles involved or details of any injuries.
Those facts should not be inferred from the length of the closure. Drivers should rely on official police updates rather than unverified information circulating online.
Why the closure matters beyond J10-J11
The timing has placed the incident directly across one of the busiest parts of the morning travel period, affecting commuters, freight traffic and airport passengers around London’s orbital motorway.
Serious incidents on major UK routes can create disruption far beyond the immediate crash scene. A recent M6 incident near Junction 34 similarly showed how motorway problems can quickly affect surrounding roads.
The A66 crash near Middlesbrough is another example of how major-road closures can produce wider delays and force motorists onto alternative routes.
Anyone travelling through Surrey should check the latest road conditions immediately before setting off. The key developments now are confirmation of the motorway reopening and any further verified information from Surrey Police about the collision.
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