M25 Surrey crash snarls traffic to Gatwick and Heathrow

A serious collision on the M25 in Surrey has shut a busy stretch of the motorway between Junctions 10 and 11, triggering long queues and disrupting road access to both Gatwick and Heathrow airports at the start of the September travel period.

Key section of M25 closed after late-night collision

Publicly available information indicates that the crash occurred shortly before 11.50pm on Monday 31 August 2026 on the anticlockwise carriageway between Junction 11 at Chertsey and Junction 10 at Wisley. Reports describe a multi-vehicle incident involving a pedestrian, leading to a fatality and an extended closure of this section of the London orbital route.

According to published coverage, emergency response and collision investigation work kept the anticlockwise carriageway shut for several hours into Tuesday morning. Traffic data and live incident feeds show long tailbacks forming on the approach to the closure, with congestion feeding back towards Junction 13 for Staines and affecting link roads from the M3 and A3.

National Highways updates and independent traffic monitoring sites highlight that this corridor is already under pressure from ongoing improvement works around M25 Junction 10 and the A3 interchange. The sudden loss of capacity after the late-night crash further reduced options for drivers seeking to skirt southwest London, compounding the disruption during the early commuter peak.

While the affected carriageway has since reopened, residual delays persisted well beyond the morning rush as queues gradually cleared and displaced traffic filtered back onto normal routes.

Airport-bound drivers face missed flights and last-minute detours

The stretch of the M25 in Surrey functions as a vital link between the M3, A3 and M23 corridors, funnelling traffic towards both Heathrow to the northwest and Gatwick to the south. Government route-based strategy documents have previously highlighted the orbital motorway and the M23 spur as critical access routes for the two airports, which together handle hundreds of thousands of passengers per day.([assets.publishing.service.gov.uk](https://assets.publishing.service.gov.uk/media/5a7f0641ed915d74e6227f88/M25_to_Solent.pdf?utm_source=openai))

On Tuesday morning, that strategic role was visible in the pattern of delays. Journey planners and public traffic feeds showed substantially increased travel times on airport approaches, with drivers on the M25 anticlockwise towards Heathrow being diverted off at earlier junctions and re-routed through local A-roads already busy with commuter and school-run traffic.

For those heading to Gatwick, the disruption on the southwestern arc of the M25 rippled towards the M23 interchange near Merstham, where traffic is typically heavy at peak times. National travel advice in recent years has repeatedly urged passengers to build in additional time when relying on the M25 for airport trips, and Tuesday’s incident reinforced the risks of cutting it close.([en.wikipedia.org](https://en.wikipedia.org/wiki/M25_motorway?utm_source=openai))

Published coverage of the collision notes that some travellers missed early-morning flights or needed to rebook services after being caught in standstill queues. Others reported taking lengthy diversions via central London or alternative outer routes in an effort to bypass the blocked section of motorway.

Knock-on impact across Surrey’s road and rail network

The sudden closure of a key section of the M25 placed extra strain on an already busy regional transport network. The latest Surrey infrastructure studies and road-planning documents describe how incidents on the orbital motorway can quickly spill onto parallel A-roads and into town centres, as drivers seek alternative paths around blockages.([tandridge.gov.uk](https://www.tandridge.gov.uk/Portals/0/Documents/Planning%20and%20building/Planning%20strategies%20and%20policies/Local%20plan/Evidence%20base%20and%20technical%20studies/Surrey-Infrastructure-Study-%28January2016%29.pdf?utm_source=openai))

On Tuesday morning, mapping services showed heavy congestion on diversion routes via the A3, A245 and local roads around Byfleet, Woking and Cobham, as well as slower-than-usual traffic on the M3 towards Sunbury. Commuters heading from Surrey into London reported extended journey times, especially where local roads intersect with motorway slip roads close to the closure zone.

The disruption also coincided with separate issues on rail links toward Gatwick. National Rail reported delays between Guildford and Gatwick Airport on Wednesday 2 September because of a fault at a level crossing, with services between Reading and the airport facing hold-ups of up to 20 minutes and disruption expected into the evening.([nationalrail.co.uk](https://www.nationalrail.co.uk/service-disruptions/shalford-20260902/?utm_source=openai))

Although the road collision and the rail fault were unrelated, their combined effect underlined how fragile key access corridors to the two airports can be when multiple incidents occur in close succession.

Renewed scrutiny of resilience on the London orbital

The crash comes at a time when capacity and resilience on the M25 around Surrey are already under wider review. Ongoing major works at Junction 10, one of the busiest and historically most collision-prone interchanges on the network, have involved periodic weekend closures of the A3 and significant lane restrictions, with official updates acknowledging the risk of extended delays for drivers heading towards Heathrow and Gatwick.([nationalhighways.co.uk](https://nationalhighways.co.uk/roads-and-travel/road-projects/south-east/m25-junction-10/?utm_source=openai))

Previous government evidence reports have described the M25 and its connecting routes as essential not only for airport access but also for freight, commuting and long-distance travel across southeast England. These documents stress that incidents which close even short sections of the orbital can rapidly generate region-wide congestion, especially where there are limited high-capacity alternatives.([gov.uk](https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/364210/London_Orbital_and_M23_to_Gatwick.pdf?utm_source=openai))

Transport commentators quoted in recent coverage of the Surrey collision point to the timing of the crash, coming just as schools return and workplaces ramp up after the summer, as a reminder that demand on the orbital is rising after the quieter holiday weeks. The mix of commuter traffic, airport transfers and freight in early September can leave little room for the network to absorb a major incident without widespread knock-on effects.

Some analysts argue that the latest disruption will likely feed into ongoing debates about investment priorities, including whether further capacity improvements, smarter traffic management or stronger modal alternatives for airport trips should take precedence in the coming years.

Advice for upcoming journeys to Heathrow and Gatwick

Travel information providers continue to advise passengers with imminent flights to allow additional time when using the M25 in Surrey, particularly around the Junction 10 to Junction 13 corridor. Real-time traffic sites for the motorway show that incidents, roadworks and breakdowns are common features on this section, even on days without a major crash, and that journey times can fluctuate sharply within short windows.([m25traffic.co.uk](https://www.m25traffic.co.uk/roadworks/?utm_source=openai))

For Heathrow-bound road users, publicly available guidance suggests checking live updates for both the M25 and connecting routes such as the M3 and M4, as incidents on one corridor can quickly divert flows onto another. Drivers aiming for Gatwick are encouraged to monitor conditions not only on the M25 and M23, but also on alternative approaches via Guildford and Redhill, where rail engineering works and local road congestion can influence the best route to the airport.([nationalrail.co.uk](https://www.nationalrail.co.uk/engineering-works/guildford-redhill-gatwick-airport-20260913/?utm_source=openai))

Passenger groups and online travel forums regularly stress the importance of having a contingency plan, whether that involves an earlier departure, flexible ticketing, or the option to switch to rail if motorway conditions deteriorate. This week’s collision on the M25 in Surrey is likely to reinforce that message for many regular users of the London orbital and the two major airports it serves.

National Highways: M25 Junction 10 project and traffic updates

National Rail: live service disruption and airport route information

M25Traffic.co.uk: live M25 incidents and travel times

UK Government: London Orbital and M23 to Gatwick route strategy