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Four-Vehicle Collision Causes M40 Closure Near Gerrards Cross

Motorists travelling along the M40 in Buckinghamshire faced significant disruption on Monday morning, November 9, 2026, after a collision involving four vehicles prompted a temporary closure of the southbound carriageway.

The incident occurred near Gerrards Cross, between Junction 1A for the M25 and Junction 1 at Denham. The closure affected traffic heading towards London and resulted in substantial congestion, with delays reportedly reaching approximately 90 minutes.

Thames Valley Police attended the scene, while National Highways coordinated traffic management and helped release motorists who had become caught within the closure.

Police later confirmed that the collision resulted in minor injuries. The motorway subsequently reopened, allowing traffic to begin moving again.

What Happened on the M40?

The collision was reported during the morning rush hour on Monday, November 9.

According to traffic updates, the incident involved four vehicles on the M40 southbound near Junction 1A, close to the motorway’s connection with the M25.

The circumstances leading to the collision have not been fully disclosed. Authorities have not publicly established what caused the vehicles to collide.

Thames Valley Police attended the incident, and the motorway was temporarily closed while emergency services dealt with the situation.

M40 Southbound Closed Between Junction 1A and Junction 1

The closure affected the southbound section between Junction 1A and Junction 1.

National Highways advised motorists that the closure was necessary while police-led operations continued.

Traffic caught between the closure points was gradually released from the rear of the incident. However, vehicles approaching the affected stretch experienced considerable delays.

Congestion reportedly extended for several miles, affecting motorists travelling through Gerrards Cross, Beaconsfield and surrounding areas.

Drivers Face 90-Minute Delays

The disruption created difficult conditions for commuters and other road users travelling towards London.

At the height of the incident, delays were estimated at approximately 90 minutes, with queues stretching for around four miles.

Drivers were advised to avoid the affected section where possible and allow additional time for their journeys.

The incident also placed pressure on nearby roads as motorists attempted to find alternative routes around the closure.

Police Confirm Minor Injuries

Thames Valley Police later confirmed that the collision was a minor-injury incident.

Although four vehicles were involved, authorities did not report any fatalities in the updates available at the time of publication.

Further details about the people involved, the number of injured individuals and the precise circumstances of the collision had not been publicly established.

The incident remains separate from any other reported motorway disruption, and motorists should rely on official updates for confirmed information.

M40 Reopens After Morning Collision

National Highways confirmed that the southbound carriageway had reopened at approximately 9:32 a.m. on November 9.

Traffic conditions subsequently began improving, although residual congestion remained as vehicles moved away from the affected area.

The reopening brought an end to the major motorway closure, allowing journeys towards London to resume.

Motorists were nevertheless advised to remain cautious and check traffic conditions before travelling.

M40 Accident: Key Details

Investigation and Further Updates

The precise cause of the four-vehicle collision has not been confirmed in the information available.

Police and relevant authorities may make further information available if additional details emerge from their enquiries.

Drivers who regularly use the M40 should continue checking National Highways traffic updates, particularly when travelling through the Buckinghamshire section towards London.

Disclaimer

This report is based on traffic and police updates available on November 9, 2026. The collision involved four vehicles, and police described it as a minor-injury incident. The exact cause, identities of those involved and full injury details have not been independently established in this report. Information may change if authorities release further updates.

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