Major Multi-Vehicle Collision Shuts Down M25 in Both Directions

A major crash involving two lorries has forced the closure of the M25 motorway in both directions this morning (24 February 2026), causing severe traffic delays around London, authorities and traffic monitors report.

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Emergency services are on site managing the scene, and drivers are advised to avoid the area.

The collision occurred between Junction 28 (South Mimms) and Junction 27 (Potters Bar) on the northbound and southbound carriageways.

Reports indicate that one of the lorries collided with a nearby power line, exacerbating the disruption and prompting safety concerns over live electrical wires.

All affected lanes remain closed while emergency crews, including police, fire services, and highway authorities, work to clear the vehicles, remove debris, and secure the area.

Commuters are experiencing hour-long delays, and congestion has extended onto surrounding roads, including the A1(M) and local feeder routes.

Safety Measures and Traffic Advice

• Motorists are urged to avoid the affected stretch of the M25 until the scene is cleared.
• Diversion routes via A1(M) and local motorways are recommended.
• Drivers approaching the area should reduce speed and comply with emergency personnel instructions.
• Delays are expected to persist for several hours as the investigation and clearance continue.

Highways England confirmed that all emergency response units are working to reopen the carriageway safely, and drivers should expect ongoing congestion throughout the day.

The M25 is London’s busiest orbital motorway, linking multiple major motorways, including the M1, M4, and M11.

Even a single-vehicle incident on this route can cause massive gridlock, but a dual-direction closure due to a lorry crash and downed power line significantly increases the risk of secondary accidents and delays.

Commuters are advised to plan alternative routes, leave early, or delay travel if possible, particularly those heading toward London from Hertfordshire, Enfield, or surrounding areas.

Multi-vehicle collisions, especially involving heavy vehicles, continue to present serious risks on high-speed motorways.

Overspeeding, driver fatigue, or distracted driving are often contributing factors.

RoadKing.ng reminds drivers to:

• Maintain safe following distances
• Avoid distractions while driving
• Observe posted speed limits
• Be vigilant in areas with high truck traffic

Emergency and highway authorities have urged all road users to stay alert and follow diversion signage to prevent further accidents.