A section of Britain's busiest motorway has had to be closed for the second time in three days - again due to a serious accident.
The Highways Agency is starting initial work on an upgrade to the M25 between Kent and Surrey.
Two widening schemes on Britain's busiest motorway were completed today after three years of work.
The Highways Agency says the closed section of the 25 is likely to stay shut for most of the day. Motorists are being asked to consider alternative routes.
Stuck on the m25 for an hour and hardly moving! Grrrrrrrr!
As soon as I get off this m25 I'm getting McDonald's!!! #stressed!!! ??
The fact that we could be stuck on the m25 for 3 hours makes me want to cry
M25 both ways closed, severe delays due to overturned lorry between J23 (St Albans Road) and J25 (Enfield), congestion on Clockwise to J22 A1081 (St Albans / London Colney) and on Anticlockwise to J27 M11.
The emergency services are still on the scene and the two air ambulances have left.
DIVERSION: clockwise follow the 'Hollow Triangle symbol' , anticlockwise the Hollow Square Symbol- via the A1, A406, and A10
One man is in a critical condition and another is being treated for serious injuries after a lorry overturned on the M25 this morning.
Emergency services and the London Air Ambulance were called to the stretch of road between junction 24 and 25 at around 9:30am.
The motorway is currently closed in both directions.
The Highways Agency says there are long delays on the M25 tonight after lorry overturned and caught fire at junction 25 (Enfield). All lanes have reopened clockwise, but traffic is tailing back to junction 21a (M1 junction).
The Highways Agency has confirmed that all lanes of the M25 have reopened clockwise between junction 23 and junction 25. However, the exit slip road at junction 25 remains closed.
Keep well clear of the M25 by south mimms. I've not moved for an hour and half.
The Highways Agency says it expects the M25 to remain closed into the evening rush hour. Hundreds of cars are which are trapped in the closure between junctions 23 and 25 are gradually being released.