Police and firefighters are working to clear up a large diesel spillage after a crash involving two lorries and a van on the M25.
It happened between junctions five and six and affected both sides of the carriageway.
The road was closed earlier but two lanes - one on either side - are now open while work continues to make the area safe. It is believed that no one is trapped.
The M25 in Essex is closed in both directions between J23 (A1) - J27 (M11) clockwise, and J27 (M11) - J25 (Cheshunt) anti clockwise. The carriageway may not fully reopen until 3pm.
A stretch of the M25 motorway is closed after one person died in a crash involving several vehicles.
A number of people were also taken to hospital following the accident, which happened at around 1.50am near Waltham Abbey.
The Highways Agency said the motorway is now closed between junctions 23 and 27 clockwise and anticlockwise between junctions 27 and 25. Some parts are expected to remain shut until 3pm.
It has led to long delays on the M25 and heavy traffic in surrounding areas.
Officers investigating a collision on the M25 that left a man with serious spinal injuries are appealing for witnesses to come forward.
The collision involved a black Range Rover Vogue and a blue Peugeot 206, and happened on the anticlockwise carriageway between Clacket Lane services and Junction 5 at about 2.50am on Monday 24 November.
The driver of the Peugeot – a man in his 20s, fractured his spine in two places and is currently being treated in hospital.
Anyone who witnessed the collision is asked to contact PC Steve Halliwell on 01622 798538 quoting reference 24-0069.
The controversial scheme for so-called 'Smart motorways' has already been in place on the M25 in Surrey for six months. Many motorists were against the idea of removing hard shoulders - saying they are vital for safety. So what effect has scrapping the lane actually had? Malcolm Shaw has been finding out.
It is now six months since a controversial scheme began to close sections of the hard shoulder on the M25 in Surrey. The Highways Agency says it's helping to ease traffic congestion on the motorway.
But many motorists were against the idea, saying the hard shoulder was vital for safety. So what effect has scrapping it actually had? Malcolm Shaw has been finding out.
There are massive jams on the M25 this afternoon as thousands head away for the Bank Holiday. Long queues mean delays on the entire southern section with two-hour delays from Dartford to Heathrow.
The junction around the M11 is badly hit as well.
Gridlock at the junction with the M3 means many drivers are diverting to the M4. It follows a slow start to the getaway earlier today.
It's a route used by more than a hundred thousand drivers a day. The Dartford Crossing is one of the biggest pinch-points for the south-east road network. Today the Government said it will do a detailed study of two final options for a new crossing over the Thames.
But some debate whether it's needed. David Johns reports, speaking to Roads Minister Robert Goodwill and Thurrock Council leader John Kent (Lab).
Two lanes are closed and traffic is queueing on the M25 clockwise between Clacket Lane Services and junction 6 A22/B2235 (Godstone) with congestion to junction 5 M26/A21 due to an accident involving two lorries and a car.