Drivers have been asked to avoid a section of the M25 after a “serious collision”.
Essex Police were called to the anti-clockwise carriageway of the M25 between junction 27, near Epping, and 28, near Brentwood.
It was reported the accident occurred at 11.10am this morning before junction 27 on the M11.
All traffic is being temporarily held as a result of the incident with congestion carnage estimated to last hours.
A police spokesperson said: “There is significant disruption in the area and we are expecting this to continue for a number of hours with possible road closures on both carriageways.”
The force has advised drivers to plan alternative routes.