Update: 1235 hrs
POLICE are advising motorists to avoid the M25 following a collision anti-clockwise between junctions 28 and 27.
A collision between a motorcycle and an articulated lorry occurred just before 7.30am this morning, Thursday, July 18.
The road was closed in both directions to allow landing of the air ambulance. The motorcyclist was air lifted to the Royal London hospital with serious injuries.
The clockwise carriageway is now open, as is one lane of the anti-clockwise track.
Officers are working as quickly as possible to open the rest of the road, however motorists are advised to avoid the area and find alternative routes.
M25 Greater London – M25 closed, severe delays and queueing traffic anticlockwise between J28, A12 (Brook Street Roundabout) and J27 M11, because of accident investigation work.
Diversion in operation – via the Hollow Square signs, south down the A12 to the North Circular, and north back up the M11.
Congestion to J30, A13 (Lakeside).