The M25 is now only closed clockwise between J5 (A21, Chipstead) and J6 (Godstone) due to the serious collision.
Kent Police are still at the scene, according to Highways England.
Traffic officers from the government agency are helping to manage vehicles.
Motorists affected by the closure are travelling past the scene in lane one, according to Highways England.
The M26 has been closed westbound between J3 and the M25. Traffic is being diverted up the M20.
There are 60 minute delays clockwise and 120 min delays anti-clockwise.