Traffic is stuck in a 13 mile queue on the M25 between Waltham Abbey and Enfield because of an accident between two lorries, a fuel spillage and recovery work.
Two lanes are closed anticlockwise between Junction 25 and 26 and cars are now stretching one mile beyond Junction 28.
Travel time is estimated at two hours.
More top news
David Cameron unexpectedly appeared during a cookery segment.
Robert Quick, who was head of special operations for Scotland Yard questioned whether the Government should lay on charter flights.
Negotiators from the three unions have agreed to meet London Underground managers at the conciliation service ACAS.