There are reports this evening of traffic stretching up to 50 miles on the M25 in Surrey.
Delays are anticlockwise between J20 and J6, with travel time more than three hours.
Many of those stuck have taken to Twitter, including cage fighter Alex Reid:
I love traffic and I love the M25 more! Arrrrrrrrh! http://t.co/Lkz3Kaa8Tr
Stuck in car park known as the m25 @sloughsynchro
I hate the M25. Might as well be a car park #justsaying