Beijing

[MOCAŠ]

What's the worst traffic jam you've ever been in? This one apparently stretches for 60 miles and has been going on for 10 days now... and it's not over yet.

China Traffic Jam Could Last Into September - WSJ.com

 

[Chattonmill]

I wasn't in it, but in the early 90's the French truckers had a bit of a strike and blocked the motorways. I was travelling in the opposite direction but the road was blocked from Moutiers way past Albertville.
That lasted a few days if I remember, complete standstill!