From that list I've driven in Mexico City, NYC, DC and Toronto
I don't understand how Toronto can be higher in the list than NYC. I guess people here in Canada like to complain more.
Answering to "pgm554" Yes, we want to think that our pain is the worst, but having driven there and in those other cities, The beltway is a Sunday drive compared.
3 hour traffic jams in Mexico City is nothing rare, actually, most days are like that. A 45minute commute for a 10 KM drive? that's a normal drive to school.
NYC: 1.5 hours just to cross the Holland tunnel (in a good day).
As for Toronto? mostly when it rains or there is snow, I have no clue why people cannot drive under those normal conditions.