I'm in KC pretty often and am surprised they get the #1 award. It may
have been because of the unusually bad first few miles of I-70 leaving
the city east to St. Louis. Both towns probably get more than their share
of traffic due to their central location.
KC is on the "Nafta Highway" where Mexican and Canadian goods are
transported in the US. I've heard that in N. Mexico/S. Texas there's a
area that has the greatest level of semi traffic in the world. The trucks load
up with goods from Mexico but they don't return empty, they return
filled with cash, government debt securities and credit card receipts to pay
for the next shipment.
