The transition corridor thru the Chicago area is in horrible condition, pot holes you could bury a wash tub in. That has to be the roughest major highway in America. I shouldn't call it a highway,...
It's my opinion that all interstate highways are in terrible shape. I've driven I-80, I-90, I-40, I-25, I-5, I-10, I-20 and I-35. They are all rough and provide terrible rides, especially towing a 5ver.