I-80. IL. Pick your time of year and there is always construction 'trying' to fix that road.
I-20 couple of years ago, out of Birmingham towards Atlanta at one time was SOOOOO washboardy I couldn't go over 40 miles an hour in the MH. And there were no roads you could get off on to get anywhere. :R Took it last year and they finally fixed it.
I-43 N. of Lake Geneva heading W. THE worst road I have ever been on. Washboard, up and down, banging the heck out of my MH.
Don't take much stock in that survey though. Chicago roads are no where's on that list. :W