I would have bet on Pennsylvania being #1...certainly not #15. The interstates have been crap for DECADES! On a related note, wasn’t ‘The Road’ filmed in Pennsylvania? Case closed.
While living in the northeast, I drove a lot of roads in PA. Very bad roads. And the excuse that politicians gave was that the weather made it difficult to keep them in good shape.
I have also driven in Wisconsin. Nice roads there.
I live in PA and when we moved their 10 years ago from NJ, the roads were bad or far worse in PA....However, now when I go into NJ, their back roads are horrible. PA’s back roads are better but nothing to write home about.