:B Surprise! Welcome to Indiana!
Really... I've been attempting to warn everyone about the interstates in Indiana for years now. Of course, if you are towing anything, you REALLY feel the bumps and cracks, not to mention those sections where they finally got everything NICE and SMOOTH, and 6 months later, dig it all up!
I-75 from Indy to Cincy, I-69 from Indy to Ft. Wayne. I-65...the entire length! I-70, especially between Indy and Richmond, and Richmond area is horrible.
Considering I live in Indiana, When traveling anywhere in the state, I avoid interstates as much as possible because of both the speed demons and the rough roads.
If you had opportunity to get off the interstates, you'd find the secondary roads (highways) are much better, and... believe it or not ... the county roads are smoother than the interstates!
I live on a county road and it makes interstates look sick! (well, they are!).
Nice alternatives, if you don't mind a slower pace is US 40 (East-West) and US 31 (North South), Highway 3, 1, (North South), Highway 28, East-West. Basically, anything but interstates!
What's really bad though, as soon as they get a section of the interstate re-paved, they dig it up again, almost immediately, and then leave horrid bumps! Awful... simply awful!
But ... now you know better! (Take the secondary roads! There's a LOT of very interesting things to see when you get off the interstates anyway!)