Indiana Tollroad is way better than I-94 across Michigan. We traveled from northern Illinois in May and used I-94 as the shortest way to Detroit. We had a terribly bumpy ride despite slowing down to 50 mph. When we returned to Illinois we headed south on I-75 out of Detroit to the Indiana toll road to avoid 94. There are tolls, but the ride was so much better. When we got home we discovered the rear suspension airbags were displaced and now have expensive repairs to look forward to.
Just in passing, the Henry Ford Museum and Greenfield Village was great, and the Edsel Ford Estate was well worth seeing. There is a lot to see and do in the Detroit area.
2006 Itasca Cambria 26A