I'll be traveling from St. Louis to Greebay in late May. (Part of a Texas - Canada ride.) Can someone advise me of some good secondary north-south roads near the straight line between these cities? So far, I've only got a short bit of nice road just north of Peoria, Hwy 24 I think. Any other suggestions? How heavy is the interstate traffic in the Rockford, Ill and say within 100 miles of Green Bay?

Thanks!