Of what? :-)
Notice, when you leave Chicago headed West, there is a small sign there not very conspicuous, right as you leave Aurora that says. Hope you have your lunch with you, in the next 2000 miles someone May, or May Not, know how to burn a steak!
Oh, BTW, I left out NDAK, an obvious TBA, and Michigan, which you might want a summer house in on a lake, if you like to make an annual blood donation to the state's legendary billions of mosquitoes, which it does nothing about. In Florida, we CONTROL the little suckers.