I raced an on road Nitro a couple times as RSJ raceway but it was a long time ago and they probably changed things around a lot siince then. Other than that I raced on road electric. I know there is a very large group of people that run at chicago RC that talk all the time on radiocontrolzone.com but don't even bother trying to talk about off roads there. Its not part of their vocabulary.

http://www.chicagolandrc.com

check at chicagorc.com they have a good listing of on road tracks there.