Highway Heaven by Michael Adams. Unofficial Minnesota Highways Page by Steve Riner. Steve runs the main pages on Minnesota highways. While I have the actual Exit Lists for the Twin Cities, Steve has a route log with pages on the actual routes themselves, including history and termini. Upper Midwest Freeway Exit Guides by Matt Salek.
Covers outstate Minnesota, as well as western Wisconsin and northern Iowa.
Freeways of the Deep South by me. Freeway exit lists for Mississippi, Alabama, Louisiana, and Tennessee. Fictional Freeways also by me. My main roads and highways site.