AboutVia: Uses a Yahoo/DMOZ format.
Andy's Highway Kickoff Page: Large list with annotations.
California Highways: Other Links: Links to resources covering many countries.
Nationwide Interstate Links: Connects to the respective Interstate portions of other websites.
Roadfan Locator: Listing of people interested in the subject, with contact information. Organized by geographic area.
Tony's Exit List Collection: Contains exit lists for all 2-digit and most 3-digit Interstates, sorted by state and/or city.