CanHighways.com
- Organized by state or province.
- http://www.canhighways.com/

State Line Signs
- Includes personally-taken examples from both U.S. states and Canadian provinces.
- http://www.johnweeks.com/stuff/states.html

The Chris Kadlec Road Photos Gallery
- Various views from trips around the continent.
- http://www.beaglebass.com/roads/

Roadfan.com
- The Lincoln Highway, the National Road, eastern Canada, and the Lower Mississippi River, Great Lakes, and New England areas in the United States.
- http://www.roadfan.com/

Piehl Canada Trip
- U.S. and Canada coverage from a 2002 road trip.
- http://webpages.charter.net/rpiehl5/main

Gribblenation.com
- Extensive information primarily covering the eastern third of the continent.
- http://www.gribblenation.com/

Why Do You Have So Many Pictures of Road Signs?
- Extensive U.S. and Canada coverage.
- http://www.teresco.org/pics/signs/

Alps' Roads
- Various locations in the U.S. and Canada.
- http://web.mit.edu/smalpert/www/roads/