AARoads Roadtrips  
   Logs.
   http://www.aaroadtrips.com/

Multiplex Index  
   Gallery of shields along roads with more than one route number.
   http://www.m-plex.com/roads/mpindex.html

Roadgeeking  
   Louisiana, U.S. as well as Taiwan.
   http://public.fotki.com/apjung/roadgeeking/

Interstate-Guide.com  
   Includes the Interstate Guide, the List of Interstate Business Routes, and the Interstate Shield Gallery. Extensive coverage.
   http://www.interstate-guide.com/

Mike's Railroad Crossing Website  
   Covers the United States, Canada, the United Kingdom, and Australia. Also includes picture-taking guide, links, and FAQ.
   http://www.hostultra.com/~rxrsignals/

Pictures of Highway Shields  
   Covers North America (primarily the Western U.S.), Asia and western Europe. Also includes a discussion forum on roads.
   http://hwy-shields.calrog.com/

Jonathan's Photographs  
   Culled from various trips around the world.
   http://winklers-roads.fotopic.net/

Mark Furqueron's Highway Page  
   Includes views mostly from the American West, predominantly California, as well as Asia and Europe. Includes pages on removed vintage signage.
   http://members.cox.net/mkpl/road.html