AARoads Roadtrips: Logs.
Jonathan's Photographs: Culled from various trips around the world.
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.
Mike's Railroad Crossing Website: Covers the United States, Canada, the United Kingdom, and Australia. Also includes picture-taking guide, links, and FAQ.
Multiplex Index: Gallery of shields along roads with more than one route number.
Pictures of Highway Shields: Covers North America (primarily the Western U.S.), Asia and western Europe. Also includes a discussion forum on roads.
Roadgeeking: Louisiana, U.S. as well as Taiwan.
SABRE Photo Gallery: Contains examples from multiple continents, notably of Great Britain and Ireland.
WRX900: Covers road trips in the United States, as well as various places in Germany and Israel.