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

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

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.
members.cox.net Details

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

Multiplex Index
Gallery of shields along roads with more than one route number.
www.m-plex.com Details

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

Roadgeeking
Louisiana, U.S. as well as Taiwan.
public.fotki.com Details

WRX900
Covers road trips in the United States, as well as various places in Germany and Israel.
www.wrx900.com Details