Roads and Highways

Worldwide Highway Library - Covers North America (primarily the Western U.S.), Asia and western Europe.
http://worldwide-hwys.calrog.com

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

Trans Global Highway - Proposal by a private citizen to construct a global railroad and vehicle highway around the world including a tunnel under the Bering Strait from the United States to Russia, from Sakhalin in Russia to Hokkaido in Japan, and from Spain to Africa. Includes maps.
http://www.didik.com/highway/

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

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

SABRE Photo Gallery - Contains examples from multiple continents, notably of Great Britain and Ireland.
http://www.sabre-roads.org.uk/gallery/

Me and the Roads - Java game involving road-building.
http://www.kurumi.com/roads/matr/

Ratetheroads.com - A guide for conditions of facilities as rated by website visitors.
http://www.ratetheroads.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.rxrsignals.net

CBRD - International - Page from Chris's British Road Directory illustrating the differences between roads in Great Britain and those in Andorra, Australia, Cuba, France, Iceland, Italy, Ireland, Mexico, Pakistan, Spain, and the United States.
http://www.cbrd.co.uk/reference/international/