Contains examples from multiple continents, notably of Great Britain and Ireland. Link: http://www.sabre-roads.org.uk/gallery
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Culled from various trips around the world. Link: http://winklers-roads.fotopic.net
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Contains commentary and information about various routes.  Link: http://www.ptank.com/blog/category/highways
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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. Link: http://www.cbrd.co.uk/reference/international
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Main page for 'Me and The Roads' Java game Link: http://www.kurumi.com/roads/matr
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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  Link: http://www.didik.com/highway
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Road numbering systems - descriptions, route lists and road signs by Marcel Monterie  Link: http://sites.google.com/site/roadnumberingsystems
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Covers the United States, Canada, the United Kingdom, and Australia. Also includes picture-taking guide, links, and FAQ. Link: http://www.rxrsignals.net
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Rate the Roads is a guide for highway conditions throughout the United States and Canada. Highways are rated on safety, congestion, pavement condition, clarity of signing and aesthetics. Link: http://www.ratetheroads.com
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Covers North America (primarily the Western U.S.), Asia and western Europe.  Link: http://wwtl.info
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