The All Streets map visualizes of all the 240 million individual road segments in the United States. Although no other features — outlines, cities, or types of terrain — are marked, canyons and mountains emerge as the roads are layed around them.
Roadless terrain forms the topography of the Appalachian Mountains.
San Francisco. A detail of the West Coast shows the scarcity of roads in mountainous areas, punctuated by the densely populated Bay Area.
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