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On the outskirts of Detroit and in the suburbs, the land is covered by a gridiron network of concrete roads conveniently spaced one mile apart, sometimes referred to as the "mile road system". Some of these roads are named for their distance from downtown Detroit, beginning with Five Mile Road and continuing all the way up to Thirty-Seven Mile Road in northern Macomb County. This grid has such a dominance over the landscape that it is visible from outer space.