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Tires of cars  are separated by a pair of painted yellow  lines in a parking lot, Bethesda, Maryland. According to the book written by Eran Ben-Joseph, ReThinking A Lot: The Design And Culture of Parking, "In fact, it is estimated that 500 million surface parking spaces exist in the United States alone---a number that increases everyday. In some U.S. cities, parking lots cover more than a third of the land area, becoming the single most salient landscape feature of our built environment."