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Bird's eye view of Manhattan grid-lock

Samuel I. Schwartz, also known as Gridlock Sam, is an American transportation engineer, formerly the New York City Traffic Commissioner, notable for popularizing the phrase "gridlock".^[1]

^ Kantrowitz, Barbara (February 6, 1983). "The ultimate traffic jam—New Yorkers have a name for it: gridlock". The Seattle Times. Knight News Service. p. A16.