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Traffic signal at Columbus Circle.

First red/green traffic signal installed this day 1930.

Manual STOP and GO signals made their New York City debut in 1915 owing to increased vehicular traffic. As of June 30, 2011, — according to the NYC DOT — there were 12,460 intersections with traffic signals citywide, including 2,820 in Manhattan, 1,605 in the Bronx, 4,371 in Brooklyn, 3,119 in Queens and 545 in Staten Island. A video from 2008 shows one of the last functioning red/green traffic signals in Queens.

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