Transportation
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The U.S. Coast and Geodetic Survey determined the latitude, longitude, and elevation of the Zero Milestone. It was authorized by Act of Congress on June 5, 1920, and dedicated on June 4, 1923. It served as the point for measuring distances from Washington on highways of the United States, and it was the starting point of the first trans-continental motor convoy over the Lincoln Highway on July 7, 1919, and of the second trans-continental motor convoy over the Bankhead Highway on June 14, 1920.
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Washington, District of Columbia · United States
