for the city swapping ownership of its street areas to be closed within the developments; the segment along First Avenue was widened by 34 ft.

1950s to 1990s

First Avenue has carried one-way traffic since June 4, 1951.

The tunnel on First Avenue adjacent to the west side of the Headquarters of the United Nations opened to traffic on April 3, 1953. This vehicular tunnel was constructed to provide a bypass for through traffic, reducing traffic volumes on the

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