3Īn eastern extension of Interstate 287 was proposed by Robert Moses to complete the beltway around New York via the Oyster Bay-Rye Bridge. Interstate 487 was subsequently redesignated as part of an extended I-287 east from the New York Thruway in 1961. Likewise your 187 should than be 487 since it constitutes a loop connecting with Interstate route at both ends. and it should be even numbered since it is a loop. North of NYC your 387 should change to 287 to match N.J. AASHO responded on Augwith a spate of recommendations regarding the statewide proposed numbering. Part of the urban Interstate numerology submitted to the American Association of State Highway Officials (AASHO) on August 22, 1958, the State of New York Department of Public Works numbered the Cross Westchester Expressway as Interstate 187 and the New York Thruway west from I-87 at White Plains as Interstate 387. The Cross Westchester Expressway opened to traffic in December 1960 at a cost of $50 million.
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