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Interstate 78 in New York
Interstate 78 (I-78) is a part of the Interstate Highway System that runs from Union Township, Lebanon County, Pennsylvania, to New York City. The portion of I-78 within the U.S. state of New York is just long as it crosses the Hudson River from New Jersey via the Holland Tunnel and ends at the exit rotary in Lower Manhattan. Therefore the entire route is maintained by the Port Authority of New York and New Jersey. However, a much longer route was once planned, heading east via the Williamsburg Bridge to the John F. Kennedy International Airport and then north over the Throgs Neck Bridge to I-95 in the Bronx. The parts of this that were built are now New York State Route 878 (NY 878) and I-295.
==Route description==
The Holland Tunnel consists of two one-way two-lane tunnels. The entrance plaza to the westbound tunnel is a rectangular block bounded by Broome, Varick, Watts, and Hudson streets, with four entrances feeding into the tunnel from all directions, including one from Canal Street. The westbound portal is to the north, just south of Dominick Street. The exit plaza is in the square double block that previously housed the New York Central Railroad's St. John's Park Terminal, bounded by Laight, Varick, Beach, and Hudson streets. Traffic leaves the tunnel at a portal at the southeast corner of Canal and Hudson streets, and heads southeast along the south line of Canal Street and south along the west line of Varick Street to the northeast corner of the plaza. Five exits, numbered 1 to 5, can be taken from the almost-circular roadway known as the Holland Tunnel Rotary one to each corner and one to the middle of the east side (Varick Street). A pedestrian overpass crosses the entrance to the plaza and exit 5 at the northeast corner, since the entrance from the tunnel cuts Laight Street.〔Google Maps street maps and USGS topographic maps, accessed via (ACME Mapper )〕
There are four auxiliary routes of I-78, all entering New York, and none connecting with I-78 (because of unbuilt parts of I-78, I-278, and I-478). I-278 begins in Linden, New Jersey, and passes through all five boroughs to end at the Bruckner Interchange in the Bronx; it was proposed to continue west to I-78 in Springfield. The original alignment of I-278 was to end at I-95 in the northeastern Bronx, and is now partially I-895. I-478 is currently the Brooklyn–Battery Tunnel and approaches, connecting I-278 in Brooklyn with the Battery in Manhattan; it was once planned to continue north along the unbuilt Westway to I-78 at the Holland Tunnel. I-478 was originally assigned to the Manhattan Bridge and a branch of the Lower Manhattan Expressway, connecting I-78 in Manhattan with I-278 in Brooklyn. I-678 runs from the John F. Kennedy International Airport in Queens north to the Bruckner Interchange; its original planned south end was at I-278 in northwestern Queens. I-878, signed as part of NY 878, is a short east–west route crossing I-678 at the JFK Airport; it was originally planned to continue west across Brooklyn to I-278 in the southwest part of the borough. The original I-878 is now I-278 east of I-895, and connected I-278 with I-78, I-95, and I-678.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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