Science Fair Project Encyclopedia
Interstate 878 is an unsigned route number for the Nassau Expressway in Queens, New York. It is signed as NY 878.
At 0.72 miles (1.2 km) long, I-878 is said to be the shortest 3-digit interstate in the nation. A strange fact about it is that it is a one-way only thoroughfare that leads from the Belt Parkway to the John F. Kennedy International Airport. Also, I-878 doesn't intersect with its "parent" route, I-78. However, it does have an intersection with I-678.
Previously, I-878 was used for a section of what is now Interstate 278 (Bruckner Expressway) between the Sheridan Expressway (I-895) and the Cross-Bronx Expressway (Interstate 95) in the Bronx. I-278 was routed north on the Sheridan, while its present route was taken by I-878. During the time that I-878 was routed in the Bronx, it was a signed route there.
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