Although not shielded, NYSDOT reference markers identify the route as “878I” for the freeway portion within the vicinity of Interstate 678 and John F. Kennedy Expressway. The I suffixed on NYSDOT reference markers identifies an Interstate highway. According to Steve Anderson’s site, I-878 shields were posted in 1989 when the Interstate designation was first confirmed.
Prior to the renumbering of Interstates 278 and 895 in Bronx, New York by AASHTO on June 23, 1969:, the Interstate 878 designation was reserved for the Bruckner Expressway east from the Sheridan Expressway (I-895) to the Bruckner Interchange with I-95. During that time period, Interstate 278 followed the Sheridan Expressway north to the Cross Bronx Expressway. It was proposed to extend 5.2 miles further along an alignment over U.S. 1 (Boston Post Road) northeast to Interstate 95 at the New England Thruway. The Sheridan Expressway extension however was dropped in 1971, along with several other metropolitan expressway proposals.2 I-278 was instead realigned over planned I-878 and the small section of the Sheridan Expressway was redesignated as Interstate 895. For more, visit Steve Anderson’s Sheridan Expressway.