I-86 Shield with Southern Tier Expressway marker
Western Entrance: Pennsylvania State Line between Erie and Jamestown
Eastern Terminus: Horseheads
Length: 184.4 miles
Counties: Chautauqua, Cattaraugus, Allegany, Steuben, Chemung
Routing: I-86 begins its trek across the southern portion of New York State at the Pennsylvania Line, just east of Erie and the I-90 interchange where the eastern segment of I-86 ends. The highway proceeds easterly through Jamestown, Olean, Corning, until Horseheads (a suburb of Elmira), where it transitions into a divided arterial where it has several traffic signals. Over the next several years, the I-86 designation will be extended easterly along Route 17, as more and more of Route 17 is upgraded to interstate standards. Once completed, the I-86 designation will extend as far easterly as I-87 in Orange County, north of New York City.
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