The Southern Tier Expressway is the name of Interstate 86 (east) and State Route 17, which are under construction of going from a two lane to and all four lane highway and have been for years. The idea started in the 50s as a highway that would link Interstate 90 in the west to Binghamton in the east. The Expressway is not yet completed as there are segments that are not yet divided highway; however, the gaps are being filled in and it is almost completed.

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