. ▁I - 8 6 ▁connect s ▁to ▁U . S . ▁Route   2 1 9 ▁( US   2 1 9 ) ▁in ▁Sal aman ca , ▁I - 3 9 0 ▁near ▁Av oca ▁and ▁I - 9 9 ▁/ ▁US   1 5 ▁just ▁west ▁of ▁Cor ning . ▁ ▁Most ▁of ▁the ▁Quick way ▁and ▁the ▁Southern ▁Tier ▁Express way ▁was ▁built ▁in ▁stages ▁from ▁the ▁ 1 9 5 0 s ▁to ▁the ▁ 1 9 8 0 s . ▁The ▁I - 8 6 ▁design ation ▁was ▁assigned ▁on ▁December ▁ 3 , ▁ 1 9 9 9 , ▁to ▁the ▁entire ty ▁of ▁since - de comm ission ed ▁Pennsylvania ▁Route ▁ 1 7 ▁( PA   1 7 ) ▁and ▁to ▁the ▁western most ▁ ▁of ▁NY   1 7 . ▁It ▁has ▁been ▁extended ▁east ward ▁as ▁more ▁sections ▁of ▁the ▁existing ▁NY   1 7 ▁fre ew ay ▁have ▁been ▁upgrad ed ▁to ▁Inter state ▁Highway ▁standards , ▁first ▁to ▁NY   1 4 ▁in ▁Hor se head s ▁in ▁ 2 0 0 4 , ▁to ▁NY   3 5 2 ▁in ▁El mi ra ▁in ▁ 2 0 0 8 , ▁and ▁its ▁current ▁termin us ▁at ▁the ▁Chem ung - T i oga ▁County ▁line ▁in ▁ 2 0 1 3 . ▁The ▁segment ▁of ▁NY   1 7 ▁between ▁I - 8 1 ▁and ▁NY   7 9 ▁was ▁designated ▁as ▁part ▁of ▁I - 8 6 ▁in