 In 1928 , U.S. Route 111 was designated , and along with Pennsylvania Route 84 , consisted of the alignment of Route 287 . Route 111 was redesignated as part of U.S. Route 15 . The highway was redesignated as Route 287 in 1961 when Route 84 was decommissioned in favor of Interstate 84 . The route was extended from Tioga to Lawrenceville in 2008 , when the construction of U.S. Route 15 was finished to the New York state line , and Route 287 was extended to Route 49 . 
