Construction on a limited-access highway between Wayland and Dansville began . The highway opened to traffic as a realignment of NY 245. On January 1, 1970, the expressway became part of NY 401, a designation that also extended south to the town of Avoca and north to the city of Rochester along the Genesee Expressway, a proposed freeway utilizing the US 15 corridor. NY 401 was added to the Interstate Highway System and redesignated I-390 . As initially planned, I-390 would continue north into downtown Rochester and end at I-490 while the entirety of the Rochester Outer Loop south of I-490 would become I-590.