In the 1930 renumbering of state highways in New York, NY 15 basically remained intact. The only change made at this time was the straightening out of the Victor–Pittsford segment, which now bypassed Mendon in favor of a more direct alignment between the two villages via Bushnell's Basin. The former alignment of NY 15 became part of NY 251 east of Mendon and part of NY 64 north of the hamlet. US 15 was extended into New York ; it replaced NY 2, which had extended from the Pennsylvania state line to Rochester. NY 15 was renumbered to NY 2 to eliminate numerical duplication with the U.S. Highway.