 Instead of continuing east to Jasper on a direct line from Andover, NY 17 curved north to serve Hornell by way of what is now NY 21 and NY 36.NY 17 was rerouted in the 1930 renumbering to follow a previously unnumbered direct route between Andover and Jasper while the old routing between Andover and Hornell became NY 17F.NY 17F also continued south along NY 21 (which replaced NY 17 from Hornell to Jasper) to Canisteo, then east over an unnumbered roadway to NY 17 in Addison (via Cameron and Rathbone).