 When the first set of posted routes in New York were assigned in 1924, legislative Route 34 was designated as NY 20.NY 20 was redesignated as NY 57 in 1927 to avoid numerical duplication with the newly designated U.S. Route 20.The NY 57 corridor remained unchanged until the late 1950s when construction began on a new roadway to replace the existing two-lane, curvy routing of NY 57 between Fulton and Oswego.