 The functional classification of NY 205 is Principal Arterial from I-88 to the northern overlap of NY 23, and Minor Arterial for the rest of its length.Functional classification is the process by which roads, streets, and highways are grouped into classes according to the character of service they provide.NY 205 was assigned as part of the 1930 renumbering of state highways in New York to a series of substandard highways connecting the hamlets of West Oneonta and Oaksville.