 While NY 30 heads generally north–south between the two locations and passes through Amsterdam, NY 30A veers west to serve the villages of Fonda and Fultonville and the cities of Johnstown and Gloversville.Along the way, it connects to several major east–west highways, including U.S. Route 20 (US 20) in Esperance and the New York State Thruway in Fultonville.All of NY 30A north of NY 7 in Central Bridge was originally designated as New York State Route 148 as part of the 1930 renumbering of state highways in New York, replacing NY 54 from Fonda to Mayfield.