In 1909, the state of New York began to take control of many private highways across the state under the terms of the new highway law developed in 1908. One of these highways was the old north–south stagecoach road from Albany to Canada. Most of the highway north of modern NY 8 in Chester became the northern half of Route 22, an unsigned legislative route, under the text of the highway law. In 1913, the New York State Legislature created Route 22-b, a spur route connecting Route 22 in Schroon to the then-village of Ticonderoga. On March 1, 1921, Route 22-b became part of Route 48, a new route created as part of a partial renumbering of New York's legislative route system. The path of the former Albany–Canada stagecoach route was largely designated as US 9 in 1927.