High Quality Content by WIKIPEDIA articles! New York State Route 448 (NY 448) is a 3.90-mile (6.28 km) long state highway in western Westchester County, New York in the United States. The route begins in the village of Sleepy Hollow at U.S. Route 9 (US 9) and goes in a northeast direction through the Pocantico Hills community in Mount Pleasant. It ends at NY 117 in Mount Pleasant, near the junction of NY 117 with Saw Mill River Road (NY 9A and NY 100) and the Taconic State Parkway. From 1930 to 1971, NY 448 was part of NY 117.