 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 <unk> and NY 100 ) and the <unk> State Parkway . From 1930 to the early 1970s , NY 448 was part of NY 117 . 
