The Saw Mill River Parkway begins at the Bronx–Westchester line in Van Cortlandt Park as a continuation of the Henry Hudson Parkway. The Saw Mill River winds northward and parallels a former railroad grade into Yonkers. Now in the Southeast Yonkers section, southbound there is a ramp to McLean Avenue. Passing Tibbetts Lake, the Saw Mill River winds northward alongside the railroad grade as a four-lane roadway as it enters exit 4, which serves as the western terminus of the Cross County Parkway. Immediately after the Cross County, exit 5 forks off on a 180-degree turn for Yonkers Avenue and nearby Dunwoodie Golf Course. The parkway becomes at-grade after exit 5, entering exit 5A, which services Palmer Road in Northwest Yonkers.