After crossing an abandoned railroad grade, the parkway enters Exit 3, a small interchange with Yonkers Avenue.

The parkway then enters an interchange with the New York State Thruway (I-87) and NY 100, Exits 4S (for I-87 south) and 4N (for I-87 north/NY-100 north).

In the center of this interchange, consisting of several flyover ramps, is the Fleetwood Metro-North Railroad station on the Harlem Line.

The Cross County parallels a park in the Chester Heights section of Mount Vernon.

Construction began in 1929, and the highway was initially a 40-foot (12 m)-wide undivided roadway that could accommodate four lanes of automobile traffic (two in each direction).

[6] Exit 6 was rebuilt from 1955 to 1957 as part of modernization efforts on the Bronx River Parkway.

Part of the right of way for the Cross County Parkway's unbuilt extension has since been incorporated into the Leatherstocking Trail.

[8] A major widening of the Cross County Parkway began in 1964; however, the project was not completed until 1984.