New York State Route 9A

New York State Route 9A
NY 9A highlighted in red
Route information
Auxiliary route of US 9
Maintained by NYSDOT, NYCDOT, MTAB&T and the City of Yonkers
Length	47.25 mi[1] (76.04 km)
Existed	1930[2]–present
Component highways	Henry Hudson Parkway from Riverside South to Riverdale
Restrictions	No commercial vehicles between exits 8 and 23
Major junctions
South end	I-478 / FDR Drive / Battery Place in Battery Park City
Major intersections	I-95 / US 1-9 in Fort Washington Park US 9 / Henry Hudson Parkway in Riverdale Saw Mill River Parkway in Yonkers I-87 / New York Thruway in Ardsley I-287 in Elmsford Saw Mill River Parkway in Mount Pleasant NY 100 / NY 141 in Hawthorne Taconic State Parkway in Mount Pleasant US 9 from Ossining to Croton-on-Hudson
North end	US 9 in Peekskill
Location
Country	United States
State	New York
Counties	New York, Bronx, Westchester
Highway system
New York Highways Interstate US State Reference Parkways
← US 9 → NY 9B
← US 6 NY 6A → NY 6B

New York State Route 9A (NY 9A) is a state highway in the vicinity of New York City in the United States. Its southern terminus is at Battery Place near the northern end of the Brooklyn–Battery Tunnel in New York City, where it intersects with both the unsigned Interstate 478 (I-478) and FDR Drive. The northern terminus of NY 9A is at U.S. Route 9 (US 9) in Peekskill. It is predominantly an alternate route of US 9 between New York City and Peekskill; however, in New York City, it is a major route of its own as it runs along the West Side Highway and Henry Hudson Parkway. It is also one of only two signed New York State routes in Manhattan (the other is NY 25). In northern Westchester County, NY 9A follows the Briarcliff–Peekskill Parkway.

The origins of NY 9A date back to the 1920s when an alternate route of then-NY 6 from Yonkers to Tarrytown was designated as NY 6A. NY 6 was redesignated as US 9 in 1927; however, NY 6A was not renumbered to NY 9A until the 1930 renumbering of state highways in New York. NY 9A was extended south into New York City in 1934 and north to Ossining in the late 1930s. In 1933, the Briarcliff–Peekskill Parkway opened as NY 404. All of NY 404 was incorporated into an extended NY 9A on January 1, 1949. NY 9A was extended northward to Peekskill in 1967 following the completion of the Croton Expressway and southward to the Brooklyn–Battery Tunnel in the mid-1990s.