is a State Highway in New York , United States , providing an alternate to US 9 from New York City north to Peekskill . In New York City, it is a major route of its own, running along the West Side Highway and Henry Hudson Parkway . In Westchester County , NY 9A follows the '''Briarcliff-Peekskill Parkway'''.
Route 9A begins in Lower Manhattan at the north end of the Brooklyn-Battery Tunnel ( Interstate 478 ) and heads north on the surface West Side Highway and Freeway -standard Henry Hudson Parkway , crossing US 9 for the first time at the east end of the George Washington Bridge . After crossing into The Bronx via the Henry Hudson Bridge , 9A proceeds to leave the parkway at exit 23, joining 9 on Broadway. The 9/9A concurrency runs for 2.85 miles within the city of Yonkers .
9A separates from US 9 along Ashburton Avenue then heads north as Saw Mill River Road. 9A parallels the Saw Mill River Parkway through Ardsley and Elmsford , to the west side of Hawthorne . 9A junctions with the southbound New York State Thruway I-87 , then later to a full junction with I-287 ( Cross Westchester Expressway ) providing a route to the Northbound Thruway I-87 . New York State Route 100 merges with 9A to form a 3.11 mile NY-100/NY-9A concurrency carrying the names Saw Mill River Road and Peekskill-Briarcliff Parkway, parallel to the Taconic State Parkway . NY-9A exits off this highway along the Peekskill-Briarcliff Parkway, while NY-100 continues straight as Saw Mill River Road. 9A merges to form a brief concurrency with US 9 as the Croton Expressway in Ossining just south of the Croton River.
The second 9/9A concurrency runs for 0.65 mile (1 km), with 9A leaving the Croton Expressway at Croton Point Avenue. The highway heads north along Riverside Avenue and eventually joins old Albany Post Road . After crossing 9 once more in Cortlandt , Route 9A ends at the Welcher Avenue Interchange in southern Peekskill .
Prior to the 1927 U.S. Highway System , US 9 was Route 6 . An alternate route from Yonkers to Tarrytown was assigned the number . This ran along the present alignment of Route 9A from Yonkers to north of Elmsford , where it turned west on Saw Mill Road, Neperan Road, County House Road and Bedford Road to end at Route 6 in Tarrytown.1
In the 1930 Renumbering , Route 6A was renumbered to Route 9A.''Automobile Legal Association (ALA) Automobile Green Book'', 1930/31 and 1931/32 editions, (Scarborough Motor Guide Co., Boston, 1930 and 1931). The 1930/31 edition shows New York state routes prior to the 1930 Renumbering It was extended south to the Holland Tunnel in New York City in mid-December 1934 , along with the marking of other numbered routes in New York City.2 The 1933 plan, compiled by the New York Automobile Club , had taken US 9 to the tunnel3 (in 1932 it would have continued south via the Staten Island Ferry 4), but the final plan took US 9 over the George Washington Bridge into New Jersey, with Route 9A taking over what was to be US 9.
The 1932 plan took Route 9A south through The Bronx and into Manhattan on Broadway (US 9 would have used Riverdale Avenue north of 230th Street , resulting in a short Concurrency across Spuyten Duyvil Creek ). It would have split to the south on Tenth Avenue at 218th Street in order to join the Harlem River Drive via Nagle Avenue and Dyckman Street . From there it would head west on 155th Street to Amsterdam Avenue , where it would head south to 79th Street , heading west there to rejoin US 9 at Riverside Drive . (It is unclear whether Route 9A would have continued south with US 9 to Lower Manhattan .) The 1933 plan made no changes to Route 9A, though US 9 was changed to use Broadway all the way through the Bronx.
In the final plan, however, no route was assigned to the Harlem River Drive-Amsterdam Avenue corridor. Instead, Route 9A used what had been planned as US 9, splitting at Broadway and Dyckman Street . Route 9A ran south along the west side of Manhattan on Riverside Drive and the West Side Highway (detouring around an unfinished section via 57th Street , Eleventh Avenue and 48th Street ) to end at the entrance and exit plazas of the Holland Tunnel .
As the Henry Hudson Parkway replaced Riverside Drive in the 1930s, Route 9A was moved onto it, eventually using the new parkway to the crossing with US 9 (Broadway) in the Bronx, where it continued to exit and run Concurrent with US 9 to the split in Yonkers .56 At the other end, an extension of Saw Mill River Road and the Briarcliff-Peekskill Parkway ran around Ossining to US 9 north of that village. Completed in 1933, National Bridge Inventory , a database compiled by the United States Department Of Transportation Federal Highway Administration , available at www.nationalbridges.com. Accessed 2007-09-06 . it was initially designated as , and became a realignment and extension of Route 9A between 1941 and 1951.78 An extension prior to 1941 had taken it north from Peekskill on Sleepy Hollow Road, rejoining US 9 between Tarrytown and Ossining.
A short extension on the south end happened after 1960, when Route 9A took over former Route 27A from the Holland Tunnel south to the Brooklyn-Battery Tunnel .910 To the north, the designation was extended at some point to Peekskill along the pre-Croton Expressway (opened in 1967) US 9, running concurrent with US 9 for a short distance to Croton-on-Hudson before splitting.11
''for a complete list of exits along those highways''
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Westchester
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18
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concur
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1821
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US 9
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Yonkers
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2
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Northern terminus of overlap
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2558
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NY 100B
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Greenburgh
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Western terminus of NY 100B
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2841
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I-287
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Exit 2 (I-287)
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2954
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NY 100C
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Greenburgh/Mount Pleasant line
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Western terminus of NY 100C
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3202
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NY 141
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Western terminus of NY 141
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concur
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3222
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NY 100
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Hamlet of Hawthorne southern terminus of overlap
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concur
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3533
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NY 100
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Briarcliff Manor/Mount Pleasant line
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Northern terminus of overlap
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concur
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3971
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US 9
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Southern terminus of overlap
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concur
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4036
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US 9
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Croton-on-Hudson
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Northern terminus of overlap
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