N.Y. Comp. Codes R. & Regs. tit. 17, § 182.34 – Speed limits.

(a) Except where otherwise posted, and except where such maximum speeds are unsafe, the maximum speeds at which vehicles may be operated on the parkways within the parkway system are as follows:
1. (1) Cross County Parkway.
  1. (i) Forty-five miles per hour between the Saw Mill River Parkway and Westchester Avenue in the City of Mount Vernon.
  2. (ii) Fifty-five miles per hour between Westchester Avenue in the City of Mount Vernon and the Hutchinson River Parkway.
  3. (iii) Forty miles per hour on the Wartburg Extension of the Cross County Parkway between the Cross County Parkway and the Hutchinson River Parkway.
2. (2) Hutchinson River Parkway.
  1. (i) Fifty miles per hour between the Westchester County New York City boundary line and Wilmot Road in the City of New Rochelle.
  2. (ii) Fifty-five miles per hour between Wilmot Road in the City of New Rochelle and the Westchester County Connecticut State boundary line.
3. (3) Saw Mill River Parkway.
  1. (i) Fifty miles per hour between the Westchester County New York City boundary line and the Taconic State Parkway at the Hawthorne interchange.
  2. (ii) Fifty-five miles per hour between the Taconic State Parkway at the Hawthorne interchange and the connection with the service roads forming part of Interstate Route 684 near the Village of Katonah.
4. (4) Rumsey Road. Thirty-five miles per hour between Spruce Street and the Saw Mill River Parkway in the City of Yonkers.
5. (5) Farragut Parkway. Thirty-five miles per hour between Farragut Avenue and the Saw Mill River Parkway in the Village of Hastings on Hudson.
6. (6) Sprain Brook State Parkway. Fifty-five miles per hour between the ramp connections with the Bronx River Parkway and the ramp connections to the Cross Westchester Expressway in the Village of Elmsford.
7. (7) Taconic State Parkway.
  1. (i) Fifty miles per hour between the Kensico traffic circle in the Town of North Castle and the Saw Mill River Parkway at the Hawthorne interchange.
  2. (ii) Fifty-five miles per hour between the Saw Mill River Parkway at the Hawthorne interchange, Westchester County, and the Berkshire spur of the New York State Thruway (IR 90) in the Town of Chatham, Columbia County.
(b) Where a lesser speed limit is posted, no person shall operate a vehicle in excess of such posted speed limit.
(c) No person shall drive a motor vehicle within the parkway system at such a slow speed as to impede the normal and reasonable movement of traffic except when entering upon or preparing to exit from the parkway system, when preparing to stop, or when necessary for safe operation or in compliance with law.
(d) Vehicles approaching a parkway toll station shall reduce speed commensurate with speed limit signs, or road conditions, and shall stop in the appropriate designated location and pay the required toll.