2006 New York Code - Speed Limits; Posting Of Signs.

 
    §  19-177  Speed Limits; posting of signs. a. The official speed limit
  for a vehicle in the city of New York shall be  thirty  miles  per  hour
  except  where an official sign indicates that a different speed limit is
  in effect.
    b. No person shall drive a vehicle on any  street  in  excess  of  the
  speed limit in effect for that street.
    c.  The commissioner shall post a sign at each exit within the city of
  New York of each bridge and tunnel having only one terminus in the  city
  of New York that states the speed limit within the city.