2006 New York Code - Ramps.

 
    §  27-470  Ramps. Ramps used for the movement of motor vehicles and as
  required exits need not be enclosed when serving tiers above grade. Such
  ramps shall have a gradient not exceeding one  in  seven,  with  nonslip
  surfaces.  A  landing having a minimum dimension of twenty feet shall be
  provided at the discharge point of all ramps at the street level, within
  the street line. Where a ramp is also used  for  the  parking  of  motor
  vehicles,  it shall be considered as a parking tier and may not serve as
  an exit for the occupants of the structure.