Section 19-170. Limitation on parking of commercial vehicles

a. When parking
  is  not  otherwise restricted, no person shall park a commercial vehicle
  in excess of three  hours.  For  purposes  of  this  section,  the  term
  commercial  vehicle  shall mean a motor vehicle designed, maintained, or
  used primarily for the transportation of property.
    b. Notwithstanding the foregoing, no person shall  park  a  commercial
  vehicle on a residential street from 9 p.m. to 5 a.m. For the purpose of
  this  subdivision,  residential streets are defined as those streets, or
  parts thereof, which are located within a residential district under the
  zoning resolution. Where a commercial vehicle is parked in violation  of
  this  subdivision, it shall be an affirmative defense to said violation,
  with the burden of proof on the person who received the summons, that he
  or she was actively engaged in business at  the  time  the  summons  was
  issued  at  a  premises  located  within  three city blocks of where the
  summons was issued. This subdivision shall not apply to  vehicles  owned
  or  operated  by  gas  or  oil heat suppliers or gas or oil heat systems
  maintenance companies, the agents or employees, thereof, or  any  public
  utility.
    c.  A  violation  of  this section shall be punishable by the monetary
  fine authorized for violation  of  the  rules  and  regulations  of  the
  commissioner  in  paragraph  one of subdivision a of section twenty nine
  hundred and three of the New York City Charter.
    d. Any commercial vehicle parked in violation of subdivision a or b of
  this section shall be subject to  impoundment  by  the  department.  Any
  motor  vehicle  impounded pursuant to the provisions of this subdivision
  shall not be released until all applicable towing and storage fees  have
  been   paid.   The   commissioner  shall  be  authorized  to  promulgate
  regulations concerning the procedure for the impoundment of vehicles.
    e. The sanctions and fees provided for in this  section  shall  be  in
  addition  to  any  other  sanctions, fees or remedies provided by law or
  regulation.