2006 New York Code - Snow Emergency Route.

 
    § 145-c. Snow  emergency  route.  A  street or highway designated as a
  snow emergency route by the state or  municipality  having  jurisdiction
  over  such street or highway upon which no vehicle shall operate without
  snow tires and/or tire chains when a snow emergency has been declared by
  the  state  or  municipality  having  jurisdiction  thereof.  Each  snow
  emergency  route  shall  be  posted in accordance with the provisions of
  article forty-four of this chapter. The provisions of this section shall
  not apply to signs installed and operative prior to the  date  on  which
  this  section  takes  effect,  provided, however, that the provisions of
  this section shall apply to signs replaced on and after such date.