2006 New York Code - Hazard Vehicle.

 
    § 117-a. Hazard  vehicle.   Every vehicle owned and operated or leased
  by a utility, whether public  or  private,  used  in  the  construction,
  maintenance  and  repair  of  its  facilities,  every  vehicle specially
  equipped or designed for the towing or  pushing  of  disabled  vehicles,
  every vehicle engaged in highway maintenance, or in ice and snow removal
  where  such  operation involves the use of a public highway and vehicles
  driven by rural letter  carriers  while  in  the  performance  of  their
  official duties.