§47-12-409.

§47-12-409.
   
   Vehicles transporting explosives, flammable liquids in cargo tanks, or
   compressed gases as a cargo or part of a cargo, excluding compressed
   gas cylinders transported on service vehicles, shall at all times
   comply with the provisions of this section.
   
   1. Said vehicle shall be conspicuously and legibly marked or placarded
   on each side and the rear with the words "Explosive," "Flammable,"
   "Compressed Gas" or "Flammable Compressed Gas" as applicable in
   letters at least six (6) inches high, or shall be marked or placarded
   in accordance with Section 77.823 of the Interstate Commerce
   Commission Regulations.
   
   2. Each such vehicle shall be provided with at least one portable fire
   extinguisher having at least a 12-B, C rating or when more than one is
   provided each extinguisher will have at least a 6-B, C rating,
   provided however, that each combination truck tractor and semitrailer
   unit transporting flammable liquids or flammable compressed gas in
   bulk shall be equipped with at least one portable fire extinguisher
   having at least a 6-B, C rating in or on the tractor, and at least one
   portable fire extinguisher having at least a 12-B, C rating at a
   convenient location on the trailer. Ratings shall be in accordance
   with the NFPA Standards for Installation, Maintenance and Use of
   Portable Fire Extinguishers, No. 10.
   
   3. The Commissioner is hereby authorized and directed to promulgate
   such additional regulations governing the transportation of
   explosives, flammable liquids and other dangerous articles, except
   liquified petroleum gas and anhydrous ammonia, by vehicles upon the
   highways as he shall deem advisable for the protection of the public.