N.J. Stat. Ann. § 39:3B-15

3. No school bus may be operated using liquefied petroleum gas as the sole fuel, or in addition to or in combination with a conventional fuel, unless the school bus has been equipped or converted for such use and is operated in accordance with (1) all applicable federal and State laws, rules, regulations, codes, standards, and guidelines pertaining thereto, including but not limited to any such rules, regulations, codes, standards, and guidelines that may be adopted by the National Highway Traffic Safety Administration, and (2) all applicable codes, standards, and guidelines established by the National Fire Protection Association for the storage, handling, and use of liquefied petroleum gas.