Section 625 ILCS 5/12-812.1(a) The Department shall adopt and promulgate rules and regulations governing the use of liquefied petroleum gases, compressed natural gases and liquefied natural gases as a propellant fuel in school buses. Such rules and regulations shall include the installation, maintenance and operation of such equipment installed on school buses and shall be based on the generally accepted standards of safety as recommended by the National Fire Protection Association.(b) All school buses using liquefied petroleum gases, compressed natural gases or liquefied natural gases as a propellant fuel must conform to and obey any rule or regulation lawfully adopted by the Department.