- a) This Part applies to any school bus which is equipped to use any liquefied petroleum gas or compressed natural gas as a fuel propellant and began operation on or after February 26, 1990.
- b) This Part does not apply to any school bus which was equipped to use any liquefied petroleum gas or compressed natural gas as a fuel propellant before February 26, 1990.
(Source: Amended at 19 Ill. Reg. 16732, effective December 1, 1995)