buses with engines that extend beyond the firewall, to ensure that no hazardous quantity of gas or flame can pass through the firewall from the engine compartment to the passenger compartment. (B) Application The standards prescribed or amendments made under subparagraph (A) shall apply to school buses manufactured in, or imported into, the United States on or after the effective date of the standards or amendments. (3) Interior flammability and smoke emissions characteristics Not later than 1 year after the date of enactment of this Act, the Secretary shall amend section 571.302 of title 49, Code of Federal Regulations (relating to Federal Motor Vehicle Safety Standard Number 302), to adopt, with respect to a motor vehicle (as defined in section 30102(a) of title 49, United States Code), performance standards for interior flammability and smoke emissions characteristics that are not less rigorous than the performance standards for interior flammability and smoke emissions characteristics applicable to— (A) a compartment occupied by the crew or passengers of a transport category airplane (within the meaning of part 25 of title 14, Code of Federal Regulations (as in effect on the date of enactment of this Act)) under section 25.853 of title 14, Code of Federal Regulations (as in effect on the date of enactment of this Act)