; 129 Stat. 1541), the Secretary of Transportation may not issue a notice of proposed rulemaking to modify the carrier safety fitness standards and methodologies in effect for motor carriers on the date of enactment of this Act. (2) Limitations on use of carrier safety fitness determinations The following requirements shall apply with respect to a carrier safety fitness determination made by the Secretary, using procedures in effect on the date of enactment of this Act, in connection with a motor carrier engaged in providing transportation of passengers: (A) The Secretary may not use the carrier safety fitness determination to instruct a cessation of operations or revocation. (B) The Secretary may determine the motor carrier to be unfit to operate only upon— (i) completion of a compliance review or comprehensive safety investigation; and (ii) consideration of a corrective action plan, if submitted. (C) The Secretary shall continue to assign satisfactory and conditional ratings as appropriate. (D) Any assigned rating shall include the date on which the rating was assigned. (b) Availability of information developed under CSA program (1) In general Section 5223 of the FAST Act ( 49 U.S.C. 31100 note; 129 Stat. 1541) is amended— (A) in subsection (a) by striking or the commercial motor vehicle driver and inserting , the commercial motor vehicle driver, or the motor carrier of passengers (including any private school bus operator) ; and (B) in subsection (d)— (i) in paragraph (1)— (I) in subparagraph (A) by striking the semicolon at the end and inserting ; and ; and (II) in subparagraph (B)— (aa) by striking and a commercial motor vehicle driver and inserting , a commercial motor vehicle driver, and a motor carrier of passengers (including any private school bus carrier) ; (bb) by striking or driver, respectively; and and inserting or driver, as appropriate. ; and (cc) by striking subparagraph (C); (ii) by striking paragraph (2)