; or (B) provide to the applicant, in writing, a specific valid reason for withholding approval of the application. (2) Supplemental information If an applicant that receives written notice under paragraph (1)(B) submits to the Secretary information that satisfies the reason of the Secretary for withholding approval of the application, the Secretary shall approve the application not later than 5 days after the date of receipt of the information. (e) Guidance for new entrants (1) Issuance The Secretary shall ensure that a new entrant that submits an application for such operating authority is made aware of the resources available to new entrants for safe and compliant operations, including the criteria for safety audits of such new entrant. (2) Registration fees The Secretary may not increase registration fees for new entrant applications described in paragraph (1) in excess of $350. . 3. FAST Act reform (a) Carrier safety fitness determinations (1) Notice of proposed rulemaking Before the date on which the Inspector General of the Department of Transportation makes the certification under section 5223(a) of the FAST Act ( 49 U.S.C. 31100 note; 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 of passengers 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 or unsatisfactory to operate only upon— (i) completion of a compliance review or comprehensive safety investigation