49 CFR § 385.305 - What happens after the FMCSA receives a request for new entrant registration?
(b) The application package will include the following:
(c) Upon completion of the application form, the new entrant will be issued an inactive USDOT Number. An applicant may not begin operations nor mark a commercial motor vehicle with the USDOT Number until after the date of the Agency's written notice that the USDOT Number has been activated. Violations of this section may be subject to the penalties under § 392.9b(b) of this chapter.
(d) Additional requirements for certain for-hire motor carriers. For-hire motor carriers, unless providing transportation exempt from the commercial registration requirements in 49 U.S.C. chapter 139, must obtain operating authority as prescribed under § 390.201(b) and part 365 of this chapter before operating in interstate commerce.