49 CFR § 390.205 - Special requirements for registration.
(1) General. A person applying to operate as a motor carrier, broker, or freight forwarder under this subpart must make the additional filings described in paragraphs (a)(2) and (a)(3) of this section as a condition for registration under this subpart within 90 days of the date on which the application is filed:
(2) Evidence of financial responsibility.
(i) A person that registers to conduct operations in interstate commerce as a for-hire motor carrier, a broker, or a freight forwarder must file evidence of financial responsibility as required under part 387, subparts C and D of this subchapter.
(ii) A person that registers to transport hazardous materials as defined in 49 CFR 171.8 (or any quantity of a material listed as a select agent or toxin in 42 CFR part 73) in interstate commerce must file evidence of financial responsibility as required under part 387, subpart C of this subchapter.
(3) Designation of agent for service of process. All motor carriers (both private and for-hire), brokers and freight forwarders required to register under this subpart must designate an agent for service of process (a person upon whom court or Agency process may be served) following the rules in part 366 of this subchapter:
(b) If an application is subject to a protest period, the Agency will not activate a USDOT Number until expiration of the protest period provided in § 365.115 of this subchapter or - if a protest is received - after FMCSA denies or rejects the protest, as applicable.