49 C.F.R. § 387.7 : Transportation — OTHER REGULATIONS RELATING TO TRANSPORTATION — FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION — FEDERAL MOTOR CARRIER SAFETY REGULATIONS — MINIMUM LEVELS OF FINANCIAL RESPONSIBILITY FOR MOTOR CARRIERS — MOTOR CARRIERS OF PROPERTY — Financial responsibility required

(a) No motor carrier shall operate a motor vehicle until the motor carrier has obtained and has in effect the minimum levels of financial responsibility as set forth in §387.9 of this subpart.
(b)
(1) Policies of insurance, surety bonds, and endorsements required under this section shall remain in effect continuously until terminated. Cancellation may be effected by the insurer or the insured motor carrier giving 35 days' notice in writing to the other. The 35 days' notice shall commence to run from the date the notice is transmitted. Proof of transmission shall be sufficient proof of notice.
(2) Exception. Policies of insurance and surety bonds may be obtained for a finite period of time to cover any lapse in continuous compliance.
(3) Exception.
(i) A Mexico-domiciled motor carrier operating solely in municipalities in the United States on the U.S.-Mexico international border or within the commercial zones of such municipalities with a Certificate of Registration issued under part 368 may meet the minimum financial responsibility requirements of this subpart by obtaining insurance coverage, in the required amounts, for periods of 24 hours or longer, from insurers that meet the requirements of § 387.11.
(ii) A Mexican motor carrier so insured must have available for inspection in each of its vehicles copies of the following documents:
(A) The Certificate of Registration;
(B) The required insurance endorsement (Form MCS-90); and
(C) An insurance identification card, binder, or other document issued by an authorized insurer which specifies both the effective date and the expiration date of the temporary insurance coverage authorized by this exception.
(iii) Mexican motor carriers insured under this exception are also exempt from the notice of cancellation requirements stated on Form MCS-90.
(c) Policies of insurance and surety bonds required under this section may be replaced by other policies of insurance or surety bonds. The liability of the retiring insurer or surety, as to events after the termination date, shall be considered as having terminated on the effective date of the replacement policy of insurance or surety bond or at the end of the 35 day cancellation period required in paragraph (b) of this section, whichever is sooner.
(d) Proof of the required financial responsibility shall be maintained at the motor carrier's principal place of business. The proof shall consist of-
(1) "Endorsement(s) for Motor Carrier Policies of Insurance for Public Liability Under Sections 29 and 30 of the Motor Carrier Act of 1980" (Form MCS-90) issued by an insurer(s);
(2) A "Motor Carrier Surety Bond for Public Liability Under Section 30 of the Motor Carrier Act of 1980" (Form MCS-82) issued by a surety; or
(3) A written decision, order, or authorization of the Federal Motor Carrier Safety Administration authorizing a motor carrier to self-insure under §387.309, provided the motor carrier maintains a satisfactory safety rating as determined by the Federal Motor Carrier Safety Administration under part 385 of this chapter.
(e)
(1) The proof of minimum levels of financial responsibility required by this section shall be considered public information and be produced for review upon reasonable request by a member of the public.
(2) In addition to maintaining proof of financial responsibility as required by paragraph (d) of this section, non-North America-domiciled private and for-hire motor carriers shall file evidence of financial responsibility with FMCSA in accordance with the requirements of subpart C of this part.
(f) All vehicles operated within the United States by motor carriers domiciled in a contiguous foreign country, shall have on board the vehicle a legible copy, in English, of the proof of the required financial responsibility (Form MCS-90 or MCS-82) used by the motor carrier to comply with paragraph (d) of this section.
(g) Any motor vehicle in which there is no evidence of financial responsibility required by paragraph (f) of this section shall be denied entry into the United States.

49 C.F.R. §387.7

46 FR 30982, 6/11/1981; 46 FR 45612, 9/14/1981, as amended at 48 FR 5559, 2/7/1983; 48 FR 52683, 11/21/1983; 51 FR 22083, 6/18/1986; 54 FR 49092, 11/29/1989; 59 FR 63923, 12/12/1994; 67 FR 12661, 3/19/2002; 73 FR 76496, 12/16/2008; 83 FR 16226, 6/15/2018; 83 FR 16226, 6/18/2018