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To operate commercial vehicles in California, the following documents must
be carried and shown to enforcement personnel when requested:
Evidence of Financial Responsibility -- U.S. Domiciled Carriers: Proof of the required financial responsibility, such as the MCS 90 or the MCS 82, shall be maintained at the motor carrier's principal place of business.
The display of any one of the following identifiers on a commercial motor
vehicle shall be considered acceptable evidence of financial responsibility:
Evidence of Financial Responsibility -- Foreign domiciled carriers (Mexican & Canadian): Proof of the required financial responsibility, such as the MCS 90 or the MCS 82, shall be maintained in each vehicle operated in the United States.
For more information on evidence of financial responsibility, see the Code of Federal Regulations, Title 49, Section 387.7.