(a) A motor carrier that is required to register under Subchapter B must file with the department evidence of insurance in the amounts required by § 643.101 or 643.1015, or evidence of financial responsibility as described by § 643.102, in a form prescribed by the department. The form must be filed:
(1) at the time of the initial registration;
(2) at the time of a subsequent registration if the motor carrier was required to be continuously registered under Subchapter B and the carrier failed to maintain continuous registration;
(3) at the time a motor carrier changes insurers; and
(4) at the time a motor carrier changes ownership, as determined by rules adopted by the department.
(b) A motor carrier shall keep evidence of insurance in a form approved by the department in the cab of each vehicle requiring registration the carrier operates.

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