Cal. VEH § 34687

(a) Registration shall not be granted to a private carrier of passengers until proof of financial responsibility is filed by an insurer or surety with the department. The department may accept only a currently effective certificate of insurance issued by a company licensed to write that insurance in this state or by a nonadmitted insurer subject to Section 1763 of the Insurance Code, and only if the policy represented by the certificate meets the minimum insurance requirements contained in Section 34692, or a surety bond evidencing protection against liability imposed by law for the payment of damages for personal injury to, or death of, a person or property damage, or both. Each certificate shall be valid until canceled, and may only be canceled upon 30 days’ written notice submitted to the department by the carrier or surety.

(b) Whenever the department determines that the certificate of insurance or surety bond of a private carrier of passengers has lapsed or been terminated, the department shall suspend the private carrier of passengers’ registration. Registration of a private carrier or organization providing transportation services incidental to operation of a youth camp shall stand suspended immediately upon the effective date of the cancellation.

(c) The department shall notify the private carrier of passengers of an action taken under subdivision (b).