Cal. PUC § 5391

The commission shall, in granting permits or a certificate pursuant to this chapter, require the charter-party carrier of passengers to procure, and to continue in effect during the life of the permit or certificate, adequate protection against liability imposed by law upon the charter-party carrier of passengers for the payment of damages for personal bodily injuries, including death resulting therefrom, protection against a total liability of the charter-party carrier of passengers on account of bodily injuries to, or death of, more than one person as a result of any one accident, and protection against damage or destruction of property. The minimum requirements for such assurances of protection against liability shall not be less than the requirements which are applicable to operations conducted under certificates of public convenience and necessity issued pursuant to the provisions of Article 2 (commencing with Section 1031), Chapter 5, Part 1, Division 1, of this code, and the rules and regulations prescribed pursuant thereto shall apply to charter-party carriers of passengers.