Cal. VEH § 16002

(a) If the driver at the time of the accident was driving a motor vehicle owned, operated, or leased by the employer of the driver and with the permission of the employer, then the driver shall within five days after the accident report the accident to his employer on a form approved by the employer. Within 10 days after receipt of the report the employer shall transmit a report on a form approved by the department to the office of the department at Sacramento, except that an employer need not transmit such report when the vehicle involved in the accident is owned or operated as described in Section 16051 or 16052, or is owned or operated by any person or corporation who has filed with the department a certificate of an insurance carrier or surety company that there is in effect a policy or bond meeting the requirements of Section 16056 and when such policy or bond is in force with respect to the vehicle at the time of the accident.

(b) The driver of a vehicle that is owned or operated by a publicly owned or operated transit system, or that is operated under contract with a publicly owned or operated transit system, and that is used to provide regularly scheduled transportation to the general public or for other official business of the system shall, within 10 days of the occurrence of the accident, report to the transit system any accident of a type otherwise required to be reported pursuant to subdivision (a) of Section 16000. The transit system shall maintain records of any report filed pursuant to this paragraph. Within 10 days after receipt of the report, the transit system shall transmit a report on a form approved by the department to the office of the department in Sacramento, except that a transit system is not required to submit a report when the vehicle involved in the accident is owned or operated as described in subdivision (b) of Section 16000.