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Article 12. Camper Signaling Devices of California Vehicle Code >> Division 12. >> Chapter 5. >> Article 12.

(a) Every motor vehicle upon which a camper is mounted shall be equipped with an audible or visual signaling device which can be activated from inside the camper and which is constructed so as to allow any person inside the camper to gain the attention of the driver of the motor vehicle. In no event shall a horn, as required by Section 27000, be used to comply with this subdivision.
  (b) No person shall drive a motor vehicle upon which is mounted a camper containing any passenger unless the motor vehicle is equipped as required by subdivision (a).
The provisions of Section 28080 shall not apply to either of the following:
  (a) Any motor vehicle upon which a camper is mounted if a person is able to move between the cab portion of the motor vehicle and the camper.
  (b) Any motor vehicle upon which a camper is mounted, which motor vehicle is equipped with a sliding or removable rear window which can be opened or removed by a person inside such camper.