Other EquipmentCamper Signaling Devices
Section § 28080
If you have a motor vehicle with a camper attached, it must have a device such as a sound or light signal that someone inside the camper can use to get the driver's attention. The regular car horn can't be used for this.
You cannot drive a vehicle with passengers in the camper unless this signal is in place.
Section § 28081
This law section explains that certain rules about campers in Section 28080 do not apply to specific situations. First, if the camper attached to the vehicle allows people to move freely between the truck's cab and the camper, then the rules don't apply. Second, if the vehicle with the camper has a sliding or removable rear window that someone inside the camper can open or remove, the rules are also not applicable.