CA Veh Code Section 5034

(a)

The department may issue a special license plate or other suitable device to a manufacturer or dealer of motorized bicycles upon payment of the fee specified in Section 5036. The license plate shall be of a size, color and configuration determined by the department. The form of the application shall also be determined by the department.

(b)

A manufacturer or dealer of motorized bicycles may operate or move a motorized bicycle upon the highways during the delivery of, or during the demonstration for the sale of, the motorized bicycle if the motorized bicycle displays thereon a license plate or other suitable device issued to the manufacturer or dealer.