Arizona Revised Statutes Title 28. Transportation § 28-755. Hand or arm signals or mechanical signal

A person shall give a stop or turn signal if required by this article by means of the hand and arm or by a signal lamp or lamps or mechanical signal. If a vehicle is constructed or loaded so that a hand and arm signal would not be visible both to the front and rear of the vehicle, the signals must be given by a lamp or lamps or signal device.