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.
A.R.S. § 28-755
Hand or arm signals or mechanical signal
Official source: Arizona State Legislature. Reproduced from public-domain Arizona statutes; confirm against the official source for the current text. Not legal advice.