A.R.S. § 28-756: Method of giving hand and arm signals

A. Except as provided by subsection B, a person shall give all hand and arm signals required by this article from the left side of the vehicle in the following manner, and the signals shall indicate as follows:

1. Left turn. Hand and arm extended horizontally.

2. Right turn. Hand and arm extended upward.

3. Stop or decrease speed. Hand and arm extended downward.

B. A person operating a bicycle may give a right turn signal by extending the right hand and arm horizontally to the right side of the bicycle.