Ariz. Rev. Stat. § 28-645
A. If traffic is controlled by traffic control signals exhibiting different colored lights or colored lighted arrows successively one at a time or in combination, only the colors green, red and yellow shall be used, except for special pedestrian signals carrying a word legend. The lights shall indicate and apply to drivers of vehicles and pedestrians as follows:
1. Green indication:
2. Steady yellow indication:
3. Red indication: