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Question:

You arrive at an intersection only to find that the traffic signals are not working - they are completely unlit. What should you do?

A Treat the intersection like an all-way STOP.
Explaination

You should treat an intersection with an unlit set of traffic signals like an all-way STOP. [Inoperative Signal Lights, Signal Lights, Section 3: Rules of the Road, Arizona Driver License Manual]