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Question:

You arrive at an intersection with a set of traffic signals, all of whose lights are out. What should you do?

A Stop and then yield to cross traffic.
Explaination

When the traffic signals are not working, you must stop, yield to cross traffic, and only proceed (with extreme caution) when it is safe to do so. [Approaching an Intersection with Non-Operating Signal, Traffic Signals, Chapter 4: Traffic Signs and Signals, Indiana Driver's Manual]