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Question:

You arrive at a traffic signal that is broken; none of its lights are on. What should you do?

A Treat the intersection as an all-way stop.
Explaination

When the traffic signals are not working, treat the intersection as an all-way stop. You must stop, yield, and only proceed (with extreme caution) when it is safe to do so. [Traffic Signals, Chapter 10: Traffic Signals and Pavement Markings, Illinois Rules of the Road]