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Question:

You arrive at a traffic signal that is out of order; it's completely unlit. What should you do?

A Stop as if you were at a stop sign.
Explaination

Under South Dakota law, if the traffic signal that you are facing has failed and is either red or unlit, you must treat it like a stop sign. That is, you must stop before entering the intersection, yield according to the right-of-way rules for stop signs, and then proceed (with extreme caution) when it is safe to do so. If the failed traffic signal is green or yellow, proceed with extreme caution. [Traffic Signals, Traffic Control Devices, Rules of the Road, South Dakota Driver License Manual], [SD Cod L § 32-28-8.2]