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Question:

What must you do at a flashing yellow signal?

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A Slow down and proceed with caution.
Explaination

Flashing yellow signals are used to alert drivers to potential hazards. If you see a flashing yellow signal at an intersection, you should slow down, yield if you are turning left, and proceed with caution. [3A-1 – Color and Types, 3A – Traffic Signals, Section 3 – Signs, Signals and Markings, Nebraska Driver's Manual]