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Question:

What must you do at a steady yellow traffic light?

A Prepare to stop for a red light.
Explaination

A steady yellow traffic light is a warning that the traffic light will soon turn red. Prepare to stop for a red light. (Never speed up to try to "beat the light" before it turns red.) But don't stop suddenly and risk getting rear-ended by the vehicle behind you. If you cannot stop safely, proceed with caution through the intersection.