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Question:

What does this sign mean?

A There is a railroad crossing ahead.
Explaination

There is a railroad crossing ahead. Prepare to stop if you see a train coming. You must also stop if you are directed to by a set of red flashing lights, a sign, a traffic officer, or a lowered gate. [Shapes of Signs, Road Signs, Section 7: Signs, Signals, and Markings, Georgia DDS Drivers Manual]