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Question:

You see an octagonal sign at an intersection. What must you do here?

A Stop and yield to traffic
Explaination

The STOP sign is the only sign with an octagonal shape. You must come to a complete stop before a STOP sign and yield to all pedestrians and vehicles before you proceed. Stop before the marked or unmarked crosswalk. [STOP, Chapter 5: Signs, Signals, and Markings, Oklahoma Driver's Manual]