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Michigan Operator Knowledge Test Practice
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Passing target: 8 correct signs and 24 correct rules (TLA practice targets)
Warning, Construction & Information SignsStandalone practice
A yellow circular sign displays a black X and the letters RR. What does it warn of?

Correct answer: A railroad crossing ahead.
Why
The round RR warning provides advance notice of railroad tracks so a driver can scan and prepare to stop.
Verified against What Every Driver Must Know · Round yellow warning signs · p. 49, 55
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