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Iowa Class C Knowledge Test Practice
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Passing target: 20/25 correct (TLA practice target)
Warning, Construction & Information SignsStandalone practice
A round yellow sign displays a black X and the letters R R. What is ahead?
Correct answer: A railroad grade crossing.
Why
The round railroad warning gives time to slow, look, listen, and prepare to stop for rail traffic.
Verified against Iowa Driver's License Manual · Standard Shapes · p. 7
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