A round yellow sign with a black X and the letters 'RR' means:
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A.
A railroad crossing is ahead; look, listen, and prepare to stop. Correct
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B.
A busy intersection is ahead; yield to any cross traffic.
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C.
A pedestrian crosswalk is ahead; watch for people on foot.
The answer is "A railroad crossing is ahead; look, listen, and prepare to stop."
The round yellow sign with a black X and the letters RR warns that a railroad crossing is ahead; look, listen, and prepare to stop. Choice C pairs the yellow warning color with the pedestrian-crossing sign, another yellow warning most drivers meet far more often than a rail crossing.
The traps in the wrong answers
B. A busy intersection is ahead; yield to any cross traffic.
The round-and-X design is reserved by the manual for railroad crossings, not for any type of intersection warning. This answer reads the X on the sign as a crossroads symbol because railroads and intersections both involve two paths meeting.
C. A pedestrian crosswalk is ahead; watch for people on foot.
Pedestrian crossings use a yellow warning sign with a walking figure, not a round X-shaped sign. This answer matches any yellow warning to the pedestrian-crossing rule because that sign turns up on almost every city drive.
This question tests your knowledge of Road Signs in California. Source: California Driver Manual, "Yellow and Black Circular Sign or X-shaped Sign," p.38..
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