You approach a round yellow sign with a black "X" and the letters "RR." What is the sign telling you?
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A.
A radio-controlled traffic light is in use ahead
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B.
A rest area with restrooms is one mile ahead
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C.
A railroad track will cross the roadway ahead Correct
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D.
A ramp for large trucks is coming up on the right
The answer is "A railroad track will cross the roadway ahead"
The round yellow sign with a black X and the letters RR is an advance warning that a railroad track will cross the roadway ahead, and in rural areas it may be up to 750 feet before the crossing. Answer A, 'radio-controlled traffic light,' is the trap: drivers who treat every round yellow sign as a signal warning miss the manual's use of the crossbuck X and the letters RR to name a railroad.
The traps in the wrong answers
A. A radio-controlled traffic light is in use ahead
Traffic-light warnings show a picture of a signal, not a black X on a round yellow field. This answer treats any round yellow sign as a traffic-light warning, missing the crossbuck X that names the railroad.
B. A rest area with restrooms is one mile ahead
Rest areas are posted on blue guide signs, not yellow warning circles. This answer guesses at RR as an abbreviation for a rest-related feature, overlooking the manual's assignment of the letters to railroads.
D. A ramp for large trucks is coming up on the right
Truck ramps use dedicated signs; the round yellow sign with a black X and RR is a railroad advance warning. This answer reads the letters RR as a route or ramp abbreviation instead of the railroad reference the manual gives.
This question tests your knowledge of Warning Signs in Illinois. Source: Illinois Rules of the Road, "Shapes of Signs," p.63..
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