You see a yellow, three-sided sign with black letters, posted on the left side of a two-lane road. What does it mark?
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A.
The beginning of a no passing zone Correct
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B.
A two-way traffic warning is ahead
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C.
The start of a mandatory yield section
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D.
A left turn is prohibited on the road
The answer is "The beginning of a no passing zone"
The three-sided yellow pennant on the left side of a two-lane, two-way roadway marks the beginning of a no passing zone, matching the pavement markings on your side of the center line. Answer C, 'yield section,' is the trap: drivers who lump every three-sided sign together with the red-and-white yield triangle pick it, but yield signs use different colors and stand on the right, while the no passing pennant is yellow and always on the left.
The traps in the wrong answers
B. A two-way traffic warning is ahead
Two-way traffic is signaled by a different diamond-shaped warning, not by a three-sided pennant. This answer picks the roadway type the pennant appears on and treats it as the sign's meaning rather than its context.
C. The start of a mandatory yield section
Yield signs are red and white and stand on the right of your lane, not the left. This answer groups every three-sided sign under the yield family, forgetting that color and side of the road both change on the no passing pennant.
D. A left turn is prohibited on the road
Turn prohibitions use white regulatory signs at the intersection, not yellow pennants along the shoulder. This answer reads any left-side sign as a rule about left turns, taking the sign's position as its subject.
This question tests your knowledge of Warning Signs in Illinois. Source: Illinois Rules of the Road, "Shapes of Signs," p.64..
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