What kind of reference point does the manual say to pick when using the three-second following-distance rule?
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A.
A pedestrian or cyclist visible on the shoulder.
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B.
The rear bumper of the vehicle directly ahead of you.
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C.
A fixed object such as a sign, tree, or overpass. Correct
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D.
A truck moving toward you in the opposite lane.
The answer is "A fixed object such as a sign, tree, or overpass."
The manual names the reference point specifically: a sign, tree, or overpass sitting still by the road. Choice B is the trap, because a driver who has never used the rule reaches for the car in front, since that is the vehicle they are actually trying to stay back from.
The traps in the wrong answers
A. A pedestrian or cyclist visible on the shoulder.
People on the shoulder move and are not the still landmark the manual lists. This answer reaches for a roadside marker but grabs one likely to step, cycle or turn during the three-count.
B. The rear bumper of the vehicle directly ahead of you.
A moving bumper cannot measure elapsed time between your car and the vehicle in front. This answer uses the car in front as the marker, since that is the vehicle the driver is really trying to stay back from.
D. A truck moving toward you in the opposite lane.
Oncoming traffic moves, which defeats a rule that depends on a still marker. This answer picks something easy to see, forgetting that anything moving changes the count during the measurement.
This question tests your knowledge of Defensive Driving in Illinois. Source: Illinois Rules of the Road, "Chapter 11: Safe Driving Tips, Following Distances," p.83..
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