You are driving out of a construction zone after passing the last workers. What does the manual say about your speed?
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A.
Keep the reduced speed for one mile past the last barricade.
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B.
Keep the reduced speed until you are safely past any workers or authorized vehicles. Correct
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C.
Return to the posted highway speed as soon as you pass the last worker.
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D.
Speed up once you can no longer see any workers.
The answer is "Keep the reduced speed until you are safely past any workers or authorized vehicles."
The reduced speed sticks with you until you are safely past both workers and any authorized vehicles. Choice C tempts drivers who scan for the last visible worker and reset speed there, but the manual holds you to the reduced speed past the authorized vehicles too.
The traps in the wrong answers
A. Keep the reduced speed for one mile past the last barricade.
The manual sets the reset by position past workers or authorized vehicles, not by a fixed distance. Invented a one-mile buffer to remember, a common shortcut for rules that lack a clean numeric anchor.
C. Return to the posted highway speed as soon as you pass the last worker.
The reset applies to authorized vehicles as well as the last visible worker. Used the last worker in view as the reset cue and dropped the authorized-vehicles half of the sentence.
D. Speed up once you can no longer see any workers.
The reset is keyed to position past workers and authorized vehicles, not to your line of sight. Treated line-of-sight as the trigger, a habit built from open-road following-distance judgments.
This question tests your knowledge of Construction Signs in Illinois. Source: Illinois Rules of the Road, "Construction Zones," p.25..
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