Warning lights are attached to drums and barricades in a highway work zone. What is their purpose?
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A.
Signal that the arrow board is out of service.
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B.
Time the movement of workers across the pavement.
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C.
Mark the point where the work-zone speed limit ends.
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D.
Draw your attention to the drums and barricades. Correct
The answer is "Draw your attention to the drums and barricades."
Warning lights make drums and barricades stand out at night. Choice A is the trap for a driver who mixes up the two devices the manual introduces together on this page: arrow boards carry the lane-closure, caution, and merge-or-move messages, and warning lights carry none of them.
The traps in the wrong answers
A. Signal that the arrow board is out of service.
The manual gives warning lights only a visibility job for drums and barricades, and it assigns arrow boards to lane-closure, caution, and merge-or-move messages rather than device-status reporting. This answer reads every flashing device in a work zone as reporting the status of nearby equipment, carrying over the dashboard-icon habit of treating any lit indicator as a status signal.
B. Time the movement of workers across the pavement.
Warning lights sit on the barricades themselves; they do not time worker movement. Confused warning lights on barricades with a crew beacon that coordinates a moving work team.
C. Mark the point where the work-zone speed limit ends.
Warning lights mark obstacles, not the boundary of the work-zone speed limit. Assigned every work-zone light one job, missing that the speed-zone boundary is set by a posted sign.
This question tests your knowledge of Construction Signs in Illinois. Source: Illinois Rules of the Road, "Warning Lights and Arrow Boards," p.73..
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