On a highway shoulder, a large electronic arrow board flashes arrows pointing right. What is it telling drivers?
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A.
An emergency vehicle is approaching from the rear.
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B.
The construction zone speed limit has just ended.
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C.
A lane closure is ahead and drivers should merge to the right. Correct
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D.
A flagger is stationed around the next curve.
The answer is "A lane closure is ahead and drivers should merge to the right."
Arrow boards warn of an upcoming lane closure or caution about construction ahead, and they show the direction to merge or move; arrows pointing right mean the right-hand lanes are open and you shift that way. Drivers who pick choice B are carrying over the END CONSTRUCTION rectangular sign from the guide-sign section and reading any lit panel beside a work zone as the marker that the zone has finished.
The traps in the wrong answers
A. An emergency vehicle is approaching from the rear.
The manual does not use arrow boards to warn of approaching emergency vehicles; those are signaled by sirens and light bars, not by stationary shoulder-mounted arrow panels. Treats any flashing amber arrow as an emergency alert, a reflex carried over from the arrow-shaped light bars on tow trucks and utility vehicles working the shoulder.
B. The construction zone speed limit has just ended.
An arrow board points into an open lane and gives the direction to merge; the end of a work zone is announced separately with an END ROAD WORK sign, not a flashing arrow. Reads any lit panel beside a work zone as the marker that the zone has finished, borrowing the habit from static END ROAD WORK signs seen at the exit of prior construction zones.
D. A flagger is stationed around the next curve.
A flagger-ahead sign is a diamond-shaped warning sign, not a flashing arrow board; the manual assigns arrow boards to lane movement and closure warnings, not to flagger location. Lumps every work-zone warning device into one category and picks the nearest human role because a person feels like the natural reason lanes suddenly shift.
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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