How may the posted work-zone speed limit change when workers are present?
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A.
It is lifted while workers direct traffic.
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B.
It is doubled to give flaggers extra room.
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C.
It may be further reduced. Correct
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D.
It is set to zero until workers step aside.
The answer is "It may be further reduced."
When workers are on-site, the posted work-zone speed limit may drop even lower. Choice B is the trap for readers who blend the doubled-penalties idea from work-zone safety campaigns into the speed number itself, but the manual reduces the limit, never doubles it.
The traps in the wrong answers
A. It is lifted while workers direct traffic.
The presence of workers tightens the limit; it does not lift it. This answer treats a flagger's authority to stop traffic as suspending the posted speed limit for the whole work zone.
B. It is doubled to give flaggers extra room.
Penalties can be increased in work zones, but the speed limit is lowered, not doubled. Blended the doubled-penalty concept from work-zone safety campaigns into the posted speed number itself.
D. It is set to zero until workers step aside.
A zero speed happens only when a flagger signals a stop, not from the sign alone. Took 'further reduced' to mean reduced all the way to a full stop when the manual only softens the number, not zeros it.
This question tests your knowledge of Construction Signs in Illinois. Source: Illinois Rules of the Road, "Construction Zones," p.25..
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