When does the Florida manual say flashing arrow panels are used in work zones?
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A.
Only when no flagger is stationed at the site.
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B.
Only in daytime, when visibility is high.
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C.
Only at night, when work crews are active.
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D.
Both during the day and at night. Correct
The answer is "Both during the day and at night."
The manual says flashing arrow panels are used both during the day and at night. The nighttime-only choice comes from treating any lighted panel as a nighttime device, but the manual keeps the arrow panel in service through the daylight hours of a work zone.
The traps in the wrong answers
A. Only when no flagger is stationed at the site.
The manual sets no substitution rule between the panel and a flagger. This answer invents a swap-out rule between two work-zone controls the manual treats separately.
B. Only in daytime, when visibility is high.
The manual keeps the panel in service at night as well as during the day. This answer assumes a lighted panel is unnecessary in daylight, missing the day-and-night rule.
C. Only at night, when work crews are active.
The manual puts the panel to work in daytime hours too, not only at night. This answer treats any lighted panel as a nighttime-only device, ignoring the daytime use the manual names.
This question tests your knowledge of Construction Signs in Florida. Source: Florida Driver Manual, "Construction/Maintenance Signs & Signals," p.54..
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