A detour sign is typically posted:

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To remind drivers that they must obey the directions of flaggers in a work area.
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If slow-moving construction equipment is on the road.
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When road work requires full closure of travel lanes in one direction.
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None of the above.
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Explanation
Black-and-orange Detour signs are posted when a road is temporarily closed due to construction or maintenance. These signs mark the beginning of an alternate route that directs drivers around the closure. Detour signs may be rectangular or diamond-shaped, and they include arrows to guide traffic back to the original route. When you see a detour sign, do not continue on the closed road - follow the posted directions to safely bypass the work zone.
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