The correct answer is; They will override and take precedence over any road signs.
Further Explanation:
When there is a construction flagger or traffic police officer on the road, their instructions will the rules to follow and not the road signs. Many times the flaggers are on the scene because there is road work or a crash site ahead. There are numerous types of gestures and signs that the flaggers may use at any given time.
It is very important to slow down when there are traffic police or construction flaggers as they are often in the middle of traffic and this is very dangerous. When the flagger puts one hand up and outstretched towards oncoming traffic this means to stop. The flagger will then use the other hand to signal with a finger/fingers for the other traffic to move.
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