This signal means:

Flaggers are traffic control personnel who work in construction and maintenance zones, and their instructions must be obeyed over any traffic signs or signals. They are easily identified by their high-visibility clothing, such as bright or fluorescent vests.
If a flagger moves their arm holding a red flag up and down in a pushing motion, or displays a sign that says “SLOW,” it means drivers must slow down and proceed with caution.

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