Drivers are required to obey instructions from:
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Traffic lights only.
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Flaggers (signal persons) at construction sites.
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Other drivers whose vehicles are broken down on the roadway.
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Security guards patrolling parking lots.
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Explanation
Drivers are required to obey instructions from flaggers at construction sites as they have authority over traffic control devices. Signs, message boards, cones, drums, and other barriers will guide you through the work zone, but if a flagger is present, their instructions must be followed.
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