If a traffic signal light is green and a police officer signals you to stop:
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You must stop.
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You should obey the traffic signal.
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You can tell the officer that signs and signals take precedence over directions given by traffic officers.
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You must proceed with caution.
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Explanation
Signal lights are placed at many intersections to regulate the flow of traffic. Drivers must obey the signal lights unless a police officer is directing traffic to do otherwise. Directions given by traffic officers take precedence over signs, signals or pavement markings. This means that even if a traffic light is green, you must stop if a police officer signals you to do so.
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