Traffic signs and pavement markings must be:
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Followed only when a police officer is present.
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Always obeyed.
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Used as a guide only.
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Followed only when other vehicles are present.
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Explanation
Traffic signals, signs and pavement markings are used for traffic control to provide a smooth, orderly flow of traffic. Always obeying all signs and signals is important to ensure the safety of all drivers, passengers, bicylists and pedestrians on the road. The only exception to obeying all traffic control devices are special situations when directions from a law enforcement officer or other emergency personnel take priority.
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This question appears in the following DMV practice tests: