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The strobes embedded in (or mounted above) a traffic signal is intended as an attention getter. (They're generally used more often in rural areas.) Inattentive drivers will sometimes drive right through a red light - particularly if it's been red the entire time it's been in their view. The human visual perception system is geared to notice changes, so a static red is more difficult to perceive than a light that has changed from green to amber to red.

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Q: What is the purpose of the strobe light within the red traffic light?
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What is the purpose of a car strobe light?

A car strobe light is used to get someones attention such as when a police officer is pulling someone over. It is also used to warn of danger or to get out of the way such as when an ambulance is hurrying by.


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