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Why Are Police Car Lights Red & Blue?

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Police Car Blue Red Emergency Lights Cop Vehicle Colors

Few things will make your stomach drop more quickly than seeing bright red and blue lights flashing near you when you’re driving—not just in your rearview mirror, but anywhere in your peripheral. It’s undeniable that we’ve come to associate the pairing of those two colors with law enforcement or other emergency vehicles. They quickly and effectively grab our attention when we see them.

How were these two colors chosen for the identification of police vehicles? Is there any meaning behind the choice of red and blue?


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Explaining the Reason for Red and Blue Emergency Vehicle Lights

The use of special lights to identify law enforcement vehicles has been going on in some form or another for at least 70 years. Back in the old days, small spotlights were used to get the attention of civilians and other drivers nearby. But as technology developed, cars on the road changed, highways emerged, and cities became brighter, it became necessary to use more evolved light systems. Eventually, blue and red color bars were decided upon, projected in ways so they could be seen from every direction.

How red and blue specifically were chosen is ultimately unknown for certain, but there are plenty of respected theories:

  • People already associated red with urgency and importance, seen on stop signs and traffic lights, so its inclusion on emergency vehicles followed that pattern.
  • Red lights can easily be seen at night or during the day (one of the reasons brake lights are red).
  • Blue has become synonymous with the police, even outside of vehicle lights (blue uniforms, logos, etc).
  • People who are colorblind to red can often still see blue clearly, and visa versa.
  • The inclusion of blue adjacent to red helps differentiate it from a sea of red brake lights, traffic lights, and flashing intersection lights.
  • The colors are on opposite ends of the color spectrum, and their juxtaposition is jarring.

Studies in recent years have raised criticism to the traditional flashing red and blue lights. The rapidly flashing pattern has been known to trigger epileptic episodes in bystanders. Also, the use of red has been shown to trick people into thinking the light is moving away, rather than coming toward (due to its wavelength and frequency). For such reasons, many police forces are replacing red with amber lights, or just relying on only blue.


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Sources: Police One, Autoevolution, Speed Tech Lights