Why does Infrared show up purple in digital cameras?

Are there cameras installed on those new digital speed display boards that show your car's speed?

  • I was driving by one of those digital speed display boards near a school zone and the speed display showed that i was going 30 mph and told me to slow down. About a second later, a ...show more

  • Answer:

    that is the radar gun mounted inside, if you stop at one you can see where it is at..

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