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And, technically, would the color of the light change at different car speeds?

HAL9000
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As far as our latest theories go, the speed of photons is going to be "c" only as they move with speed of light irrespective of your point of observations.

the color factor depends on the original color that was emitted and then the application of dopplers effect for the shift in apparent wavelength and hence color due to velocity of approach of car, however in real life it is insignificant and whatever color is emitted is what we see.

Rijul Gupta
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