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When looking in the direction of travel, going fast enough (we are talking about speeds no human has yet achieved) red (long) wavelengths will shorten towards the blue (short) end of the spectrum. This is observable in a few astronomic cases.

Making red actually appear blue (instead of just slightly orangish) is going to require an extremely high speed (by terrestrial standards); going from a 650 nm red to a 475 nm blue would take around 30% of the speed of light, or about 60,000 miles per second.

In other words: while this may get you out of a traffic ticket for running a red light, the fine for exceeding the speed limit by that much will undoubtedly exceed the global gross economic product for the next millennium or so.

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13y ago

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