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There are a few reasons for this. First, red LEDs are brighter and cheaper than other colours. (LEDs are not actually more efficient than incandescents; they are more reliable, and save power where a dimmer light is acceptable.) Second, LEDs tend to shine in one direction, which is great for brake lights but not so great for turn signals. Third, the familiar clicking flasher won't (necessarily) work with LEDs, and some places require an audible indication, which the relay flashers provide 'for free'.
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