Motolight makes a pair of lights that mount either to the calipers or to other places. I have my BMW equipped with it and the cars definitely seeing it coming. Motolight describes the phenomenon as a "triangle of light" where your headlight is at the pointy tip of the triangle and the other Motolights form the base.
I know that it works because the first time I saw it was from a motorcycle coming up behind me driving my cage and I was like, "WTF was that?"
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Cogito Ergo Vroom - I think therefore I ride
 
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