Both Mercedes and BMW have already developed this system, and a few years back BMW actually put a few mule 7 series on the roads of Southern California (there was an article in one of the major automotive magazines about it, but I've forgotten which one). I had the privilege of meeting up with one of the mules on I5 and we played tag for several miles. I have to say that I was extremely impressed with this system. Their intensity model was based on several more steps regarding the brightness aspect.
California law allows a series of three flashes, but I do not think that intensity stepping has been approved on a Federal level yet. Anyway, the idea in real-life is a life saver and our Zs' can benefit from such a measure. I have a theory that I adverted to in the past here of why other drivers' tailgate the 370Z and intensity braking would resolve my theory.
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