Originally Posted by SoCal 370Z

I'm dating myself here, but this was before YouTube's time, among others, and this system was based on the rapidity of flashes (what the OP is trying to do). The harder the braking the more flashes versus the intensity of the light that BMW is presently touting. The system was brilliant and really drove the point home. I could see where it would obnoxious after a while, but if you were to base the flashing activation only upon hard, and quick deceleration, then you would have a winner.