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This feature would be great if it were implemented on ALL cars so that drivers could learn and get used to what the extra and flashing lights are for.
BMW doing this just on their cars doesn't do much good other than perhaps get some drivers attention who is behind a BMW...maybe.
The real advancement is using LED brake lights that light up to full brightness faster than standard incandescent bulbs. That fraction of a second to full bright advantage of LED brake lights has been demonstrated to catch drivers attention better.
Coming up to full brightness results in the driver behind the car actually responding a fraction quicker and that can help avoid certain accidents.
Judging from the testing LED brake lights should become a standard requirement in all cars, as a safety feature.
BMW's idea is a good one but needs universal application.
Having a standardized brake lighting set up could help all drivers better judge the braking of the car/s in front of them.
If there were 3 standard lights in every brake light, then the 1st light comes on with light braking like lightly tapping the brake in anticipation or adjusting speed.
The second light comes on during normal braking such as slowing for a light or stop sign.
The third light would come on during a heavy braking situation, calling attention to a potential emergency braking situation.
And there could even be a flashing brake light that would be directly stating,
"FULL BRAKE NOW!"
As it is now with most all cars the brake lights come full-on whether the driver is just one of those arbitrary brakers, who step on their brakes for no known reason, or for an emergency stop. I like the idea of graduated brake lighting combined with the speed to full brightness of LED's.
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