Comment by ptaipale

This is common in newer cars in Europe - if you brake so hard that ABS is activated, the brake lights will flash / pulse.

I suppose regulations do not allow it in the U.S. but at least here it can be programmed on/off via service terminals.

Random example from YouTube: https://www.youtube.com/watch?v=dJk-rJpgF1o&t=108s