on the panel/screen in front of the steering wheel, the brake lights light up on the driving car when i apply the brakes. i was driving fast in ludicrous mode on the highway and let go of the accelerator, so regen 'braked' pretty hard and i didn't notice the brake lights from the inside. i sincerely hope the brake lights are in fact working, but i haven't been able to have someone else check it for me. its a serious safety issue if not, the regen can slow the vehicle very fast. i can easily see being rear-ended.