Interesting - thanks for reporting on this. I'm guessing that the braking force you get depends on the level of regeneration you set, and the gear the car is in at the time. It's definitely a worry to me that I can be braking quite stongly, but the driver behind sees no warning light. I haven't been rear-ended yet, though, and I guess somebody must have investigated the safety angle before allowing the cars to be sold. Maybe??We just tested this yesterday...regardless of setting (1/2/3) the brake lights did not come on...and at lower speeds (e.g. neighbourhood 40km/h) level 3 will just about stop the car in short order. But I do notice that it depends on the level and speed you're going at. Eg. going along at 60km/h and lifting off with Level 1/2 doesn't seem to be drastic...but level 2/3 at 30km/h feels like you're hitting the brakes firmly. So same here...we're very conscious of what the person behind us might be seeing as we slow down without the tail lights on.