Brake light activation on the i3

The i3 regenerates aggressively. As soon as I let my foot off the gas pedal, it slows forcefully. If I time it right, I can get around town without ever using the brake pedal. But paranoid-me thought: Can people behind me tell if I'm slowing down quickly? The answer is yes. The brake lights sometimes go on even when I don't have my foot on the brake pedal.