I was thinking about this when I recently test drove a Tesla. The accelerator acts like a brake when you take your foot off, the de- acceleration is very harsh almost like applying the brake. Does this action engage the brake lights?
that is a very good point, and no, brake lights are not automatically applied despite very impressive regenerative braking. I have followed Teslas and been aware of this, enough to make sure you don't follow too closely, say, when thinking of overtaking. Tesla anoraks would be able to fill in more, but the dual motor types display the best regenerative braking, it used to be adjustable but I think they've started to remove this feature on some models.