[devortel]

Not from the exterior. When full self driving beta mode is active, there is a circular, blue steering wheel icon visible at the top of the car's control screen. So unless you're inside the Tesla, you won't be able to tell.

[rsynnott]

I would not bet on this continuing to be the case, mind you. If regulators allow this sort of thing to continue at all, I'd expect warning lights visible to pedestrians and other drivers will be required.

[bdcravens]

I don't think we are far from legislation being required to mandate some sort of indicator. (if not outlawing these features)

[catlikesshrimp]

Yes, please. Just like "Driving instructor, keep your distance", a Tesla should say "Tesla FSD, slow down"