Right. I have, there are three in my town. You don't know what to do when you encounter one, do you?
I do, because it's actually documented. And prescribed by law. A "thanks for good driving" prize to the first other person on this board who knows what it is. (Betcha nobody in Tesla's self-driving team knows.) You're gonna laugh when you find out.
You honk your horn before you go around the blind corner...