The problem Tesla has is that their system only has ~ 40 meters visibility to back or front.
That means if you're on the Autobahn, at say 130km/h in the right lane, and a Porsche is coming from behind at 300km/h, the Tesla will not be able to see it, and consider the lane free.
It’s quite interesting, because obviously an entirely different class of issues becomes apparent when the speed between two lanes on a highway can differ by a factor of 4.
This is what you get when the speed limit actually is "unlimited".
That means if you're on the Autobahn, at say 130km/h in the right lane, and a Porsche is coming from behind at 300km/h, the Tesla will not be able to see it, and consider the lane free.