And that's exactly why fully autonomous vehicles should never be allowed.
At the moment the systems the Mk8 has are quite primative, there is a long way to go before these things are truly capable.
Ironically the Mk8 has the start of it - Car2x is part of that future... once that has some more widespread uptake it should start to improve things.
Additionally, in just a few months time you will start to see MY22 spec cars started to be produced.... those will have mandatory speed limiters based on the same tech as I am describing, except you can't turn them off.
Once you get a critical mass of speed limited vehicles on the road, actually things become easier for everything else to work - not least of which is that even a Mk7 with DSG/ACC will be able to follow a speed restricted car quite happily, letting it do the work and you just keeping a safe distance back and at the speed limit - thats older simple tech.
On a slightly associated note, will madatory speed limiters kill the idea of a performance car? I think it might...