This does not appear to be true, do you have any research?
> road safety could be improved way better with other improvements (better education, harsher fines, lowering and enforcing speed limits)
This also does not appear to be true. It's like saying humans can get better than computers at Go if you push them hard enough. And we know that's false.
> environmental impact decreased by moving away from motorized transportation etc.
While i agree, i can point out that a self-driving car will mean less cars (as it can be shared), so it will be more environmental efficient than private ownership of cars.