Earlier quoted context omitted.
>A few percent better than “humans” is quite bad Yes it should be (imho) at least an order of magnitude better than humans before we consider it OK to not pay attention. Not a few percentage points better as you say. However, to overcome media drama, it probably will need to be not just one, but more like three or four orders of magnitude safer than humans, because of the “oh look, a Tesla had an accident” effect.
Getting more than 50 percent better than humans gets hard, since frequently the accidents are the fault of the other party.
If you assume vans have about the same crash protection as cars and some van drivers are idiots then I'd guess you could get 10x better than the average human just through driving skill/technique.