I don't think "slightly safer" is enough. Slightly safer would likely be determined based on the average accident rate, but the problems lie farther out on the

I don't think "slightly safer" is enough. Slightly safer would likely be determined based on the average accident rate, but the problems lie farther out on the bell curve. It is one thing if, say, a driverless Model 3 hits a bus full of people: almost everyone involved woud probably walk away from that. But if a driverless Tesla Semi hauling two full trailers of heavy batteries does the same thing, the results would be horrific. Lawyers would appear out of nowhere, claim that people aren't perfect sure, but the trucking company took an undue risk on a technology with known flaws etc. Bad press everywhere, said trucking company then gets sued out of existence, etc. Given our litigious society, I think that driverless systems for big trucks need to be far far safer than the human-guided equivalent. When accidents happen, they have the potential to do far more damage.