I find the focus on safety with respect to driverless cars to be weird. That's the easy part. Don't drive into stuff. Pretty sure technology can handle that. That doesn't mean they'll necessarily enhance safety overall. Robot cars that don't drive like humans do might cause problems. But the easiest thing is programming them to not drive into things.
They're still not going to work any time soon, not as promised anyway. The "take me anywhere I want to go" driverless car isn't going to happen in my lifetime. Enhanced cruise control, sure. I'm just not entirely sure of the benefit of that.