Compensate for bad weather
Do these self driving systems take into account the poor weather? If there is snow or ice on the ground, does it know this? Will it continue to take a corner at the speed limit, or will it slow down because the road conditions are bad? Do the sensors work in a white out where you can trust that you are staying in lane because the lanes are covered in snow, and yours eyes can't see more than 20ft in front of you.
I guess that comes down to common sense, and I would not let the car take full control in those conditions, but what if some do. They then not only risk their but those in another vehicle.