The ugly part of this is that if drivers get used to self driving in reasonable weather then, in the one percent of the time (or less) when conditions get real

The ugly part of this is that if drivers get used to self driving in reasonable weather then, in the one percent of the time (or less) when conditions get really horrible, their driving skills won't be up to the challenge. However as self driving becomes common investment will be made to make roads easier for self driving technology and extend the technologies usefulness. Even now in snow storms when temperatures are just below freezing human drivers have a hard time coping. If self driving just has to do better than that. It doesn't have to be perfect.