Lots of people are arguing about 'when full self-driving cars will happen' without giving a precise definition (and therefore without having to think too hard a

Lots of people are arguing about 'when full self-driving cars will happen' without giving a precise definition (and therefore without having to think too hard about the problem). The article describes Level 5 as 'full computer control of the vehicle with zero limitations' but what exactly does that mean? (a) Does it mean a vehicle available for sale to the general public that can drive at night when it is snowing on a new road that has not first been mapped by a human? or (b) Does it mean that there is at least 1 city of a million residents where at least 50% of vehicle journeys did not require any occupant to have a driver's licence? To me (and Volkswagen) it's far more useful to forecast when the second criteria will be met than the first.