> You can tell it's low because it's measured in "per billion vehicle-km".
No, you can't tell it's low because of that at all. What it means to be "good at driving" is entirely relative, just as what it means to be "low" is.
7.1 fatalities per billion vehicle-km is still a lot if you expect there to be 1 fatality per billion vehicle-km... Or if you expect there to be 0... The general idea is that machines could get that number much lower, and so - if that's your measurement of quality - are much better...
> You can tell it's low because it's measured in "per billion vehicle-km".
No, you can't tell it's low because of that at all. What it means to be "good at driving" is entirely relative, just as what it means to be "low" is.
7.1 fatalities per billion vehicle-km is still a lot if you expect there to be 1 fatality per billion vehicle-km... Or if you expect there to be 0... The general idea is that machines could get that number much lower, and so - if that's your measurement of quality - are much better...