It's not a question of miles, it's a question of scenarios. A car that takes on the entire interstate highways system but suffers no "close-calls" is practicall

It's not a question of miles, it's a question of scenarios. A car that takes on the entire interstate highways system but suffers no "close-calls" is practically untested, IMO. Also, that car never "experienced" rush hour in crazy places like downtown Cairo or the old&narrow streets of older Italy.