For example - does the vehicle have to come to a full stop, as it can't safely proceed without an operator intervention? At busy periods, do they also have to wait for an operator to become available?
A busy junction could easily have 100 cars through it per minute. If two cars every minute stopped unexpectedly, that would hardly be scalable.
3.5M people work as truck drivers in the US, enough, in principle, to drive ~175M cars at the same time assuming 2% of cars need help at any given moment, ie ~60% of all the cars and trucks in the entire country being driven simultaneously.
Presumably though they'd be able to shave that down a few fold between where they are and dominating transportation nationwide (should they ever do so). So, it's pretty scalable in practical terms.
https://www.census.gov/library/stories/2019/06/america-keeps....
Can you clarify what you mean here?
