I suspect this could be a really efficient way of working this. In much the same way that public transport - trains, busses etc. are more efficient. But I suspe

I suspect this could be a really efficient way of working this. In much the same way that public transport - trains, busses etc. are more efficient. But I suspect a big part of the answer is incentives. You have the Silicon Valley model, where Billionaires plow billion after billion into self-driving vaporware in the hope that one day they can force the entire middle class into serfdom. On the other hand you have city planners who literally could solve the problems of public transit if previously mentioned billionaires paid a bit of tax - but that's totally off the table don't be ridiculous. Efficient transportation in cities is communal, and built using tax dollars. That's not Silicon Valley sexiness.