Earlier quoted context omitted.
> The economies of scale you get by packing people in larger vehicles mostly have to do with the cost of fuel and staffing. Trains (and train-like options such as metros) are vastly more efficient than cars in number of people moved per unit of time per area used. That might not be a big deal in suburbia, but in dense inner cities it's one of the most important drivers of public transport.
Autonomous vehicles could chain up or drive really close together and achieve similar space efficiency. Also, if you look at a train track. It's mostly empty space with a train passing occasionally. Very different than a well used road. And autonomous vehicles could collaborate to counter any congestion. What makes trains efficient has more to do with the cost of energy and drivers than anything else. Both of those g…
And energy isn't free. If we had any intention of becoming net zero, electricity prices had better increase. And driving around 2t empty weight isn't the way to get there.
Incidentally, a trip that's less than 1 kWh (so, less than 6 km) is a trip that could easily be made on foot or by bike.