> What is the ratio of empty space between trains on a subway? I guess you conveniently forgot that because you were swept away by righteous moralization

What's the ratio of empty space between cars on a highway? Doing some math (2000 car/hr * 4.8m/car / 100 km/h), it comes out to empty space taking up about 90% of a highway at (throughput) capacity. Running the same numbers on NYC subway trains, a track at capacity would be about 85% empty.

So subways on average, use more of their space than highways do.