Rapid Bus Transit[1] systems seem to be a good way to combine high capacity with (almost) guaranteed transit times and much lower costs than building rail, let

Rapid Bus Transit[1] systems seem to be a good way to combine high capacity with (almost) guaranteed transit times and much lower costs than building rail, let alone subway systems. [1] https://en.wikipedia.org/wiki/Bus_rapid_transit https://en.wikipedia.org/wiki/Bus_rapid_transit