[oftenwrong]

In my city, the subway trains can carry ~1400 people. During peak commuting times, a train comes every 5 minutes or so. Even our largest buses only carry ~100 people. You would need a bus to stop every ~21 seconds to match that capacity. That rate probably can be achieved. Stops would have to be designed to reduce the overhead of disembarking/boarding cycles, since there would be ~14x as many as with a train.