Throughput doesn’t change with speed, just like with cars the rate is the same at 5 or 75MPH because the spacing in terms of time stays constant. What improves

Throughput doesn’t change with speed, just like with cars the rate is the same at 5 or 75MPH because the spacing in terms of time stays constant. What improves is the latency for individual riders, and the reliability of the bus arriving on schedule.