It's not just the quantity; it's the overall efficiency, of quantity compared to the cost of infrastructure and operations. Buses hold more but cost a lot more

It's not just the quantity; it's the overall efficiency, of quantity compared to the cost of infrastructure and operations. Buses hold more but cost a lot more to build and drive, including stations and maintenance facilities, and externalities like emissions and gridlock. Bike infrastructure is cheap and operations are free to a city.