Major differences of Bus/Tram/Metro vs Car (robo or not) is number of passengers that can be transported per "time"/"dolar/"citi space used". And my feeling is

Major differences of Bus/Tram/Metro vs Car (robo or not) is number of passengers that can be transported per "time"/"dolar/"citi space used". And my feeling is that cars are not on the wining side here. And remember Bus/Tram/Metro can also be driverless.