Buses

What the hell is up with buses? I know what you are thinking.."what is so wrong with buses?" The problem with buses is mere fact that they are too damn big. Everyday I drive around and I see buses designed to hold like 150 people and shockingly there is only two people in the bus...the driver and the typical old man who rides all day long. Surely the bus will be jammed packed at some point having upwards of sixteen people, but what the hell are we doing paying for big ass buses that we dont need. I am basically a genius (not really) but cant we build smaller buses...that get better gas mileages and save us money. But no, everthing we do has to be irrational in some sense, so why could anyone ever do something logical. Buses....why are they so damn big?