Not every school system provides transportation, and when they do, some states (maybe all?) require that transportation be provided by a yellow school bus and n

Not every school system provides transportation, and when they do, some states (maybe all?) require that transportation be provided by a yellow school bus and not a city bus. (My father ran into this in Indiana). I'm gonna guess that in at least some of these areas, they walk/take busses because the school system doesn't provide transportation.