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More to the point, in North America, a school bus is very different from a city bus. It's yellow and has the single purpose of stopping only at each student's house and the school, after which it goes and parks somewhere* until it's time to drive everyone home at the end of the day.

It doesn't come back for you and there isn't another one coming until tomorrow.

*or switches to the next age range )which is usually staggered and in different buildings) or comes back to drive kids to field trips during the day