You know, that's a valid question and one that I've had concerns about before myself. The only thing was that it was my husband driving the bus. While he was still teaching in the classroom (in admin now), he drove a school bus for extra income.
I had concerns about his having to be alone on the bus with any student. In this day and age, you never know what you can be accused of - particularly when you are in authority and sometimes have to discipline students (in a world where more and more people have major issues with following any kind of rules).
I know someone personally who took up a student's cell phone that was going off in class (the school had a policy prohibiting phones at school). The parent called and wanted the phone back. When told no, they hung up but called back literally 90 seconds later accusing the individual of molesting their child. I kid you not. Fortuately, that school has cameras everywhere, and the accusation didn't go anywhere.
My husband was very, very happy when he quit driving a bus. I don't guess this is exactly what the OP meant, but there are two sides to everything.
(No disrespect meant, OP.)