replacement battery for nano ipod Growing up, I was always told it's a cost issue. Putting seatbelts on buses adds thousands of dollars to a district's budget, and would require extra maintenance, which would require even more money. That and the fact that a bus is so much bigger than other vehicles, that its added size and weight gives its riders extra protection, and seatbelts wouldn't really do anything. That might be a load of b.s., but I remember being told that by the teacher when we'd go on field trips.