They'd be riding in a regular yellow school bus and I told the preschool today they wouldn't be going because of the seat belt issue and they just said, "oh" So I'm assuming there are no seat belts on the school buses? There weren't when I used to ride them.
That's why I'd call the bus company - we live in hicksville, and our state has horrible child passenger safety laws, which is why I was so surprised to find out that the regular yellow school buses for the field trip would have belts & harnesses. The teachers knew NOTHING about it beforehand because it was the first years they'd had them. We wound up leaving an HOUR late for the trip because they had to call in another bus to get all the kids situated; some were big enough to ride in just the lap belts, but only half the seats in the bus had those, etc. They had quite the time sorting it out. (And BTW, I'd have driven us if they hadn't had a lap-belt available for my daughter's carseat - I understand your concerns and I'm not trying to talk you out of it! Just sharing my experience.
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I'm wondering, though, now that I'm certified if this wasn't done in preparation for a bill that didn't pass. I haven't heard anything else about the kids using harnesses/belts on the buses, but then none of my kids is going to school at this point, either.