That's a really great observation and point.
Unfortunately, we're flying blind with respect to research and evidence here in terms of relative safety. Most of the studies that have looked at school bus crashes have not distinguished between full-size buses, minibuses, van combinations, etc. It would be very hard for me to advocate for one versus the other.
In absolute terms, if you're going to implement these policies, then I think we would have to think about them pragmatically and ask if it is reasonable to expect there to be seat belts and certain things in 47-chair buses versus smaller buses where it might be more feasible. That's not my area of expertise, so I can't speak to that. I think that's certainly a very valid point.
I would just echo that we aren't guided by.... There's not even that much research out of other centres. I looked through what's coming out of the U.S. and other places around the world, and unfortunately, there's certainly nothing distinguishing between full-size buses, minibuses and so forth.