Because bus crashes in Canada are so rare...an upcoming study is looking at the last decade and specifics around the actual crash. I wish the results were published; they're coming in the next couple of months. In the absence of that, we do know that it's very rare, one or fewer fatalities per year over the last 20 years, which is, I think, very positive. When it does happen, the bus has been travelling at a higher speed more often than not.
On April 2nd, 2019. See this statement in context.