I think it's probably a bit of everything.
When you work in the labour movement, you know that you get the answers by asking workers what they think. That's what we did, and they're telling us that these are the things that are keeping new workers from coming in. These are the worst parts of the job that are getting to where it's at a breaking point.
I'm guessing some of these were way better. For example, we talk about rest stops. It's an infrastructure issue. If the economy moved a certain way so that there are way more trucks on the road—which, from what I understand, is the case—and no one ever took to improving the rest stops for trucks, then you just reach a breaking point. You reach a crisis. I think it's probably a combination of a lot of things.