We're offering our inexpert advice in all things automotive.
We might discuss your question on our podcast. Yes, this means that we've run out of ideas for episodes and are too lazy to do research.
Edit: Thanks for the questions everyone. We didn't have time to answer all of them on the show but I'll try to answer all of them on here. The episode probably won't be out for over a month since we've got a backlog of editing to do.
If driver tests were more rigorous it would make it harder for people to get to work and the line would go down.
I don't really know what the advantage of air brakes over hydraulic brakes would be, except that they make cool noises