It's very difficult for me to say whether it's being addressed properly in a piece of legislation, as I'm not a legislator. However, I'm happy to offer an opinion on dangerous goods.
It really depends. The two things that we have are frequency and severity. We have a number of models out there that target TIH/PIH as a very difficult commodity with regard to the aspect of severity, but there are very few and falling shipments of that. As was noted, crude by rail has been on the increase but has started to flatten out.
Looking forward, it's very difficult to rate them as one through four or something like that, but as was alluded to by Robert, one accident is too many. The crude-by-rail accident at Lac-Mégantic was very severe. The TIH accident in Graniteville, South Carolina, 10 years ago, was very severe. It's almost, dare I say it, a tie. They're all severe and one accident is way too many.