Maybe I'll just start, Madam Chair, then ask Ms. Diogo if she has anything to add in more detail. Fundamentally this is an issue that is always of concern. It's again one of the key elements that you need to think about in the safety of any transportation system. Typically you will have evolutions of the thinking. You'll have evolutions of the requirements and you'll have evolutions of the regulations, and that is triggered by a whole variety of new research that comes along, events that occur in the world, etc. That's the case certainly in rail safety and that has been the case over the last years. It's the case in other modes as well.
I think that the work has continued to go on, and I believe that, in the new safety management system regulations, there is a requirement for fatigue management plans that's been updated from the lessons and the learnings that we've had over the years.
Have you got anything specific that would be helpful?