I'll just add that what Mr. Mackay is referring to is the work-rest rules. They do provide a framework for regulating work scheduling. What you can really only expect to manage is the schedule and the provision of time off. You can't regulate fatigue per se because you can't regulate what people do with their spare time. You can't regulate nutrition habits and all the other things that go into a fatigue management plan.
When we talk about fatigue management, we apply the most advanced science on the subject that there is, really, in the world. It comes out of Australia, and it looks at analyzing work schedules and identifying risk areas as to whether or not the schedule is providing adequate opportunity for rest. But it's very much a shared obligation on industry to provide work schedules, but also on employees who participate in it to take rests when they have those opportunities.