Commercial truck drivers are subject to different rules. They used to have a bunch of problems, like taking speed and driving for ridiculous stretches. Apparently, the rules in the states are 11 hrs/day max w/ 3 hrs of rest breaks [1].
My mistake, well I certainly don't remember learning anything about legal driving limits- I'd be shocked if those were laws and not some agencies guidelines.
It’s actually kind of crazy that limits don’t exist as it has been demonstrated that lack of sleep is essentially equivalent to driving inebriated at a certain point. I suspect it’s only the logistics of enforcement that prevent it from happening.
1. https://www.indeed.com/career-advice/finding-a-job/how-many-...