Back in the 90's the speed limit in Montana was "Reasonable and Prudent". That literally was the speed limit, and as long as you were travelling under 100mph you generally wouldn't get pulled over. Over that they would pull you over and advise you that maybe you should slow it down a bit. But they rarely gave out tickets, it was a fun place to drive back in those days...

signsbyjake.com
Not anymore, now the feds forced them down to 80mph... I do know some places in Texas have 85mph still.
Nice selections on Montana though, of course the first and last were country as to be expencted. I didn't know Chance Pena either, but he has a great voice. I liked that one! The second one was different, Schneider is an entertaining artist. Hadn't heard of him before either!
Great TTT for good old Montana. I spent a lot of summers in West Wyoming, West Montana, and East Idaho as a kid. The west is full of mountains and beautiful, the east is still the great plains and not a lot to see there. A beautiful state for sure worth visiting!
I kind of remember hearing about that with the speed limit now that you mention it. It's crazy to think about. Kind of like some of the roads over in Europe, but less curves I am guessing!