For a while, IIRC back in the '90s, Montana had no speed limit on some roads. Though they did say if you were in the triple digits you were probably likely to

For a while, IIRC back in the '90s, Montana had no speed limit on some roads. Though they did say if you were in the triple digits you were probably likely to get a ticket. I drove it several times during that, and the big limit was "How fast can I go and still make it to the next gas station?" It was a beautiful drive. They added the speed limit back (again IIRC) because someone got several tickets and sued saying (along the lines of) "there's no way I can tell if I'm going too fast without the speed limit".