Not sure what kind of car you drive, OPM, but for any decent touring sedan, 100mph on open road feels no different than 60mph. I've personally hit 140 on a nice open stretch of highway in Southern Mississippi on the way to New Orleans last year and it was a bit spooky, but still a shockingly smooth ride. We averaged right at 100mph on the trip and the only time things even felt remotely unsafe was when we pushed past 120ish.
Absent much traffic, modern cars are easy as hell to drive 100mph on well maintained freeways.