Perhaps one might need to check the number of miles of straight Interestate Highway System sections where unlimited speed is okay for passengers. One then would next see how many remaining sections could maintain the same speed in an acceptable banking arrangement.
That would leave the problem areas. One could either slow down the traffic or reroute the roads. The later requires the acquisition of new right-of-ways. Slowing down is the cheap alternative, and probably perfectly acceptable.
In some areas it will be necessary to get new right-of-ways no matter what. Straightening out some of the existing roads will solve the problem of slow-down congestion.
But let us not forget that the slowest section will still be much faster than any other mode of ground transportation. Imagine a slowest speed of eighty MPH handsfree. There simply isn't any downside.
By the way, unwanted visual cues can be removed by darkened or shaded windows.
ABB?