You've seen it all, and there are still hours to go. One can only scan the empty horizon so many times before the scanners turn off due to lack of stimulus. Then you are left again with whatever is in your head. This is a place to think. There are not even the distractions of curves.
Straight roads seem to beget straight thoughts.
Playing on the words of the old Geritol commercial, 'my life, I think I'll keep it'. The only real fun comes after a construction road stop. Although you rarely ever see another vehicle while on the road, when traffic is stopped a surprisingly long line forms. Then one by one we pick off each 70 mph snail ahead of us. High speed in the open desert just doesn't seem fast.