Except at night to not wake you up they might not have the horn blaring then. But they also understand how much faster to go, when to have the horn enabled even at night, know to approach a red light slowly even if they have right of way and you are supposed to let them pass etc.
* El Paso to Dallas is 635 miles, driving the whole way at 85 mph would take 25 more minutes than driving the whole way at 90mph. The reality is even further in 85 mph's favor because you aren't able to sustain 90mph the whole way and we're only going slower when we would be able to.