To this point I wonder how full autonomy will impact this. A truck that drives itself and doesn't have to stop (besides to charge) will easily make the case for a freight or autonomous lane on highways where the vehicles don't go above a certain speed (67mph or 100kph). I don't really care if it takes me 10 hours to go 500 miles if I watch a movie, go to sleep, an wake up in front of my hotel.