Have you ever been in a moving big-rig at 65 mph? It's terrifying to be a passenger; you can only imagine the balls it takes to pilot one. If you don't think it's any scarier than driving to work, you should talk to a trucker. Ever hear of a runaway truck lane? You think a truck driver going over the Rockies in pitch black night with nobody around doesn't have to overcome a sense of self-preservation?