Big truck drivers can be scary but they can also be good "enforcers". The best thing I saw was at a backup because of a closed lane on a two lane road. Of course all the people in a hurry where driving in the closing lane to get to the front of the backup and slowing down everyone else. So one truck/lorry drive drove in the closing lane right next to a truck driver in the non-closed lane- blocking the line jumpers. Somehow you can't pull off this kind of road justice in a small car, but in a big truck you can get away with it.