There's a gravel pit around the home parts that has that problem. There's rails but not high enough to keep semi tires from running over the top of rails and over the edge. Although they're high enough to give a driver a clue. Yet they still run over the rails.
Driving is like anything else. Some people can do it and others can't. I mean look at some of these people who drive cars. Some have had licenses for decades and yet can't seem to make it to the corner store and back without hitting something. The problem is that some of these companies will put anything with a pulse behind the wheel. No amount of training will ever fix stupid.