Learner drivers

I've met lots of new drivers on the road that I'd like to give a piece of my mind to, lol. I think that they should have a sign on all 4 sides of their vehicle for at least 6 months after they get their first drivers license, that way I think we would all be even more careful because we'd be anticipating driver errors more. One time I was following a driver's ed car down this country road. It was a somewhat busy road and there was no safe way to pass, so I just followed at a respectable distance. The driver's ed instructor had him stop in the middle of the lane and was going to switch drivers or something. I stopped, and waited. Next thing you know the instructor's waiving me around the stopped vehicle. No way! We were in a dip in the road, there was no visibility to see if any cars were coming from either way. It was safe to pass, and there were double yellow lines there because of that. I couldn't believe that an instructor would do that, that was teaching them nothing about safety! The incredible part was that at the top of the rise, clearly visible, was a large empty parking lot where they could have pulled in and done whatever it was they needed to do. As for your son, if it were me, I'd tell him that unless he follows the rules in your car you will not be letting him drive it. If you don't like the way he approaches lane changes, tell him. If he keeps doing it, don't let him drive for a while by taking away his driving privileges. You don't say how old your son is, but you are the parent, and by sitting there not saying anything, or doing anything, to correct this, you are in a way condoning it and saying it's acceptable to drive that way.