I know it is ridiculous. But it's the convention here. What to do, yanni? so for expatguy to pursue his case is a no-win situation. That is why I said forget it and charge it to experience.

Also, another subtle road rule, I see so many expatriates on the fast lane driving within speed limit. Great! But when a fast approaching vehicle comes (sometimes with flashing lights), they stay on that lane thinking they are right since they are within speed limit.
The right thing to do is to let the fast moving vehicle through. It is the other vehicle's problem if he defies the speed limit. Just let him pass and then go back to the fast lane if you wish. There is no point of trying to impose the speed limit on another vehicle by using your own car.