Here in Norfolk UK, the full beam drivers are often older folk who can't see properly in the dark on dipped headlights. There is very little lighting on our rural roads, and the daft old buggers have to put their lights on full beam to see anything at all. Another trick they have is to use a driver in front as a pilot, and tailgate him/her as closely as possible as a leader. I usually indicate, pull over safely and let them pass by. Full beams head-on are dreadful. I flash them but they take very little notice. At least it's temporary (until the next one!) My hubby and I are of different heights, and our adjustable mirror fell off last week due to being adjusted too much. He glued it back on with superglue, bless him.