Buy two speed limit stickers, one indicates 80Kmh another
indicates 90Kmh.
Then next time someone high beams you, overtakes you and stares at
you, show him/her the relevant speed limit sticker.
Put them in your door pocket, easily reachable.
Personally, if I have to overtake someone who is religiously 80 or
90kmh, I'll overtake without fuss. Why stare? I'm just stretching
my luck a little by going 10 above..
