On the M3 today, two lane were become 1, I was doing about 99km/h, car in front was going a bit slow, maybe 90km/h, instead of speeding up when I hit the brakes, because they're lane was about to end.
They put the right indicator on, and slow down even more and partially merge, fortunately there was room to switch lanes. I think he was nearly at a complete stop in a 100zone while merging.
They had right of way when merging because they were in front, but obviously they don't understand merge laws at all