I'm thinking of busy British A roads going from 2 to 1 lane, usually the last merge point is at a standstill. I've witnessed insanely aggressive behaviour by dr

I'm thinking of busy British A roads going from 2 to 1 lane, usually the last merge point is at a standstill. I've witnessed insanely aggressive behaviour by drivers trying to block others' merges. My driving instructor always told me to behave selfishly, because "courteous" driving (flashing lights, slowing down, waiting for someone to emerge etc) is unpredictable by comparison! Courteous driving becomes its own form of aggression when another driver misunderstands.