Occasionally when you’re driving, you’ll make a mistake and perhaps need to adjust and it can create some awkward situations. Like today, my dad ended up in the wrong lane to go straight instead of turn at a light. He had to cut in line to make sure we could go the right way. It’d be nice if we could communicate “sorry, I screwed up. Excuse me. I just need to slip in there.”
Right now all we have for inter car communication is the horn, which has kind of an aggressive implication to it. This is for trying to de-escalate potential road rage.
In situations where you’re basically saying, “thank you for being a better driver than me,” opening your window and putting out your hand with all fingers fully spread is the correct gesture. For me at least, it dissipates my anger when someone has cut me off, because at least they’re acknowledging and apologizing. I usually assume the reason is because shitty GPS gave them impossible directions.