I had an argument with a taxi driver. I thought that I'm 100% right, and he is an ass. I shouted at him, and even make myself to be ready to get into a fight. (I have never ever been in one in my life; yes its a bad thing.. whatever) He looked at me and said sorry, like this:
His hand just made me shut up. After a while I start to think: "could I be wrong?" Then I reached my destination. Parked. Then think... I was the one who is wrong. Clearly. And he said sorry to me, and smiled to me. I felt really bad, and wished to take back my actions to him.
I think, showing that "I'm sorry hand" even if you were 100% right, solves many problems in the traffic.