"...removed all traffic signs. They found that drivers behaved more politely and there were less accidents."

In St. Louis in 1959, they put in 4-way stop signs. The locals did NOT like the idea of taking turns. At a 4-way intersection with a line of cars (occasionally in two lanes) someone would see an opening and GO, and all the cars behind them would follow - ignoring stopped cars from the other direction. Then, when there was finally a break, the other direction would go. If one street had more traffic... too bad! It took several years to semi-train drivers there to use 4-ways as they were intended.

I wonder how that German system would have worked there. Cultural differences are crucial.

(and it seems to me that acrimonious argument (whether serious or a game) IS sort of cultural hobby in England... and Mudcat threads often seem to reflect it. There is an American game of Playing the dozens> where being clever with insults gets you status. I don't care for those games.)