It works because we Germans naturally stick to rules and already know how to behave where. Look at countries where hardly anyone follows any kind of rules in daily traffic and then check their accident rates and traffic deaths. Signs are just a physical visible interpretation of the metaphysical traffic rules. And AFAIK we are mostly not removing all signs, we are removing excess signs to make the remaining signs more visible. There is also talk about setting up signs to prevent people from driving up onto a highway in the wrong direction. Apparently not having signs to prevent that makes it happen very often and signs are seen as the primary solution since they work in other countries.
In other words, your point isn't.
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