Questão jurídica principal
Whether the traffic prohibition at Storchengasse was valid as a zone signal and binding on the defendant.
Decisão extraída
The prohibition was not clearly and lawfully signaled as a zone traffic regulation; it therefore had no effect at the place where the defendant allegedly violated it.
Fundamentação extraída
A prohibitory sign must be immediately clear to the average road user. Here the sign lacked a proper 'ZONE' designation and was not integrated in a lawful zone signalization; the combination with other zone signs did not make the prohibition unambiguously valid.