This is an old question that is no longer in use.
Images may be missing and the information may be dated.
What is true regarding the square sign with the black arrow?
The sign is probably erected by the organisers of some event.
A diversion is, for example, indicated with this official sign:
Direction during diversion (F24)
”The sign indicates the direction of travel during the temporary diversion of traffic. No other colour may be used.”
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