What obligation does a circular blue sign with a white arrow indicate to drivers?

Question

DentroTest · Accepted Answer

This sign belongs to the group of mandatory signs (Series R-400). The circular shape and blue background indicate that performing the shown action is imperative. In this case, the arrow points to the only direction that vehicles must follow. It is crucial to distinguish it from square signs (informative), which might indicate a one-way street, or from priority signs. This sign explicitly prohibits taking any direction other than the one marked by the arrow.

What obligation does a circular blue sign with a white arrow indicate to drivers?

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