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The mandatory signs referred to mean:
Direction to be followed (D1)
”The signs indicate that the vehicle may only be driven in the direction of the arrow or, in the case of two arrows, in either arrow’s direction. The symbol is adapted to the conditions of the location.”
The rectangular signs with several arrows are arrow markers (X1) and not mandatory signs, which were the subject of the question.
Roundabouts are never designed so that you must turn off at a certain exit road, you can always drive around if you want.
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