I would like to come back to the original point of no-U-turn relations where there are no (vertical) road signs. This  is one of the incriminated junctions. For me it is clear from the horizontal signing 8white lines, that this is a no-U-turn situation (or only-straight-on, if you prefer that relation) I am mapping in Italy and I would put on an equivalent junction an "only-straight-on" relation. At least here it is clearly forbidden to cross the solid white lines. I Italy most of these junctions are at present without restriction relations, I suppose mainly because it's considered a minor mapping omission, but not because it would be wrong. And from the traffic point of view it makes sense. If you have taken a wrong exit from a roundabout, it is in many cases simply unsafe to try a U-turn in the exit. I accept the argument that we could create a simpler way of tagging this frequent situation, I agree that the relation approach is cumbersome, but is not at all a tagging error.
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