The wiki says “Don’t map turn restrictions that are the default for a given jurisdiction and are not signed.” I would guess that any router knows better than to suggest such a maneuver unless it’s really necessary anyway. The only reason I ask is because there are 350 of these relations in my city. I checked several and they appear to have all been created by paid mappers from Amazon, Lyft and other companies. (Are these people paid per changeset? 
) The creators don’t appear to be active any more.
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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/restriction-no-u-turn-from-and-to-roles-are-the-same-way-do-these-serve-any-purpose/105775