Hans wrote "I had the same question
On Sat, Sep 3, 2016 at 9:57 PM, Nick Hocking <nick.hocking at gmail.com <https://lists.openstreetmap.org/listinfo/tagging>> wrote: >* A car travelling westbound on an undivided road is about to cross a *>* north/south divided road at traffic lights. *> >* We wish to prevent the car from doing a U-turn at this intersection. *>* Do we have to put in two no_u_turn restrictions, one for each of the *>* north/south carriageways. *> >* If we only need one, where do we tag this - on the left carriageway or *>* the right one? "* *I'll ask the question over on the routing list. It does beg the more basic question of...* *Do we make the routing software smart, which has the risk of the software making a wrong assumption/decision and giving the user an incorrect or dangerous directive or do we make the routing software really dumb which entails micro mapping every intersection to a ridiculous degree, which in turn makes it very hard to keep the map complete up-to-date and accurate.* *A third option would be to ban all u-turns world wide :-)* *Nick*
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