At present we have many different approaches out in the field, which make life difficult to any routing software. I notice that we have another option, which I have not seen implemented in the database, i.e. to place the exit tag on the highway at the position of the last corresponding road sign before the actual split. This would require on-the ground knowledge or Mapillary/OpenStreetCam photos. It would also mean that the exit tag is not necessarily on the actual road split on the map. And it would require a lot of retrofitting work based on-the-ground checks. It would be in line with the wiki for "highway=motorway_junction", which states "This node should be positioned as the last point before the splay at which it is still possible to make a smooth turn."
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