One thing I /haven't/ seen addressed yet is whether single relations are preferred, or one relation for each way with a super-relation. Currently both are in use, but I think it would be a lot easier for future code if we pick one and move towards it from now on.
I don't see any advantage for a relation per way; a single relation with roles for each direction has all the information needed by a relation-user, and it's one less thing to keep track of when editing or updating.
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