This seems reasonable. It would be helpful if we changed the renderers to render the ref in a route=road relation and ignore the ref tag if a route=road relation is present. In Canada we had a problem a while ago with a user making mechanical edits adding prefixes like "ON" and "RR" to a lot of roads. I have been gradually deleting these prefixes but it is very time consuming. Relations are a much better way of storing this data and if renderers use the relation instead, then I could just delete these ref tags instead of fixing them.
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