[Tagging] ref tags and "reference routes"

[Mike N.]

> so should a reference route designation that isn't on a sign go in a ref
> tag or not? the wiki doesn't
> discuss this. if ref shouldn't have this, perhaps a variant on ref is
> needed?

  I would say no - because the ref tag can generate route shields.   I would 
be very confused if the county road numbers began popping up as route 
shields.  It would fit better under a separate tag, but I don't have any 
suggestion on a tag variant.