[Tagging] Inconsistent road refs

[Paul Norman]

There is a stretch of local highway which used to be signed with a ref, 
but no longer is. On the other hand, most of the intersecting roads 
still show that this highway has the old ref. Some other parts of the 
road remain signed.

The two options for tagging seem to be ref=123 or old_ref=123.
Thoughts?

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