[Tagging] Unsigned portions of signed routes

[Albert Pundt]

How are unsigned segments of signed routes supposed to be mapped
relation-wise? For example, PA 235 in Perry County, PA has a short unsigned
concurrency with PA 17 going down into Liverpool, where both routes end at
US 11/15. However, 235 signage stops where it first intersects PA 17.
Obviously the segment of 17 should be given the "unsigned_ref=PA 235" tag,
but what about the relation? Routing software that relies on relations
would probably assume 235 is signed here, so what's the proper way to deal
with this? Create a separate relation for the unsigned portion? Just don't
add the PA 235 relation to 17 at all?

--Albert
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