It's obvious to me that the "banner" is not part of the network. US 1
Alternate is part of the U.S. Highway system (US:US), not some mythical
"U.S. Highway Alternate" system.
It also makes the most sense to put it in the ref tag. Otherwise there's
inconsistency between an alternate signed as US 1 Alternate and one
signed as US 1A (with the suffix in the shield). In each case I'll also
use the modifier tag (modifier=Alternate/A).
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