We don't add names to Interstate roads unless the have a formal name. Whatever map is showing I5 as Unknown Road is a problem with it map renderer, not our tagging. I have removed the name tag. Feel free to respond if you feel I'm wrong. This applies to both of your edits. I'll send you more info on OSM in a message.
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            Published using OSMCha: https://osmcha.org/changesets/172295979
            