Sorry for another ping on your notes, but I wanted to be transparent about what I'm doing. I've decided that some of TIGER and the county's GIS road names around here are "wrong" compared to the signposts (in the Timberwood, Meadowridge, and probably other subdivs). Now, whichever version is "correct" is probably debatable, but I thought it was safe to add both names when there's a discrepancy. I chose to use the signposted name in the "name" tag and put other names in the "alt_name" tag which is a well-known pattern by data users. Incidentally this is what fearsyth did for cedarmill court iirc but they used name_1 tag which is discouraged by josm validation.

I'm using source:name and source:alt_name to indicate which is signposted and which is from county GIS.