Now that you mention the US 6s on Dodge Street, I think I do recall seeing those at some point. I didn't realize there ever were any others though. The only other different kind of shield I have seen is an older style(with "US" but without the state name) Jct. US 34 shield on 48th St. just before O St. here in Lincoln. I always thought it had to be old, because the only reason I could think of why they would have a "Jct. US 34" sign on 48th St. is because it used to be NE 2, which was moved to a new alignment in the south part of town back in the 1960s or so.
how have I managed to consistently miss that sign? I thought I had scoured both Omaha and Lincoln for old signs!
can you get a photo of that shield please? We'd love to have it on the AARoads shield gallery!
the Nebraska/US state-named shield was the state standard, and therefore ostensibly appeared in many places. I have seen it used most often as a reassurance marker, and in one case as a directional indicator with an arrow:
that might be in error, though, as generally the older federal standards specify a more abstract marker for intersections, and the "full" style (state name, US, number) as reassurance.
I have never seen a US-only shield in Nebraska. It was a federal spec from 1961: a cutout
US-only marker to be used a reassurance marker only when paired with an interstate shield on a freeway, but some states used it in other contexts, like Arkansas using it as a junction marker in at least one example I have seen, and of course California using it universally. Other states (New York and Wisconsin come to mind quickly) had the "US" in various shield incarnations where the feds had omitted it, as late as 1965 for NY and 1982 for WI.