Rural roads are marked as minor/unclassified, not tertiary. Please fix this error.

That is a good question and seems to be made in error. Thanks for fixing it!

Hmm, that is odd. Haven't messed much with rivers, so I'm afraid I'm no help there.

This is based on the federal classification maps (available for this county on NDOT's website), as well as the fact that per OSM guidelines it does not serve any significant population centers that would not be accessed via US 77 or I-29.

If you've ever driven this route, it is a bit on the dangerous side as well and has not been maintained to the extent one would expect of a primary road.

Haha, I guess I forgot to save in between the two. I have spent most of my life in Nebraska but currently live in Alex, so I frequently edit both. Nice to know these get read, though!

This was reduced to tertiary based on NDOT standards and usage. I'm curious as to your reason for reversion.

Maybe there is a better classification than the one I picked, but it was previously 'unmaintained track road' and that clearly does not fit at they are maintained.

I walked those paths.

Whoops. Fixed. Thanks!

osm.wiki/Highway_Functional_Classification_System

I based all of these classifications off of the guide on the wiki. If this is not correct, then the wiki needs to be updated.

Construction work at this interchange is complete in converting to a diverging diamond interchange. I live in the area and have confirmed.