In the US, trunk classification is for major inter-regional highways, ring roads, and any other non-freeway road that may be just as important as Interstate highways. The viaduct is a very short expressway that doesn't serve anything other than cargo trucks bypassing the surface roads to get to the airport. Secondary might even be too high of a classification for this road, as per what this road actually is used for and why it exists.

Not sure why I linked a nonexistent Wikipedia article, must be a force of habit. For some odd reason there doesn't appear to be a GNIS entry for this place, but I do know it's a control city for the nearby exit (which was my reason for adding it). Must be an extinct community or very non-notable unincorporated community, which do sometimes lack Wiki articles and GNIS entries. Searching on the internet, some business sites list this as its own community while others describe it as if it's part of Ruther Glen. Perhaps this might be better fit as a place=locality?

Hello, this section of road should not be a motorway as there is an at-grade crossing between the grade separations. I've reverted this bypass back to trunk.

Hello, this road does not meet the qualifications for motorway classification at it has at-grade intersections.

I'm not sure, I usually interpret "inner" as in the inner area of the multipolygon and outer as areas that aren't part of it. Maybe I'm not doing it right.

Hello, why was Churchill Roosevelt Highway downgraded from motorway to trunk? This particular segment of the highway has recently been upgraded to a controlled-access expressway just like Uriah Butler Highway, with further upgrades along other sections in the future: https://en.wikipedia.org/wiki/Churchill%E2%80%93Roosevelt_Highway#Planned_extensions_and_upgrades

While these upgrades aren't apparent in any of the imagery choices, the upgrades should be sufficiently indicated with the highway ramps along it that were added by me as well as other uses in the past.

Pedestrian street sounds like what you're looking for. :)

Well, a place along a major travel corridor like an Interstate will always receive far more attention than one along a rural state highway, that can't really be dictating factor for a its classification. Place classification is almost always population-based, but if the population is low (under 10k typically) the place is either considered a city for its regional importance (as seen in Nevada, Wyoming, Alaska, etc.) or is downgraded to a town if it's overshadowed by other nearby places.

It is discouraged to tag things simply to have them render a certain way on the map (osm.wiki/Tagging_for_the_renderer This page documents more extreme cases, over-tagging things like populated places, roads, and waterways are far more common). Places should be classified as cities based on their population or their importance in relation to similar/nearby places regardless of what zoom level they render at or their legal classifications. In my opinion Delta might be fine as a city as it's the larger of the bunch, but the other two a still just small towns without a whole lot going on. I think that places like Price and Tooele are better fits for city classification.

Ely was upgraded along with a handful of other rural communities in Nevada due to their locations. Ely is the most important city in the area as it has the highest population among places like Eureka and Austin and is a 3+ hours from any other city of a similar or larger size. Places like Beaver, though, are no less than 45-60 minutes away from much larger cities like Cedar City. I think if these places were larger that would warrant city classification, but consodering their small size and lack of prominence, that might make them good fits for town classification, but this might be something for the locals of the state to decide on.

Perfectly understandable. Not entirely sure if this warrants trunk classification but I've recently been considering bringing up something about US 6 and 50 upon locals to see what they think, since these roads are the main arteries of the region.

Was it intentionally ended at Tybo or was it supposed to go up to Ely?

Hello, please note that the city classification on OSM isn't for the legal status of a place but rather the size of it in comparison to other places. The three cities, while legally classified as cities, are very small and a perfect fit for town classification.

Hello, why was a portion of US 6 to nowhere upgraded to trunk?

(Sorry for the out-of-place response, we wrote ours at the same time)

On another related note, it appears some freeway ramps were changed from motorway links to trunk links despite connecting to motorways:

way/49010840

way/1086982355

way/158976805

way/125436452

I'm assuming these were just some errors that had to do with retagging relations and not intentional, right? Ramps that connect to freeways whether they lead to or from them should always be tagged as motorway links, Might want to have a look at that.

The sections of motorway that were downgraded to trunk in the changesets you made are designated as freeways by the state. There are signs that say "Begin/End freeway" depending on the direct you are heading, at, for instance, Wagner Road (however the definition of a freeway in the real world and motorway on OSM overlap but don't usually mean the same things, so it's no big deal really).

Many states allow cycling on Interstate highways, U.S. routes with freeway segments, and other various freeways. States like Wyoming, South Dakota, and Idaho fully allow it, Missouri and DC discourage it but it's not prohibited, and states like California allow it if there is not a more-suitable alternative available, such as lower speed roads or bike trails (in this case, bikes are allowed on the freeway because it lacks a better alternative such as a frontage road until the highway passes through Boron or Barstow). Something like designated cycle lanes, sidewalks, or roadside parking spaces, would be enough to determine whether a road is a freeway or not, but a law that isn't physically apparent shouldn't.

Hello, why was Pioneer Boulevard upgraded to primary? The segment of road you upgraded only end at another secondary road and closely follows I 15 without serving any major areas like Mesquite/Sandhill do (which is the downtown area).

Why exactly were these seemingly random sections of motorway downgraded to trunk? Streetview shows that the state-recognized freeway portions end by the first at-grade intersections with the freeway terminus signs.

In the US on OSM, there are many roads like airport or seaport access roads classified as primary, but my main reason for upgrading this to primary is so that the Columbia Aiport Expressway that I also changed to primary won't just be primary stub and a route to loop back to itself (the route most traffic taking the expressway will use anyway).