I'm confused as to why the tagging of this road as a trunk road would be incorrect. It's a wide, high-speed, and somewhat-divided highway. It has a lot in common with other trunk roads in Nevada feature and driving experience-wise and meets all requirements listed on the article for this tag on the OSM Wiki.

I upgraded Boulder Highway and Boulder City Parkway to trunk roads because they are major and widened highways with a speed limit above 40 mph, similar to with how Saint Rose Parkway and Lake Mead Parkway were mapped.

I upgraded NV 169 to a primary because it is the main thoroughfare through Moapa Valley and the general area and acts as the main road through the Lake Mead National Recreation Area and is a link to a couple small settlements within the area.

I upgraded NV 147 because it is a continuation of Lake Mead Boulevard, a major thoroughfare in the Las Vegas Metro, and connects the valley to NV 169. Similarly, I also did the same for NV 564 because it is a continuation of a trunk road (Lake Mead Parkway) and connects NV 169 to Henderson and Boulder City.

Finally, I upgraded Nevada Way since it is the main street through (and the only major road to connect to) Downtown Boulder City.

I do believe it would be considered a motorway since it has a sufficient amount of interchanges, with Rancho Drive and Highland Drive, along with an eastbound entrance from Wynn Boulevard. Not to mention it has multiple basic grade separations over the Cima Subdivison and Sammy Davis Drive and then a tunnel under Las Vegas Boulevard.