I didn't reroute any of the county roads, at least I don't think I did. I found it like this when I started editing the area.

Okay, I'll revert this, too.

I noticed a bit too late...
I'll manually check every road route relation in the county and remove the duplicates.

In that case, why does the primary designation end at Eastgate Road in particular?

Oh, okay then.

@limes11 It was a wrong sign error, as I completely forgot that new IDs should be saved with negative numbers.

I apologize severely. I used Overpass Turbo and JOSM to edit them. I used a Python script to find all highways in a bounding box (in this case, Weld County) to create new road route relations. As I only had data from that box, I had no idea that I was adding these routes to different relations, so I deeply apologize; I did not mean to break half the world. I will fix the script to make the relation IDs negative so they don't mess up any existing relations. Once again, I'm very sorry, and I hope you understand. Thank you.

Okay. I've only been to Reno once, so I'm not as familiar with its road network as I am with Las Vegas's xD.
Speaking of Lake Mead Parkway and Boulevard, I did connect their primary classifications because, as you mentioned earlier, it's one of the only roads that can access Lake Mead, and having Lake Mead Parkway's primary classification just end at a random intersection felt off to me. Is there a reason the primary designation ended at Lake Las Vegas Parkway specifically?

Okay, I'll go change it back.

Okay, I will fix these.

Okay, I will keep this in mind next time. Thank you!

Okay, I will fix them once I regain access to JOSM. If an entity's boundaries (say, a suburb) is defined with bi-directional roads (such as The Lakes), would it then be appropriate to tag the road as an outer part of the relation? Because the alternative—draw a new way such that it perfectly overlaps with the road—is, in my opinion, more of a pain when I, for example, hide landuse features and boundaries because I only want to edit traffic roads. iD will prevent you from editing the road because it's connected to a hidden feature.

Alright, I'll go ahead and change it back to a primary road. Thanks for the information!

Okay, thanks for informing me again!

Alrighty, that's very informativea, and I appreciate it. But, if I recall correctly (edits to Washington Avenue, Bonanza Road, and Casino Center Boulevard), you told me that state highways don't actually tell people about the road's importance in the network. I could make a list of Nevada State Highways, but the list will (likely) only get smaller as the Nevada DOT relinquishes control of state highways. Where could I make such a page, and how (if possible, like you're implying now) could this list help with road classifications?

Okay. Who even comes up with these rules anyway?

Got it, thanks!

(Late response, but...)
Alrighty then. I don't know if these are signed since street-level imagery is limited here, so I might have to wait a while. From the pictures I was able to obtain from the street leading into the area, the private drives don't appear to be signed, so I could at least change those. This area in particular is a gated community, which could explain the lack of street-level imagery inside the area.

Alright, I see what you're saying now. I've now restored the secondary classification to Hualapai Way. Once again, thanks for sharing this information with me!

Oh, okay then. Thanks for informing me again!