One more thing: Taking everything you said into account, why is Summerlin Parkway (West of the freeway segment) a trunk road? That's definitely something I did not do; plus, it's exactly like Lake Mead Parkway and Paradise Road: expressways tagged as trunk roads because they're the end of freeways. The only difference here is that this part of Summerlin Parkway/CC 215 is under construction, and since the roads are closed to traffic going to and from Summerlin West, it barely sees any traffic at all. Any and all information helps.