Not necessarily, trunk roads are just major regional highways that could be any sort of road, divided or undivided, low or high speed, access-controlled or littered with driveways and adjacent properties. This is an example of a trunk road that happens to be an expressway. Historically, it may have been tagged as trunk for its physical construction as an expressway, but since the definition shifted from expressway to major inter-regional highways, it being a route linking the valley to Pahrump would be the reason for its trunk classification rather than because of it being a high-speed divided highway.