I'd be okay with the suggested demotion to devel. I love the idea of this system and stuff people have been wanting is in here, but a bunch of kinks to work out. Some of this stuff isn't super clear and I think we need to make some decisions.
I also think we need to have a detailed discussion about what counts/does not count as "signed", especially when signs are sporadic or follow multiple alignments, as well as "what counts as a sign?" For several of these auto trails, the main markings are paint or stone/concrete, not standard metal signs, and these nonstandard markings are clearly intended to serve as reassurance/directional assemblies in a way that EMMs or blade shields are not. This is especially relevant for the Lincoln Highway, because there are a crapton of painted shields and concrete markers along the route that people use for wayfinding, but other notable tourist/historic routes in the US are marked primarily with paint. Before the US Route system, paint and concrete markers were the original shields and were used as shields are used today, so I would argue that they should be grandfathered in, as some of the auto trail associations have been trying to maintain some semblance of historical accuracy with their signage.
As far as what's currently on the browser, the LH alignment along old US 40 in Sparks is signed east to McCarran Blvd. I can confirm there was a LH shield on that eastern segment as of last week. I can make that change myself in the coming days.