I noticed in Nevada DOT's State Maintained Highways Description Index that SR 121 in Churchill County has been reclassified as a frontage road (FRCH08). Streetview as of August 2022 still shows signage for SR 121 at the southern terminus.
Does anyone have any insight as to why this was done? This is certainly not a frontage road.
I didn't even catch that change.
This is Dixie Valley Road, which leads to Dixie Valley. The maps in NDOT's SMH book show it as a "site", which typically denotes a former town site with little to no permanent population. If that's the case, and there's no other important uses served by the road (such as industrial sites, mines, military installations, state park, state prison, etc.), then I can see downgrading the route from a primary state highway. This keeps the route under state maintenance, but probably not at the funding and maintenance level of a state highway.
NDOT does not have a bunch of different route type classifications. Even the current state route numbering system adopted in 1976 was based on Federal Aid Highway system classifications and funding levels (100-400's as primary state highways, 500-600's as urban highways, 700-800's as state aid [kind of a defacto "secondary" tier]), but I don't think they've used that for funding purposes since roughly 1991. NDOT has a few other road classifications: FR (frontage road), SP (state park), CD (collector-distributor), AR (access road), RP (roads and parking lots serving rest parks), ER (escape ramps).
NDOT puts a lot of things that wouldn't typically be considered a "frontage road" into the FR category. For instance, many urban roads that interchange with a freeway are maintained as a FR within the NDOT ROW of the interchange area (especially if the intersecting road had once been a state-maintained highway)...examples include Keystone Ave at I-80 in Reno (FRWA55), Neil Road at I-580/US 395 in Reno (FRWA44, formerly SR 671), Spring Mountain Road at I-15 in Las Vegas (FRCL51, formerly SR 591), Sunset Road at I-515 in Las Vegas (FRCL63, formerly part of SR 562), etc. There are also some other frontage roads in Carson City that are not connected to the rest of the state highway system, but are part of roads adjacent to NDOT headquarters.
I'm not sure what NDOT's criteria are for some of the classifications, but it seems like many assets, including this downgrade of SR 121, might fit better in the AR category than FR...