As discussed over at the AARoads forum, I-580 has been extended southwest about three miles, completing the eastern bypass of Carson City. The new segment opened two days ago, just after I returned to Sacramento. I clinched the new segment earlier today.
This extension is already shown in OSM/Mapnik. US 50 and US 395 have been rerouted onto the new segment, and the bypassed part of US 50/395 on Carson St. (but not Fairview Dr.) has been added to US 395 Business and apparently US 50 Business too. I say "apparently" since, while signage on I-580 confirms all the other route changes, I saw no mention of US 50 Business, which has long had iffy signage. I don't know if AASHTO's approval of all the other route changes included a change to US 50 Business.