US 395 Business signage has been posted for part of old US 395 in the Olancha area, apparently including part of the old road north of Olancha not incorporated in the recent western extension of CA 190. However, it's unclear how much more of the old road is signed or otherwise designated as Business US 395. It might extend to a temporary connector road at Lake Street in Cartago, which is being replaced with a short new road to link the business route to the US 395 mainline.
https://www.aaroads.com/forum/index.php?topic=31804.msg2964419;topicseen#msg2964419UPDATE: Travel Mapping now shows the new business route as complete, with the north end at Lake Street.