I drove a decent amount of CA US40HisAub this afternoon. That is signed east to at least I-80 Exit 133, using Geisendorfer Road, Paoli Lane, Ponderosa Way, and Canyon Way. I propose extending it east from where it currently ends along that route to Exit 133. I got on 80 at Exit 133, but a GSV survey shows another segment of Historic 40 running east from Exit 135 via Auburn Street and Main Street to SR 174 on the north side of town. This does not appear to be connected to the segment that ends at 133, but I need to field check.
GSV surveying shows yet another segment stretching following Rollins Lake Road, Magra Road, and Gold Run Road. I'm not finding a signed connection between this and the other segments, but again I need to field check.