Some more interesting road signs from the 1930s-'40s.
Here's one of the Auto Club So. Cal. stop signs from the 1930s with the spherical glass marble reflectors. I set out to steal one of these back when I was a teenager, but I failed - quite spectacularly, actually. That story is
here. (That post also has a good close-up photo of the reflective marbles.)
Here's a Auto Club So. Cal. stop sign from the 1940s, with the more-familiar plastic reflectors:
An Auto Club milage sign. Still quite common in and around L.A. when I was young.
A sign like this was shown in a previous photo of Wilshire Blvd. in this thread. I'm too tired to look it up right now, though...
These porcelain enamel reflectorized RR XING signs were ubiquitous when I was little, too...
Various eBay
-Scott