I’m in the process of going over my layout and making sure things are correct for the period I’m modeling. You know, traffic signs and such. Found this site: http://www.trafficsign.us/regsign.html
It has all kinds of info on signs, their design and usage. Something that was very helpful, and what I needed, was when the US changed over the color of Stop signs. According to this source, it was in 1954 when they went from a yellow background to red. No exact date was given, just the year. There’s lots more info on the site for other signs as well.
Lets make this link clickable http://www.trafficsign.us/regsign.html . Thanks for the link Jack, very useful![:)]