For my European layout, I made a special font out of the signs.
Depending on the colors, they are made up of individual characters in a specific order like the example below
Now I can print them out in what ever size I need them by changing the font size.
It would take some time but if there is interest, I could work on the US signs. I might need to narrow down which signs since it seems the US has about two to three times more signs than the internationals.