Category:Colored U.S. Highway shields
English: Differing systems of color-coding were used on U.S. Route signs in a few states in the 20th century. The practice is now prohibited by highway standards.
This category has the following 2 subcategories, out of 2 total.
Media in category "Colored U.S. Highway shields"
The following 3 files are in this category, out of 3 total.