Esta lista de escudos, son para crear escudos de carreteras que hacen falta y no tienen ninguno. Para eso necesitarías un programa como Inkscape y seguir la convención de títulos de dichos archivos que están en Wikiproyecto:Estados Unidos/Carreteras/Escudos.
One or two character shields use Roadgeek Font D, two-digit plus letter or three-digit (100s only) use Font C, three-digit (200+) or four-digit use Font B.
Except for the two-digit template, these templates require that you add white shapes behind the number to remove the state outline from the loops of numbers and areas just around the numbers.
↑Erie Co. uses Helvetica for their route shields. You can simply replace the number and upload without converting to path, and the shield will look correct on Commons (even if it doesn't on your computer) because the SVG uses the Nimbus Sans font, a clone of Helvetica, which the Wikimedia servers have installed. Most Linux distros include this font. If you feel uncomfortable with this, you can also use any Helvetica clone (Swiss and Arial are probably close enough) and convert to path to create the shield.