There are two common fonts used for the US highway shield. The Federal Highway Administration classifies them as "Series C" and "Series D" (See Richard C. Moeur for more information). I know some of the states 'fonting' policy. In addition, the US highway shield has been enlarged a bitsince going to the back background.
US 6
US
40
US
56
US
59
US
69
US 169
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