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1957: After a Unique Drive-By Audition, AASHO Approves the Final Version of the Interstate Shield

August 14, 1957 The Administration Committee of AASHO (now known as AASHTO) approved the now-familiar shield used on the Interstate Highway System. The committee made this decision in the wake of several months during which the association’s U.S. Route Numbering Committee sifted through and evaluated dozens of shapes and sizes for a possible route marker... Continue Reading →
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Transportation History broke the news in on Thursday, August 14, 2025.
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