The numbers on U.S. interstate highway signs may seem random, but they can actually be an important navigation tool. This short video shows how it all works. For starters, the interstate system is divided into majors, mediums, and minors. East-west majors get double-digit numbers ending in zero, with higher numbers for the more northern routes...The numbers on U.S. interstate highway signs may seem random, but they can actually be an important navigation tool. This short video shows how it all works. For starters, the interstate system is divided into majors, mediums, and minors. East-west majors get double-digit numbers ending in zero, with higher numbers for the more northern routes...
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