If you know the U.S. interstate highway system well enough, you can use it to tell basically where you are in the country.
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.
Interstates aren't always sequentially numbered, however. I-50 and I-60 don't exist because those numbers had already been used by highways that were part of the pre-interstate system . If the first digit in a minor-route number is odd, the highway doesn't reconnect with the interstate it started from. That's why these highways are sometimes called spurs, although they can also connect with a different interstate. Because this system only allows for limited number choices , there are many duplicate minors. Both Maryland and Massachusetts have an I-495, for example.
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