In the west, U. The interstate highway numbering system is similar to the U. Main interstates get one- or two-digit numbers, while loops and spurs get three-digit numbers that reflect their parent roads. To prevent confusion, one important difference distinguishes interstates from U. While east-west interstates also get even numbers, those numbers get smaller not larger as you travel west. North-south interstates also get odd numbers, but those numbers get smaller as you travel south.
Have we used all the interesting properties of a number? How about whether it's a prime number. Suppose local routes used small prime numbers: Route 2, 3, 5, 7, Yep, remember that 2 is prime. Once the main routes are numbered, smaller roads that connect them can follow this rule:. If you loop back to the same route, just square it. Will this always work? You bet. Any two primes, when multiplied, give a unique number. The fancy math phrase: every number has a unique prime factorization.
See how we're trying to cram a bunch of information into a little number? That's the essence of binary data. An 8-bit binary number can pack in a bunch of related questions into a single byte, and is what makes binary so efficient. Numbers have a bunch of properties, right? Aren't we curious to discover more, like the remainder modular arithmetic?
Maybe Route 12 which is one set of 11, remainder 1 has some connection to Route Learn Right, Not Rote. Mobile Newsletter banner close.
Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Civil Engineering. Is there any rhyme or reason to how U. Yes, there is. But first you need to know a little about the interstate highway system.
Standards were also established for numbering the routes: Routes with odd numbers run north-south. Routes with even numbers run east-west. For north-south routes, the lowest numbers are in the west.
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