🚛 🚗 The Interstate's Forgotten Code 🚗 🚛 | Summary and Q&A

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February 10, 2022
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CGP Grey
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🚛 🚗 The Interstate's Forgotten Code 🚗 🚛

TL;DR

Learn how to navigate the interstate highway system based on the numbering system, including major and minor routes.

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Key Insights

  • #️⃣ Interstate Majors are represented by double-digit numbers, with even numbers indicating east-west routes and odd numbers indicating north-south routes.
  • 👪 Interstate Minors have three-digit numbers and can either connect back to their parent Major or continue as a spur without connecting back.
  • ❓ Some exceptions and inconsistencies exist within the interstate numbering system.
  • ❓ Interstates can be categorized as interstate interstates, intrastate interstates, bypasses, beltways, or spurs.
  • #️⃣ The interstate system includes duplicate numbers for some Minors and Mediums to accommodate multiple routes in densely populated areas.
  • 🦕 Long Island's Interstate 495 is technically an exception and should start with an odd digit, not an even one.
  • 🎅 San Francisco's Interstate 238 does not follow the traditional bypass numbering pattern.
  • #️⃣ There are one-off numbers and exceptions within the interstate system, such as Interstate 35 splitting into multiple branches.
  • ❓ The numbering system of Interstate 69 is unique, featuring split routes and a separate designation.
  • 🤘 Some smaller interstates, such as Interstate 878, may not have signs and can be challenging to locate.

Transcript

The interstate highway shields hide within them long forgotten knowledge.  As our great ancestors could navigate by the signs in the sky before the creation of the compass, so too before GPS could they navigate by these signs. Come with me and learn how to navigate the constellations created across a continent by the First, are the Interstate Major... Read More

Questions & Answers

Q: How are Interstate Majors and Minors distinguished?

Interstate Majors are represented by double-digit numbers, while Interstate Minors have three-digit numbers.

Q: How are Interstate Majors numbered?

Interstate Majors have even double-digit numbers for east-west routes and odd double-digit numbers for north-south routes.

Q: What do the numbers used for Interstate Minors indicate?

If the first digit of an Interstate Minor is even, it means the Minor will eventually connect back to its parent Major. If the first digit is odd, it indicates a spur that will not connect back to its parent.

Q: Can Interstate Minors have duplicate numbers?

Yes, there can be duplicate numbers for Interstate Minors as long as they are far apart enough to avoid confusion.

Summary & Key Takeaways

  • The interstate highway system has a unique numbering system that can help navigate the country.

  • Interstate Majors are represented by double-digit numbers, with even numbers indicating east-west routes and odd numbers indicating north-south routes.

  • Interstate Minors have three-digit numbers and either connect back to a parent Major or continue as a spur without connecting back.

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