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America's Highway Numbering System Is Hiding A Giant Math Puzzle

Believe it or not, highway numbers actually make sense. Here's the logic behind odd and even routes, and why the system isn't ...

Yes, There’s Actually a Difference Between a Highway and a Freeway—Here’s Why It Matters

You may call them highways, freeways, expressways or something else entirely. Here's what those high-speed roads are really ...