this post was submitted on 12 Mar 2026
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It's really not that complicated. The only other direction to go on I-65 is north.
Interstates with odd numbers run north and south. Even numbers run east and west.
The way I always remember is both North and South have an odd amount of letters (5), and East/West have an even amount of letters (4).
Sure, but use Google maps and have a look at "i-435"
Three digits starting with even are loops, with interstates at both ends, starting with odd are spurs, with interstates at one end. Thats why I-495 can be both the capital beltway and loop around boston
If you want a challenge, southwest of Boston there’s a short stretch of overlapping interstates where you can be headed north on I-95 while heading south on I-93
Similar overlaps over in NY with 87/287, and 95 does something shifty near there also.
BTW there are multiple I-495s and 2/5 are Spurs
And I thought I-45 being an "interstate" that only exists in Texas was bad!
There are interstates in Oahu if that helps, ha ha
I think it is usually multiples of 10 as well so for example I-5 runs from the border in San Diego (or close enough) to the border with Canada. I-10 runs from LA in California to Jacksonville Florida, smaller routs ending in 2, 4, 6, or 8 are small sections that terminate a few towns over usually or connectthe bigger highways to eachother.
Ah, interesting. The number of digits means something too. 3-digit numbers are... Some other kind of routes. I'm too tired to remember exactly 🤦🏻♂️
Edit: auxiliary routes
Basically, routes meant to serve a metro area/region instead of being actually cross-country -- "Interstates" that don't actually go inter-state. Think ring roads around cities and whatnot.
Nah.
Around here I-76, I-78, I-80, I-84 (what happened to 82? I don't know); are all major roads that go through multiple states
Going the other way 81, 87, 95 are all significant
In what world is that not complicated
I'm a flight instructor, have been for over a decade. Ask me how VORs work. In my world, highway numbering is not complicated.
How could it be less complicated?