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[Brandon]

I-275: OH/IN/KY, MI
I-475: OH, MI
I-675: OH, MI
I-155: MO/TN, IL
I-470: KS, MO (and CO-470 with E-470 in Colorado for a bonus)
I-180: WY, NE
I-235: KS, OK

[NE2]

Not an interstate, but both PA and Ohio have a US-322.

Fuck the what?

[Zeffy]

Not an interstate, but both PA and Ohio have a US-322.

...so does New Jersey. 3-digit US Highways are one single road, unlike the 3dis of the Interstate System, which can be different roads (I-495 NY and I-495 MA for example).

[bzakharin]

Not an interstate, but both PA and Ohio have a US-322.

...so does New Jersey. 3-digit US Highways are one single road, unlike the 3dis of the Interstate System, which can be different roads (I-495 NY and I-495 MA for example).

I didn't realize that US-322/22 was a multiplex. I thought the two 322s were independent of each other. I guess I was wrong

[TheHighwayMan394]

US 422 is the one with the "gap" through central Pennsylvania.

[Eth]

I-275: OH/IN/KY, MI

Also in Knoxville, TN.

There's I-185 (GA, SC). And since future Interstates were mentioned earlier, we can add I-285 (GA, NC).

[NE2]

US 422 is the one with the "gap" through central Pennsylvania.

And it crosses the Ohio-Pennsylvania line with no gap.

[hbelkins]

are  I-57 and I-49 the only roads without any 3d's?

I-68 doesn't have any.

[Charles2]

I-265 (IN, KY - they're still separate 3-dis until the new Ohio River bridge is built)
I-275 (OH, IN, KY)

OK, I see how 265 is two separate routes, but what are your adjacent candidates for 275?


iPhone

I-275 in Tennessee.

[thenetwork]

I-265 (IN, KY - they're still separate 3-dis until the new Ohio River bridge is built)
I-275 (OH, IN, KY)

OK, I see how 265 is two separate routes, but what are your adjacent candidates for 275?
iPhone

I-275:

Knoxville TN
Cincinnati OH (+ KY and IN)
Detroit MI

[empirestate]

Okay, here's the complete list by my best count:

105 - CA, OR (2)
205 - CA, OR/WA (2)
405 - CA, OR, WA (3)

110 - TX, LA, MS (3)
610 - TX, LA (2)

215 - CA, NV, UT (3)

220 - LA, MS (2)

235 - OK, KS (2)

140 - TN, NC (2)
240 - TN, NC (2)
440 - AR, TN, NC (3)

155 - TN/MO, IL (2)

264 - KY, VA (2)

265 - KY, IN (2)

470 - KS, MO (2)

275 - TN, KY/IN/OH, MI (3)
475 - OH, MI (2)
675 - OH, MI (2)

180 - WY, NE (2)
580 - CA, NV (2)

185 - GA, SC (2)
285 - GA, NC (2)

190 - NY, MA (2)
290 - NY, MA (2)

291 - CT, MA (2)

195 - VA, MD (2)
295 - NC, VA, DC/MD, DE/NJ, NY, RI/MA (6)
395 - VA/DC, MD (2)
495 - NC, VA/DC/MD, DE (3) and NY, MA (2)
695 - DC, MD (2)

A few things that stand out to me:

–We've already seen how I-5 is special, with its full sets of capitals, largest cities, and adjacent 405s.
–I-95, to nobody's surprise, is the big bonanza here. Five of its 3dis are eligible for the list, more than any other parent route, and the winner by a long shot is I-295 with six adjacent instances.
–I-495 is special in having two sets of adjacencies, separated by NJ, totaling five. It and I-295, in fact, are the only ones nationwide that score anything more than 3.
–I-265 would have scored a 3 with the former I-265 in TN.

[CNGL-Leudimin]

–We've already seen how I-5 is special, with its full sets of capitals, largest cities, and adjacent 405s.

I-205 also exists in all three states I-5 passes through... but there are only two of them.

–I-95, to nobody's surprise, is the big bonanza here. Five of its 3dis are eligible for the list, more than any other parent route, and the winner by a long shot is I-295 with six adjacent instances.

I like how CT and its lack of an I-295 can be skipped by the fact NY and MA share a land border. Same with PA (Though in this case I-295 goes straight from DE to NJ). Too bad NH has a coastline, if not then all of ME 3dis would count (with a whooping 7 for I-295).

–I-495 is special in having two sets of adjacencies, separated by NJ, totaling five. It and I-295, in fact, are the only ones nationwide that score anything more than 3.

And both sets would have been joined if the Mid-Manhattan expressway was built and I-495 extended to NJ! Also, if the same I-495 was connected to RI (thus skipping CT), then CT could have its own I-495 and it would create an interesting situation where there would be an I-495 in between the termini of another I-495! But this is fictional terrain.

–I-265 would have scored a 3 with the former I-265 in TN.

It was 3 until 2000. And it will dissappear soon when the I-265s around Louisville are joined.

[MikeTheActuary]

I-2, I-4, I-12, I-39, I-86 (both), I-88 (both), I-97 (though it did have two proposed at one point).  Probably others...this is just what I could think of offhand.

Throw 66, 68, 73, 83, and 99 into the mix too.

Also 8, 27, 37, 41, 43, H-2, H-3, and the unsigned Alaskan and PR interstates.

[Henry]

I-2, I-4, I-12, I-39, I-86 (both), I-88 (both), I-97 (though it did have two proposed at one point).  Probably others...this is just what I could think of offhand.

Throw 66, 68, 73, 83, and 99 into the mix too.

Also 8, 27, 37, 41, 43, H-2, H-3, and the unsigned Alaskan and PR interstates.

As well as I-17, I-19, I-49 and I-57. (I-24 and I-45 don't count because they both have 3di's, though unsigned at that.)

[1995hoo]

....

–I-495 is special in having two sets of adjacencies, separated by NJ, totaling five. It and I-295, in fact, are the only ones nationwide that score anything more than 3.
–I-265 would have scored a 3 with the former I-265 in TN.

As noted above, I-440 would have scored a 4 with the former I-440 in OK.

[Bickendan]

I-2, I-4, I-12, I-39, I-86 (both), I-88 (both), I-97 (though it did have two proposed at one point).  Probably others...this is just what I could think of offhand.

Throw 66, 68, 73, 83, and 99 into the mix too.

Also 8, 27, 37, 41, 43, H-2, H-3, and the unsigned Alaskan and PR interstates.

As well as I-17, I-19, I-49 and I-57. (I-24 and I-45 don't count because they both have 3di's, though unsigned at that.)

And Future I-9 and I-11.

[Bickendan]

–We've already seen how I-5 is special, with its full sets of capitals, largest cities, and adjacent 405s.

I-205 also exists in all three states I-5 passes through... but there are only two of them.

Furthermore, had I-305 and I-505 in Oregon been built, they would have been paired with California's for this list.

[golden eagle]

I-2, I-4, I-12, I-39, I-86 (both), I-88 (both), I-97 (though it did have two proposed at one point).  Probably others...this is just what I could think of offhand.

Throw 66, 68, 73, 83, and 99 into the mix too.

Also 8, 27, 37, 41, 43, H-2, H-3, and the unsigned Alaskan and PR interstates.

The future I-22 will be childless, too.

[froggie]

The future I-22 will be childless, too.

Initially, yes, but not long term.  The Birmingham Northern Beltline is slated to become I-422, with I-222 proposed as the connector between that Beltline and I-22.

[tidecat]

I-265 (IN, KY - they're still separate 3-dis until the new Ohio River bridge is built)
I-275 (OH, IN, KY)

OK, I see how 265 is two separate routes, but what are your adjacent candidates for 275?
iPhone

I-275:

Knoxville TN
Cincinnati OH (+ KY and IN)
Detroit MI

If Georgia had an I-275, it would connect the Knoxville and Tampa Bay instances.


iPhone