Interstates Routes Entirely Multiplexed...

[thenetwork]

Are there any Interstates that are completely duplexed/multiplexed with another route besides the following:

-- I-277 in Akron is completely duplexed and signed with US-224 on its entire route.

-- I-465 and I-469 in Indiana are both multiplexed with at least one other US along their alignments (though not signed as such).

[corco]

Sure

I-180 Wyoming
I-115 Montana
I-315 Montana
I-515 Nevada
I-182 Washington
I-190 So Dakota
I-194 No Dakota
I-180 Nebraska
I-135 Kansas
I-444 Oklahoma
I-240 Oklahoma

[vdeane]

I-790 (NY 5/8/12) and I-587 (NY 28)

Also I-99 (US 220)

[dfilpus]

I-73 ( I-74/US 220/US 421/I 840 Future) until the next extension north of Greensboro, which will be just I 73.

[FightingIrish]

I-894 in Wisconsin is multiplied with I-43 or US45 it's entire route. By the end of this year, it will multiplex with I-41 for it's entire route.

[tman0]

All interstate highways in Georgia are (unsigned) multiplexed with 400-499 numbers, so:
I-16 (GA-404)
I-285 (GA-407)
I-475 (GA-408)
I-185 (GA-411)
I-675 (GA-413)
I-575 (GA-417)
I-985 (GA-419)
and I-516 (GA-421)

[oscar]

I think I-195 Florida is also FL 112, though not signed as such.  Also, I-585 South Carolina, with US 176, and the new I-495 North Carolina (both full and future segments), with US 64, as well as I-140 North Carolina, with US 17.

And I-265 in Kentucky, with KY 841, and unsigned I-296 in Michigan, with US 131.  There are probably a bunch of others.

The unsigned paper Interstates of Alaska and Puerto Rico are each completely multiplexed with one or more signed state/equivalent routes.

[rickmastfan67]

I-376 in Pennsylvania used to be entirely multiplexed with US-22 until I-376 was extended in 2009.

[74/171FAN]

I-581 with US 220 (Roanoke, VA)

[SSOWorld]

I think I-195 Florida is also FL 112, though not signed as such.  Also, I-585 South Carolina, with US 176, and the new I-495 North Carolina (both full and future segments), with US 64, as well as I-140 North Carolina, with US 17.

And I-265 in Kentucky, with KY 841, and unsigned I-296 in Michigan, with US 131.  There are probably a bunch of others.

The unsigned paper Interstates of Alaska and Puerto Rico are each completely multiplexed with one or more signed state/equivalent routes.

Name an Interstate in Florida that isn't "multiplexed" with another route (They have hidden state routes following each one - same for Georgia)

[Eth]

Even if we limit it to routes that are actually signed, Georgia still has a couple:

- I-516 is concurrent with SR 21 for its entire length
- I-575 is concurrent with SR 5 for its entire length

In the "close but no cigar" category, US 23 hops onto I-985 for all but the southernmost four miles.

[getemngo]

Another "almost" one... I-39 has US 51, I-90, or I-94 for all but the 8 miles north of where it leaves I-90/94.

I-194 No Dakota

I-194 in Michigan is entirely multiplexed with M-66. So we have at least two of them on the list!

I-894 in Wisconsin is multiplied with I-43 or US45 it's entire route. By the end of this year, it will multiplex with I-41 for it's entire route.

I'm not sure what I-41's exact route is supposed to be, but won't it all be multiplexed with either I-894, US 45, or US 41?

[Revive 755]

* I-172 with IL 110

* I-88 with IL 110, depending upon where the actual western terminus of I-88 is (since the end/begin signs are west of I-80, see Streetview)

[SSOWorld]

Another "almost" one... I-39 has US 51 for all but its southernmost 8 miles.

I-194 No Dakota

I-194 in Michigan is entirely multiplexed with M-66. So we have at least two of them on the list!

I-894 in Wisconsin is multiplied with I-43 or US45 it's entire route. By the end of this year, it will multiplex with I-41 for it's entire route.

I'm not sure what I-41's exact route is supposed to be, but won't it all be multiplexed with either I-894, US 45, or US 41?

I-41/US-41 all the way from Green Bay to the Tri-State north end in IL.  Add US 45 from the Germantown Merge to the Hale Interchange, I-894 for the whole route, I-94 from the Mitchell to the Tri-State.  So in essense it's a cover route

[SSOWorld]

* I-172 with IL 110

* I-88 with IL 110, depending upon where the actual western terminus of I-88 is (since the end/begin signs are west of I-80, see Streetview)

IL 110 follows another route for its entirely - what route depends on where.

[roadman65]

I-110 in MS is multiplexed with MS 15.

[Dr Frankenstein]

I-595 with U.S. 50. So much that they don't even bother signing it.

[Rover_0]

Another "almost" one... I-39 has US 51, I-90, or I-94 for all but the 8 miles north of where it leaves I-90/94.

I-194 No Dakota

I-194 in Michigan is entirely multiplexed with M-66. So we have at least two of them on the list!

I-894 in Wisconsin is multiplied with I-43 or US45 it's entire route. By the end of this year, it will multiplex with I-41 for it's entire route.

I'm not sure what I-41's exact route is supposed to be, but won't it all be multiplexed with either I-894, US 45, or US 41?

<Tangent>

Personally, I wouldn't mind a non-concurrency between US-41 and I-41...as in, US-41 "turns into" I-41. I really wished this was how the entire 2di aspect of the Interstate system was applied (3dis would be as they are today so long as numbers are available by state).

</Tangent>

Back to the topic at hand, I-270 in Colorado has this distinction, running concurrent with US-36. That said, unless something has changed...US-36 isn't signed along this stretch.

[mgk920]

I-535 (MN/WI) is entirely combined with US 53.

Also, besides US 51 hopping off of I-39 a few interchanges north of its south end at I-55 in Normal, IL, I-39 is all by its lonesome between I-90/94 (Cascade Interchange) and where US 51 hops on on the north side of Portage, WI.  That part of the freeway was WI 78 before it was 'promoted' into a full interstate back in the 1980s.

Mike

[Molandfreak]

* I-172 with IL 110

* I-88 with IL 110, depending upon where the actual western terminus of I-88 is (since the end/begin signs are west of I-80, see Streetview)

IL 110 follows another route for its entirely - what route depends on where.

That's not the question. The question is weather I-88 actually ends at I-80, or at the first at-grade west of I-80.

[bulldog1979]

unsigned I-296 in Michigan, with US 131

Actually, no. I-296 turns northwesterly at its northern end while US 131 turns northeasterly to follow the Grand River. If you zoom in on MDOT's Physical Reference Finder Map far enough, you'll see that those ramps are the I-296 mainline.

[jp the roadgeek]

I-393 in NH with US 4/202, most of I-291 in MA with US 20.

[-NCX75-]

I-2 in south TX shares its alignment with US-83...

[pianocello]

Isn't all of I-49 in Missouri cosigned with US-71? If so, I hope 71 is moved back onto its old route at some point.

[mcdonaat]

Isn't all of I-49 in Missouri cosigned with US-71? If so, I hope 71 is moved back onto its old route at some point.

I was told a while back that US Routes cannot be moved back onto their former alignment if it is a downgrade to highway. I already asked about moving US 90 once I-49 was signed, with no luck.

I-910 in New Orleans - multiplexed with US 90 Business