Interstates Routes Entirely Multiplexed...

[roadman65]

I-110 in MS is multiplexed with MS 15.

Not anymore, as I understand it.

MS 15 was dropped from the I110 overlap after the new MS 67 trumpet interchange with the realigned MS 15 opened in 2009. There is an end sign for MS 15/67 at I110.

Back in 2010 when I rode it, it was still signed.  Now if IN could still have US 27 signs along I-69 at places where the two routes do not overlap anymore and sometimes PennDOT is slow in updating signs, then MS can easily.

Heck look at NJ 24 which was truncated back to Hanover, NJ when the long awaited freeway completed in 92.  There are still NJ 24 shields to this day along the former route west of Morristown and it has been over twenty years since NJ 24 ended in Hackettstown.

[Alex]

I-110 in MS is multiplexed with MS 15.

Not anymore, as I understand it.

MS 15 was dropped from the I110 overlap after the new MS 67 trumpet interchange with the realigned MS 15 opened in 2009. There is an end sign for MS 15/67 at I110.

Back in 2010 when I rode it, it was still signed. 

When we drove it April 4, 2012, all reassurance shields for I-110 north were accompanied by a MS 67 trailblazer. The lone southbound shield is joined by a US 90 trailblazer. Might check it out again next week...

[jhuntin1]

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

<snip>

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

Actually there is about a 9-mile stretch of I-465 that is not multiplexed with any other highway between exit 16 (I-74) and exit 25 (I-865/US-52). That makes up for the mile and a half on which there are 7 other highways unsigned with it between exit 46 and 47.

edit: d'oh, didn't see this earlier on page 2

[Roadsguy]

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

Also I-99 (US 220)

In fact, if US 15 isn't truncated to Williamsport, the entire thing will still be multiplexed, but also with I-80 and US 15.

[The High Plains Traveler]

I-25 is so close, especially for a major 2di. Colorado Springs disqualifies it, though.

(Unless Google is wrong.)

85 and (unmarked) 87 leave I-25 to go through Fountain and Security, not Colorado Springs. They rejoin I-25 at an overcrossing just south of the CS city limits that has no interchange. U.S. 20-26-87 also parallel I-25 for a short distance east of Casper, WY. 85-87 may also go through Walsenburg, CO (seems to me AASHTO says so), but that route is only marked BL I-25.

[TheStranger]

I-580 in the Bay Area was once multiplexed with I-5w and US-50 prior to 1964. This was before West end US-50 was moved to the I-305 West Cap city freeway location in Sacramento.

Again, no.  580 and 505 were replacement designations for 5W, they never existed at the same time.  (And US 50's west end did not extend to the WX Freeway/Business 80 routing until after 1982; from 1968 to then it was at I-80/Route 99.)

http://www.kurumi.com/roads/3di/i180.html#fn

How about I-180 in California it was entirely a temporary Designation that was entirely on the former north end of CA-17 before it was known as I-580 Richmond-San Rafael Bridge. CA-180 is in Fresno area.

The proposed 180 was never intended to be signed along with Route 17, but rather a replacement designation (as the eventual 580 extension is).

[tidecat]

I-359 in Alabama is multiplexed with AL 69 and US 11 for all of its 2.76 miles, and it has a wrong-way multiplex to boot.

[pianocello]

Business I-40 in Winston-Salem, NC is entirely duplexed with US 421, and Business I-85 in Greensboro is multiplexed with US 29 and US 70.

Yes, I realize that these aren't full-fledged interstate routes, but these are two of the four most likely "green routes" to receive a full interstate designation, in which case they would qualify for this thread.

[hbelkins]

I am old enough to have traveled on Business 40 through W-S and Business 85 through Greensboro when those routes were the mainline interstates, before they were bypassed.

[countyguy]

In Florida, every interstate and US highway is entirely concurrent with an unsigned state highway.

[Bickendan]

I-105 with OR-126.

Every Oregon interstate (and US highway).
I-5 - HWY 1
I-82 - HWY 70
I-84 - HWY 2, HWY 6
I-105 - OR 126, HWY 227
I-205 - HWY 64
I-405 - HWY 61

[formulanone]

Anyone mention I-565 yet? It's either US 72 for a few miles on its east end, and Alternate US 72 for the other western 15 miles.

[mapman1071]

Surprised Nevada's 580 (concurrent with US 395 in its entirety) hasn't been given a mention yet.

I-515 (I-11) concurrent with US 93 & Us 95

[roadfro]

Surprised Nevada's 580 (concurrent with US 395 in its entirety) hasn't been given a mention yet.

I-515 (I-11) concurrent with US 93 & Us 95

The I-11 routing has not yet been decided to take over for I-515. It may go an entirely different direction through/around Las Vegas.

[Strider]

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

At least until I-73 hooks up with US 220 again near Summerfield.. The only portion of I-73 that will be without any concurrences is the one between I-840 future near the airport and US 220 north of Summerfield.

[Strider]

Business I-40 in Winston-Salem, NC is entirely duplexed with US 421, and Business I-85 in Greensboro is multiplexed with US 29 and US 70.

Yes, I realize that these aren't full-fledged interstate routes, but these are two of the four most likely "green routes" to receive a full interstate designation, in which case they would qualify for this thread.

Business I-85 in Greensboro is multiplexed with US 29/70 only till the US 29 exit (Exit 223 of I-40). East of that, Green 85 is multiplexed with I-40. However, that may change as US 70 is proposed to stay with I-40/Business I-85 til the Future I-840/785 (Exit 227) exit then follow the loop back to the original routing of US 70-Burlington Rd. (Exit 19 of Future I-840/I-785).

However, yes they are multiplexed the entire way if you mention the route between Lexington and Greensboro

[rickmastfan67]

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

At least until I-73 hooks up with US 220 again near Summerfield.. The only portion of I-73 that will be without any concurrences is the one between I-840 future near the airport and US 220 north of Summerfield.

What about the segment that will enter SC south of I-74/US-74 in Rockingham?  I haven't heard anything about that being possibly multiplexed.

[Strider]

I don't know, but I don't think the future segment between I-74/Us 74 and the SC border will be multiplexed with any route unless it is changed.

[golden eagle]

Did anyone mention I-516 in Georgia?

[SSOWorld]

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

US-51 stays on I-39 and joins I-55 SB around B-N.  BUSN 51 goes through town on the old route.  Thus all of I-39 is concurrent with another route (US-51 and/or I-90)

[froggie]

US-51 stays on I-39 and joins I-55 SB around B-N.  BUSN 51 goes through town on the old route.  Thus all of I-39 is concurrent with another route (US-51 and/or I-90)

You're correct on I-39/US 51 near Bloomington, IL.  But Mike's also referring to Wisconsin, where I-39 is "alone" for a few miles immediately north of where it splits off I-90/94 near Portage, WI.

[roadman65]

I-190 in Rapid City, SD is totally concurrent with US 16.
I-180 in Cheyenne, WY is concurrent with a whole handful of US Routes and even BL I-25.

[bugo]

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.

The old alignment has been obliterated in places and in other places is just a frontage road.  There are very few segments of old 71 that don't closely follow the 71/49 freeway.

[roadman65]

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.

The old alignment has been obliterated in places and in other places is just a frontage road.  There are very few segments of old 71 that don't closely follow the 71/49 freeway.

The big question is when the Bella Vista Bypass is completed will US 71 still be routed through Bella Vista and Pineville, or will both MO and AR have AASHTO move it onto the new freeway?

[bugo]

US 71 will stay on the highway through Bella Vista.  There is no question of this, unless AHTD changes their policy.  I would like to see US 71 (and US 62 where appropriate) returned to US 71B through Fayetteville/Springdale/Lowell/Rogers/Bentonville.  The northern and southern parts of the original Fayetteville loop can become x49s or US 71S and 71Y.