Interstates which exit off of themselves

Started by mwb1848, September 09, 2015, 05:53:40 PM

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The Nature Boy

The north end of the I-95/MA 128 multiplex requires you to exit MA 128 to remain on I-95.


Tom958

Wow, third page and nobody has mentioned I-40 on the west side of Greensboro, which ended up exiting itself despite the considerable effort and expense put into building an unTOTSO interchange.

Big John


TEG24601

I-75 at M-3/I-375.  There are even exits to make the additional movements on the ramps.  This used to be marked as I-75 exiting, but when they rehabilitated the roadway, they made the mainlines the exits.


Technically I-15 in Butte, MT.  In reality I-15 joins I-90, but due to the "lowest number takes priority" rule, all exits over this stretch are based on I-15's mileage, not I-90s, making it I-15 not I-90 through this stretch.


I didn't see it mentioned before, but I-80 must exit I-80/94 to join the Indian Toll Road I-80/90 and it is really crappy connection between the two Interstates.


I-80 and I-74 near the Quad Cities.  This interchange it a cloverleaf, but functions like a tangent interchange.  As 74 comes in from the West and exits to the South, and 80 enters from the North and exits to the East.  It needs to be rebuilt like the 403/407 Interchange near Toronto.  Additonally I-74 has to exit itself after only 5 miles of existence to head toward I-80 in the first place, as the mainline is I-280 which it joins to head East (another cloverleaf).


I-80 near Sidney, NE, the mainline continues as I-76 to Denver.


I-15 North of SLC has to exit the mainline, otherwise you join I-84 to Boise and Portland.  I-84 as the same issue at I-86 in Idaho.
They said take a left at the fork in the road.  I didn't think they literally meant a fork, until plain as day, there was a fork sticking out of the road at a junction.

cwf1701

You could also add I-96 at the I-96/I-275/I-696/M-5 interchange. The Mainline is the pre-1977 alignment of I-96 (going to Grand River Ave. and Detroit). Going east, you have to exit onto I-275 southbound to stay on I-96 otherwise you be on I-696/M-5 Eastbound

GaryV

Quote from: cwf1701 on September 12, 2015, 08:31:09 PM
You could also add I-96 at the I-96/I-275/I-696/M-5 interchange. The Mainline is the pre-1977 alignment of I-96 (going to Grand River Ave. and Detroit). Going east, you have to exit onto I-275 southbound to stay on I-96 otherwise you be on I-696/M-5 Eastbound
That one's pretty much an even split.

But the intersection down at M-14 is more like an exit, to continue east on the Jeffries portion of I-96.

jdb1234

I-85 will do this at I-685 in Montgomery

1995hoo

Another honorable mention occurred to me for another defunct instance of an Interstate exiting off itself: I-84 east of Hartford during the I-86 era.
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Pete from Boston


Quote from: 1995hoo on September 14, 2015, 07:36:02 AM
Another honorable mention occurred to me for another defunct instance of an Interstate exiting off itself: I-84 east of Hartford during the I-86 era.

The judges may not allow it.  By the time the exit was built, the mainline had been redesignated 84 for its whole length, and the exiting road renamed 384.

bassoon1986


thenetwork

This one is debatable:  I-71 South at I-480 West/SR-237 South in Cleveland.   

The mainline (left 2 lanes) on I-71 South proceeds straight as the Berea Freeway/SR-237 with a split with I-480 West before the airport.  I-71 South continues in the right 2 lanes as a "flyover" over the SR-237/Berea Freeway transition.  Though the official "exits" are for I-480 and SR 237 (as LEFT exits), I still consider that I-71 south is leaving one mainline for another.

Pete from Boston

Either the Connecticut Turnpike exits I-95 (not applicable because the number does not), or I-95 exits off the mainline Turnpike that preceded it, even though it is clearly the mainline now.

Either way it's not really a good answer.  Sorry.

TheCatalyst31

Westbound I-94 does this in practice at I-39/I-90 in Madison. WIS 30 is signed as an exit, but it follows the mainline while I-94 follows a ramp onto the other two interstates.

OracleUsr

I-240 West at US 19/23 South in Asheville DEFINITELY qualifies.  It's a tight ramp, too.  If I-26 stays where it is in downtown, it will qualify too Westbound (to stay on I-26 you have to take a sharp left exit off of what is I-240 Eastbound)

Not an interstate, but honorable mention.  US 64 (both directions but especially westbound) at US 13/17 in Williamston.  To stay on US 64 West you have to exit off of what becomes US 13/17 (old US 64)
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JCinSummerfield

Quote from: TEG24601 on September 12, 2015, 11:57:50 AM

I didn't see it mentioned before, but I-80 must exit I-80/94 to join the Indian Toll Road I-80/90 and it is really crappy connection between the two Interstates.


If only the Native Americans had thought of a toll road 250 years ago!  They'd still own the whole land!

Thunderbyrd316

I just went through this whole list and am surprised that nobody has mentioned I-80 eastbound at I-235 and I-35 southbound at I-235 in the Des Moines metro area.

iowahighways

Quote from: Thunderbyrd316 on September 15, 2015, 06:33:17 PM
I just went through this whole list and am surprised that nobody has mentioned I-80 eastbound at I-235 and I-35 southbound at I-235 in the Des Moines metro area.

Let's not forget I-380 in both directions at the US 20/218 interchange in Waterloo and I-380 southbound at US 20 near Raymond.
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Occidental Tourist

Quote from: rschen7754 on September 09, 2015, 11:01:06 PM
I-5 CA: at the East LA interchange (both ways), at CA 99 (northbound), at I-580 (northbound).

Also at I-805 in San Diego.

Arguably I-10 e/b at I-110/CA 110 in Los Angeles.  I-10 at I-5 in East Los Angeles (both directions).

I-15 s/b at I-215 in Devore.

I-80 e/b at US 50 in West Sacramento.
Arguably I-80 e/b at the bridge approach/5th street in San Francisco.

SteveG1988

295 and the NJ turnpike near the Delaware Memorial Bridge, 295 has to go on flyover ramps to continue north/south.

Roads Clinched

I55,I82,I84(E&W)I88(W),I87(N),I81,I64,I74(W),I72,I57,I24,I65,I59,I12,I71,I77,I76(E&W),I70,I79,I85,I86(W),I27,I16,I97,I96,I43,I41,

bzakharin

I think NJ, but especially Delaware, have done their best to pretend I-295 doesn't exist south of the NJ Turnpike. Going north, at the 95-295 split, the NJ Turnpike is signed as prominently as I-295. All Northbound 295 pull-throughs in Delaware have "TO NJTP" signs, so it's easy for a casual traveler to think that this is a no-name connector to both 295 and the Turnpike (though 295 reassurance shields help somewhat). So the Turnpike either begins at the split or the toll plaza, and 295 begins at the split as well.

Southbound, the impression is that the Turnpike either ends at the toll plaza with the rest just being an extended ramp to the Delaware Memorial Bridge, or continues all the way to the bridge. The only overhead on the NJ side that mentions 295  has a US 40 shield in the center position, an I know people who think the bridge is just US 40. And signs like this one on NJ 140 West don't help:
https://www.google.com/maps/@39.6826534,-75.4798299,3a,15y,336.32h,87.86t/data=!3m7!1e1!3m5!1sqV7OnHd3sSuOTNvpvmAgiQ!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3DqV7OnHd3sSuOTNvpvmAgiQ%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D229.95169%26pitch%3D0!7i13312!8i6656!5m1!1e1
There is no Turnpike South at this point and the "TO I-295" is erroneous as this is a direct entrance onto 295 South. Even worse, if you follow the "Turnpike South" sign, the very next exit on 295 has a Turnpike shield and you will end up back on NJ 140

TheStranger

Quote from: Occidental Tourist on September 16, 2015, 02:26:19 AM

Arguably I-80 e/b at the bridge approach/5th street in San Francisco.

Westbound at 5th rather than eastbound - eastbound, there are no left exits from 80 until US 50 in West Sacramento. 
Chris Sampang

Occidental Tourist

Quote from: TheStranger on September 16, 2015, 02:33:17 PM
Quote from: Occidental Tourist on September 16, 2015, 02:26:19 AM

Arguably I-80 e/b at the bridge approach/5th street in San Francisco.

Westbound at 5th rather than eastbound - eastbound, there are no left exits from 80 until US 50 in West Sacramento. 

That's right.  I meant coming off the bridge.  I mixed my directions up.

By the way, is there any validity to claiming that w/b 80 through the MacArthur Maze constitutes 80 exiting off itself?  I'd argue no because it was intentionally designed as an interchange for multiplexed routes.  Of course, you could also make the same case for the 5 s/b and the 10 w/b through East LA.

Strider

Quote from: Tom958 on September 12, 2015, 05:51:23 AM
Wow, third page and nobody has mentioned I-40 on the west side of Greensboro, which ended up exiting itself despite the considerable effort and expense put into building an unTOTSO interchange.



I-73 exits itself at the I-85/US 220-421 interchange. Going north, US 220 is the mainline while I-73 exits itself via the loop ramp. Going south, US 421 (I-85 North) is the through lane as I-73 exits off going to Asheboro.

Also, at the I-40 interchange, going northbound, I-40 West/US 421 is the mainline (left exit) while I-73 North exits off to join I-840 East. (I-40 used to bypass Greensboro to the southwest and southeast of the town)

At the future I-73/I-840/Bryan Blvd, I-73 is proposed to exit off the loop to follow Bryan Blvd west to PTI airport, as well as the I-73 connector heading north to Rockingham County (under construction). as of going south, I-73 south will exit off  to join I-840 as Bryan Blvd is the mainlane.

TheStranger

Quote from: Occidental Tourist on September 16, 2015, 10:06:45 PM

By the way, is there any validity to claiming that w/b 80 through the MacArthur Maze constitutes 80 exiting off itself?  I'd argue no because it was intentionally designed as an interchange for multiplexed routes.  Of course, you could also make the same case for the 5 s/b and the 10 w/b through East LA.

I'd say that it counts at least pre-1984 because the southbound lanes to the Cypress section of the Nimitz Freeway were to the left of the route to I-80 west (as is the case now) when all of that was part of the through routing for Route 17.

I'd definitely count 5 and 10 through the East LA Interchange when considering that the only freeway to continue through the entire junction without changing names is the Santa Ana Freeway (which used to be all US 101 both north and south of that spot).
Chris Sampang

lepidopteran

In Toledo, OH, there's a T-interchange where the I-475/US-23 multiplex ends.  But while US-23 heads straight on north towards Michigan, I-475 "exits" off to head east.  This is now considered Exit 14 off of I-475, complete with a "wrong way" gore sign going NB.  I remember from many years ago there was an unnumbered gore sign going EB (one which only read "EXIT" with an arrow).

One of the SB control cities seems to have changed at some point in the last 20 years or so.  It used to read "Dayton, Columbus", as if there was one city for I-475 (actually I-75), and one for US-23.  Now it reads "Maumee, Dayton", as if US Highways now take a back seat to Interstates.

This interchange is being modified to prevent weaving patterns.
I-475/US 23 Interchange Safety Project



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