Interstates which exit off of themselves

[noelbotevera]

I-83 NB exits itself at the PA 581 interchange. You have to take a loop ramp in order to continue on I-83 NB, or else you'll be on PA 581 WB or take Exit 42 by accident, the Lemoyne exit.

[cwf1701]

I-75 at I-640 Knoxville. Going southbound, I-275 becomes the mainline as I-75 exit to join I-640 to go west of Downtown Knoxville.

[TravelingBethelite]

I-80 at the I-74/I-280 interchange, and I-72 at I-172 east of Hannibal. IG even says 72/172 is the only interchange they know of that both exit simultaneously.

[hbelkins]

I-75 at I-640 Knoxville. Going southbound, I-275 becomes the mainline as I-75 exit to join I-640 to go west of Downtown Knoxville.

Yep, but some of us are old enough to remember (there's that phrase again) when I-75 ran straight into downtown instead of along I-640.

[OracleUsr]

When was I-75 rerouted onto 640?  I was trying to remember how long 275 has been there.

[noelbotevera]

When was I-75 rerouted onto 640?  I was trying to remember how long 275 has been there.

Early 1982. I-75 was rerouted when I-640 was completed for the World's Fair in Knoxville. I-275 was created at the same time and attached to that roadway.

[OracleUsr]

Oh, okay.  I remember when we used to take I-75 into downtown to go to Lenoir City, where my uncle lives.  I remember the stub ramp on I-40 East to what is now I-640.  It went to the left rather than the current ramp.

[TheHighwayMan3561]

I-84 at Jct. I-86: https://www.google.com/maps/@42.5696784,-113.5237246,3a,75y,82.43h,86.32t/data=!3m6!1e1!3m4!1sPDPAhrGILpG9deL8FAt9bw!2e0!7i13312!8i6656

It's very rural so it doesn't cause much of a problem.

Sorry to jack the thread, but I noticed the signs say "I-86/TO I-15" with I-15 being over 60 miles away, so that got me thinking what some of the longest "Route X/To Route Y" signed distances are. Anyone know of others?

[vdeane]

A-15 is signed for the ramp from US 9 to I-87.  It's 121 miles away.

[cl94]

I-787 at NY 7/NY 787, both directions. Southbound, it's signed

[Rothman]

I-787 at NY 7/NY 787, both directions. Southbound, it's signed

I don't think I-787 exits off of itself.  How do you figure?

[vdeane]

I think he's including the "secret" designation of I-787 over the Collar City Bridge into Troy; Troy has posted a I-787 reassurance shield on the SB side despite the fact that it's theoretically unsigned.  Technically, I-787 exits itself also at the Thruway interchange (I-890 and I-690 do the same thing, and I-790 EB might; of course, I-790 exits itself at the NY 5/8/12/49 interchange; one might count I-587 too).

[Rothman]

I think he's including the "secret" designation of I-787 over the Collar City Bridge into Troy; Troy has posted a I-787 reassurance shield on the SB side despite the fact that it's theoretically unsigned.  Technically, I-787 exits itself also at the Thruway interchange (I-890 and I-690 do the same thing, and I-790 EB might; of course, I-790 exits itself at the NY 5/8/12/49 interchange; one might count I-587 too).

The strange thing is that I could see the I-787 SB to Thruway exit as counting.

[cl94]

I think he's including the "secret" designation of I-787 over the Collar City Bridge into Troy; Troy has posted a I-787 reassurance shield on the SB side despite the fact that it's theoretically unsigned.  Technically, I-787 exits itself also at the Thruway interchange (I-890 and I-690 do the same thing, and I-790 EB might; of course, I-790 exits itself at the NY 5/8/12/49 interchange; one might count I-587 too).

Correct. At least on the Troy side, much of the signage implies that I-787 begins at the eastern end of the bridge, with only a couple newer installs suggesting otherwise. I don't think anything in this thread said the Interstate had to be signed, either.

[cwf1701]

I-65 in Nashville. The Exit that I-65 use was originally the exit for I-265 before the reroute of I-65 thru Nashville.

I-465 in Indianapolis. To go south on I-465, one must exit West i-465. Of note, I-865 was originally signed I-465  and the mainline lanes was I-465 west to I-65 north.

[MASTERNC]

Not sure if these count, but there are two in Baltimore involving I-695:

- I-695 in one direction exits, while the mainline becomes I-97 south

- I-83 exits off the multiplexed I-83/I-695

[cappicard]

Southbound I-435 before the Grandview Triangle.

Far left two lanes are signed as if they're an exit to Westbound 435, but in reality they're still on the mainline.

[cappicard]

Westbound I-70 has to exit the Kansas Turnpike at Exit 183 in order to continue west in Topeka.

[cappicard]

This is sort of an Interstate exiting off itself.

I-670 westbound from I-70 in downtown KCMO is also signed as Alternate I-70. You start seeing Alternate I-70 being announced from between the Jackson and Benton Curves.

https://www.google.com/maps/@39.0813548,-94.5402311,3a,75y,334.38h,90.82t/data=!3m7!1e1!3m5!1sboc5GP1ThhV-Ev1rM493zg!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3Dboc5GP1ThhV-Ev1rM493zg%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D41.966629%26pitch%3D0!7i13312!8i6656

[cappicard]

How about I-35W (now I-135) branching off I-35 in Wichita?

[kphoger]

[tl:dr]

I-35 near Ankeny, IA
I-35 in Kansas City
I-35 at Emporia, KS
I-35 in Oklahoma City

[Ned Weasel]

Southbound I-435 before the Grandview Triangle.

Far left two lanes are signed as if they're an exit to Westbound 435, but in reality they're still on the mainline.

I really don't see how the left two lanes of SB-WB I-435 are signed as if they're an exit.

https://goo.gl/maps/vxwdwujx3RT2

Am I missing something?

If it's because MoDOT put the distance legend on the thru route here instead of on the exit sign, that is a bit unusual, but it doesn't necessarily imply WB I-435 is the exit.

https://goo.gl/maps/SPoRhPPC39p

[cappicard]

Well, to be more correct is the control city for westbound 435 is Wichita (which is over 200 miles away).


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