AARoads Forum

Rare is instance in which thru traffic has to exit off of the mainline freeway to remain on an interstate highway. One of the best (worst) examples is on I-55 in Memphis approaching the Mississippi River: https://goo.gl/maps/qQ9pH

However, as I-69 has been piecemealed across the country, there are several instances in which traffic will have to do that to remain on the new Interstate. Here are a handful of examples I've found along I-69 and Future I-69. I'm sure there are others; I'd be interested to hear about them. (Moreover, if I'm incorrect in any of these I'm sure you'll let me know. ;-) )  I'm also interested if anybody can think of another interstate which requires you to exit so many time to stay on it.

NORTHBOUND
I-69/I-55/Future I-269, near Hernando, MS: https://goo.gl/maps/jrkXL (https://goo.gl/maps/jrkXL)
I-69/I-24 near Calvert, KY: https://goo.gl/maps/Gon6j (https://goo.gl/maps/Gon6j)

SOUTHBOUND
I-69/I-24 near Calvert, KY: https://goo.gl/maps/fDCyD (https://goo.gl/maps/fDCyD)
US 45 Bypass/Purchase Parkway in Mayfield, KY: https://goo.gl/maps/nO4MJ (https://goo.gl/maps/nO4MJ)
These plans from TDOT indicate that I-155 will no longer be treated as the through route, but rather the main lanes of I-69 will curve south with a one-lane exit to I-155 at this location west of Dyersburg, TN: https://www.tn.gov/assets/entities/tdot/attachments/i-69s42.pdf (https://www.tn.gov/assets/entities/tdot/attachments/i-69s42.pdf)
I-69/I-55/Future I-269 in Hernando, MS: https://goo.gl/maps/9DWhW (https://goo.gl/maps/9DWhW)
I-69/Mississippi 304 near Tunica, MS: https://goo.gl/maps/sUcxy (https://goo.gl/maps/sUcxy)

I-90, between I-80 and OH SR 2
Elyria, Ohio
https://goo.gl/maps/cZSbj
*note I-90 only has one lane at the exits

I-76 & I-80 Junction, where the Ohio Turnpike is the through route
near Youngstown, Ohio
https://goo.gl/maps/RwUkU

Both I-76 and I-77
Akron, Ohio
https://goo.gl/maps/cqRfN

I-39 at US 20
Rockford, Illinois
https://goo.gl/maps/tp1Rh
*note I-39 has one exit lane

In Springfield, VA, you get the situation where 95 comes up from southern Fairfax County and then co-routes with the outer loop of the Beltway (495) heading through southern Alexandria. As a result, one who wishes to stay on 95 proper must exit to continue on 95. If you don't exit, it becomes 395 heading towards DC.

However (95 hoo maybe you can confirm my facts), interestingly, they don't call the ramp which lets you continue on 95 north an exit. Rather, if you stay in the middle of the carriageway and head in the same cardinal direction (with the road becoming 395), they consider it an "exit". https://www.google.com/maps/@38.7720371,-77.1820766,3a,75y,24.6h,78.76t/data=!3m6!1e1!3m4!1svdUPA1TYyqF06VwsUtzc2g!2e0!7i13312!8i6656

The same goes for southbound traffic. When you're on 395 coming southbound, if you stay on the carriageway and let it become 95 southbound, you've "exited". (https://www.google.com/maps/@38.79797,-77.1686638,3a,75y,233.61h,85.5t/data=!3m6!1e1!3m4!1seHiQv7rTZGaun1Am6n3wig!2e0!7i13312!8i6656)

Interstate H-1 westbound, at exit 19. (That was part of the excuse for turning through route HI 78 into Interstate H-201.)

Interstate A-1 (state route AK 1) eastbound, at its junction with Interstate A-4 (state route AK 3).

One example each from two states with very few freeways, so the lower-48 list might be pretty long.

I seem to recall this happening on I-39 South either in or just south of Rockford.

I-80 at Lake Station, IN and Wetzl, OH
I-90 at Elyria, OH
I-70 at Breezewood (more than one)
I-76 at Wetzl, OH

Quote from: tidecat on September 09, 2015, 07:12:14 PM
I seem to recall this happening on I-39 South either in or just south of Rockford.

Yep. Headed southbound on I-39 US 20 is the mainline, and I-39/US 51 exit off.

I-75 in Detroit (I-75 changes from the fisher Freeway to the Chrysler Freeway). NB mainline (Fisher) ends at Gratiot Ave and Southbound mainline (Chrysler) becomes I-375.

Quote from: english si on September 09, 2015, 07:31:19 PM
I-80 at Lake Station, IN and Wetzl, OH

And Colona, IL, Hazel Crest, IL, and West Des Moines, IA. Also, I-74 does this twice in a row in Moline, IL and Colona, IL, and then again down the road in Indianapolis.

Because of how it's defined, I-195 in Virginia has to exit off itself to continue southbound. The mainline becomes VA 76.

At the I-95/I-93 junction in Canton MA:  If you're headed south on I-95, you must exit the main highway to remain on 95.  Continuing straight (which is signed as the "exit") puts you on I-93 north.  (And no, let's not start another 128 discussion.)  Going north on 95, the highway "ends" and you do a 270-degree turn to remain on 95 north.

I-5 CA: at the East LA interchange (both ways), at CA 99 (northbound), at I-580 (northbound).

I-10 East in New Orleans at US 90/90B. Also I-10 East in Baton Rouge at I-110.

I-70 East at I-35 (eastern end of overlap) in KC's Downtown Loop. Also, I-70 West at I-670 entering the Loop.

I-35 where it exits the Kansas Turnpike at I-335.

Quote from: AlexandriaVA on September 09, 2015, 06:32:36 PM
In Springfield, VA, you get the situation where 95 comes up from southern Fairfax County and then co-routes with the outer loop of the Beltway (495) heading through southern Alexandria. As a result, one who wishes to stay on 95 proper must exit to continue on 95. If you don't exit, it becomes 395 heading towards DC.

However (95 hoo maybe you can confirm my facts), interestingly, they don't call the ramp which lets you continue on 95 north an exit. Rather, if you stay in the middle of the carriageway and head in the same cardinal direction (with the road becoming 395), they consider it an "exit". https://www.google.com/maps/@38.7720371,-77.1820766,3a,75y,24.6h,78.76t/data=!3m6!1e1!3m4!1svdUPA1TYyqF06VwsUtzc2g!2e0!7i13312!8i6656

The same goes for southbound traffic. When you're on 395 coming southbound, if you stay on the carriageway and let it become 95 southbound, you've "exited". (https://www.google.com/maps/@38.79797,-77.1686638,3a,75y,233.61h,85.5t/data=!3m6!1e1!3m4!1seHiQv7rTZGaun1Am6n3wig!2e0!7i13312!8i6656)

Yes, I-95 through Springfield does not exit off of itself.  When the interchange was reconstructed, there was a deliberate effort to make I-95 the through movement via those big and soaring ramps.

No one mentioned yet I-83 S Bound at I-283 at the infamous Eisenhower Interchange near Harrisburg, PA.

I-76/276/PA Turnpike at Valley Forge; the Turnpike is the through-route.

Quote from: SidS1045 on September 09, 2015, 10:51:02 PM
At the I-95/I-93 junction in Canton MA:  If you're headed south on I-95, you must exit the main highway to remain on 95.  Continuing straight (which is signed as the "exit") puts you on I-93 north.  (And no, let's not start another 128 discussion.)  Going north on 95, the highway "ends" and you do a 270-degree turn to remain on 95 north.

The Canton "death curve" from I-95 north to I-95 north is planned to be replaced with a flyover:

http://www.massdot.state.ma.us/highway/HighlightedProjects/cantoninterchange.aspx

I-680 at both ends of it's concurrence with I-29.

I find the cloverleaf at the south end to be particularly outdated and scary.

I-95 South exits itself if you are on the lower level of the George Washington Bridge / Express lanes. I-80 (which begins here) is the through route. From the upper level / local lanes, it's more of a 50/50 split, but I-95 is on the left, so it can be considered the through route. Then, the currently unsigned I-95 exits itself from the NJ Turnpike onto the PA Extension (Exit 6). Presumably once the PA Turnpike Interchange is completed, it will exit itself again at that interchange and onto the existing I-95.

I-87 exits itself Southbound where I-287 East is the through route. I-676 arguably exits itself just east of the Ben Franklin Bridge where US 30 is the through route.

Quote from: pianocello on September 09, 2015, 08:42:29 PM

Quote from: english si on September 09, 2015, 07:31:19 PM
I-80 at Lake Station, IN and Wetzl, OH

And Colona, IL, Hazel Crest, IL, and West Des Moines, IA. Also, I-74 does this twice in a row in Moline, IL and Colona, IL, and then again down the road in Indianapolis.

I-74 does it again in Bloomington, at the northern interchange with I-55.  The southern one is more of a split.

Quote from: TheHighwayMan394 on September 09, 2015, 07:38:24 PM

Quote from: tidecat on September 09, 2015, 07:12:14 PM
I seem to recall this happening on I-39 South either in or just south of Rockford.

Yep. Headed southbound on I-39 US 20 is the mainline, and I-39/US 51 exit off.

I-39 does it twice in Rockford, once off I-90, and then off US-20.  The first one was fixed so it works more like a split.

Then, I-90 does it itself off the Dan Ryan Expressway in Chicago when it goes onto the Chicago Skyway.

I-94 does it further north when leaving the Edens Expressway (US-41).

Quote from: mwb1848 on September 09, 2015, 05:53:40 PM
Rare is instance in which thru traffic has to exit off of the mainline freeway to remain on an interstate highway. One of the best (worst) examples is on I-55 in Memphis approaching the Mississippi River: https://goo.gl/maps/qQ9pH

However, as I-69 has been piecemealed across the country, there are several instances in which traffic will have to do that to remain on the new Interstate. Here are a handful of examples I've found along I-69 and Future I-69. I'm sure there are others; I'd be interested to hear about them. (Moreover, if I'm incorrect in any of these I'm sure you'll let me know. ;-) )  I'm also interested if anybody can think of another interstate which requires you to exit so many time to stay on it.

NORTHBOUND
I-69/I-24 near Calvert, KY: https://goo.gl/maps/Gon6j (https://goo.gl/maps/Gon6j)

SOUTHBOUND
I-69/I-24 near Calvert, KY: https://goo.gl/maps/fDCyD (https://goo.gl/maps/fDCyD)
US 45 Bypass/Purchase Parkway in Mayfield, KY: https://goo.gl/maps/nO4MJ (https://goo.gl/maps/nO4MJ)

Both of those exits (I-24/Purchase Parkway and US 45 Bypass/Purchase Parkway) are going to be rebuilt to allow for through high-speed movements for future I-69.

I saw plans (including signage) posted on KYTC's Division of Construction Procurement site yesterday.

Interstate 80 does this twice in Northern California: westbound at the MacArthur Maze, both directions in West Sacramento at US 50/Business 80.  Prior to 1968, when 80 was slated to continue to Golden Gate Park, it also exited off itself westbound at the Central Freeway in San Francisco.  (Prior to 1982, Interstate 80 took ramps to continue from today's US 50 to what was pre-1964 US 99E, see I-305 entry here)

I-280 arguably does this at the north split with Route 1 in Daly City (Route 1 north of there to the Presidio was the originally proposed I-280 route until 1968, with the north portion of the Junipero Serra Freeway today existing up to Brotherhood Way) when it switches over to the Southern Freeway.  Could even make a second case for this at US 101 going northbound in San Francisco, as pre-1964 the left lanes that lead to the Bayshore Freeway were the through lanes for US 101.

I-5 southbound continues to the right of the exit for I-805 south in San Diego.

I-15 presently uses ramps to split from I-215 in Cajon (as 215 is the original 15 routing and also was part of the old US 395 through route).

I-10 uses ramps to exit off the San Bernardino Freeway (and continue onward on the Golden State Freeway & vice versa) at the north I-5 junction, then uses a ramp westbound to continue onto the Santa Monica Freeway.  In Beaumont, westbound I-10 exits from the right side while the left lanes continue for Route 60 west (in what used to be a split of the old US 60/70/99 concurrency).  (In addition, the Santa Monica Freeway was built with the leftmost eastbound lanes at the 110 junction ramping off towards the Harbor Freeway north)

Unsigned I-305 possibly exits off of US 50 to continue along the 1960s portion of former I-80 (current Business 80/Route 51) right before the substandard bridge over the American River.

I-580 does this multiple times:

- eastbound at I-205
- both directions at I-238
- westbound at the MacArthur Maze (formerly the through route for US 50)
- westbound at the Hoffmann Split in Albany (pre-1997, 580 (old Route 17) had the through lanes here and 80 (old US 40) split from the right)

The 680/780 split in Benicia has the two left lanes on northbound 680 leading off towards 780 west.  (Though this is not the original bridge or interchange here, pre-1976 this was the through route for 680 with Route 21 continuing on to Cordelia)

I-210 and the Foothill Freeway uses a ramp westbound where it connects with Route 134 and the 710 stub in Pasadena.

I-215 southbound in Moreno Valley splits on the right from Route 60 eastbound, with 60 as the through lanes.  In Riverside, both directions of 215 then use right-side ramps at the junction with Route 91.

At I-710's southernmost extent, both directions use ramps to depart from the Seaside Freeway (where the through lanes continue east as Ocean Boulevard into Long Beach).

Oklahoma City has a few instances:
I-35 at I-40/I-235 (both directions, one lane ramps)
I-44 East at OK 66 & OK 74
I-35/I-44 at I-44 East (Turner Turnpike), one lane ramps in both directions connect I-44/Turner Turnpike to/from I-35

And my soon-to-be home area of Columbus, Ohio has this instance at the west junction of I-70 & I-71, where I-71 traffic is limited to one lane in each direction when it exits to/from I-70.

Portland, OR:

I-84 westbound exits off itself at exit 9 (I-205):
https://www.google.com/maps/@45.5475747,-122.5487981,3a,75y,275.19h,82.55t/data=!3m6!1e1!3m4!1sYnWfRWgBlErlBOvj28b83Q!2e0!7i13312!8i6656?hl=en

I-5 arguably exits off itself at its southern junction with I-405:
https://www.google.com/maps/@45.4977158,-122.6732436,3a,75y,2.07h,92.41t/data=!3m6!1e1!3m4!1ssTW2NfFurCyLBXCZEn_SEA!2e0!7i13312!8i6656?hl=en

...and then immediately I-405 northbound exits off itself, because the through route was originally US99:
https://www.google.com/maps/@45.5021938,-122.6736639,3a,75y,342.8h,82.66t/data=!3m7!1e1!3m5!1sTsuK1RqvyjFBrrItzxubBQ!2e0!5s20140901T000000!7i13312!8i6656?hl=en

https://farm6.staticflickr.com/5803/20678292043_0eda9db5cf_c.jpg

Here is one on I-49 near Joplin, MO.  Incidentally, it again exits itself upon splitting from I-44, so it does so twice.

Quote from: cpzilliacus on September 10, 2015, 01:10:05 AM

Quote from: AlexandriaVA on September 09, 2015, 06:32:36 PM
In Springfield, VA, you get the situation where 95 comes up from southern Fairfax County and then co-routes with the outer loop of the Beltway (495) heading through southern Alexandria. As a result, one who wishes to stay on 95 proper must exit to continue on 95. If you don't exit, it becomes 395 heading towards DC.

However (95 hoo maybe you can confirm my facts), interestingly, they don't call the ramp which lets you continue on 95 north an exit. Rather, if you stay in the middle of the carriageway and head in the same cardinal direction (with the road becoming 395), they consider it an "exit". https://www.google.com/maps/@38.7720371,-77.1820766,3a,75y,24.6h,78.76t/data=!3m6!1e1!3m4!1svdUPA1TYyqF06VwsUtzc2g!2e0!7i13312!8i6656

The same goes for southbound traffic. When you're on 395 coming southbound, if you stay on the carriageway and let it become 95 southbound, you've "exited". (https://www.google.com/maps/@38.79797,-77.1686638,3a,75y,233.61h,85.5t/data=!3m6!1e1!3m4!1seHiQv7rTZGaun1Am6n3wig!2e0!7i13312!8i6656)

Yes, I-95 through Springfield does not exit off of itself.  When the interchange was reconstructed, there was a deliberate effort to make I-95 the through movement via those big and soaring ramps.

One could probably debate how the average motorist views it. That is, the I-95 thru movements are not signed as "exits." But the two flyovers carrying I-95 are two lanes each, while other movements at that interchange have as many as four lanes. If you're on the Inner Loop (I-95 South/I-495 West), four lanes continue straight on the Beltway and two other lanes bear left onto the I-95 flyover. The four lanes are signed on some (but not all!) signs as "Exit 170A" on the theory you're "exiting" I-95 onto I-495. I'm 100% certain most motorists don't view it that way, regardless of whether I-95 "should" carry a higher status than I-495.

I believe Maryland's companion interchange near College Park doesn't sign the Beltway thru movements as an "exit."

Should not the road with the most lanes be the through route, and not the straight road?  If both have the same lanes each way then neither exits sort of like SB I-295 at I-76 before the direct connection project took place where 3 lane I-295 split into the two lane left exit that continued straight and the two right lanes (where the center lane split into two) veered to the right. The two through lanes veered to the right to make it look like an exit of itself, but considering its equal to the other road going straight in lanes, I would say that is an equal split and not one road exiting the other, although technically I-76 is really an exit from I-295 though.

One of the absolute worst:

I-10 WB in San Antonio:
https://goo.gl/maps/NkGXE

At least in the EB configuration, I-35 SB continues in the mainlanes:
https://goo.gl/maps/L3yF3

Then there is I-410 at the NE interchange of I-35.  The main beltway not only does a meaningless dogleg, but narrows to one lane to go SB from EB and from NB to WB at the North end of the two interstate concurrency there.

Quote from: roadman65 on September 10, 2015, 01:53:55 PM
Should not the road with the most lanes be the through route, and not the straight road?  If both have the same lanes each way then neither exits sort of like SB I-295 at I-76 before the direct connection project took place where 3 lane I-295 split into the two lane left exit that continued straight and the two right lanes (where the center lane split into two) veered to the right. The two through lanes veered to the right to make it look like an exit of itself, but considering its equal to the other road going straight in lanes, I would say that is an equal split and not one road exiting the other, although technically I-76 is really an exit from I-295 though.

When the number of lanes is equal, it's down to other criteria, such as whether it's a center lane split or an extra lane being added on the right/left. For example, where the Atlantic City Expressway begins at NJ 42, NJ 42 feels like the through route because there is an extra lane added on the left for the AC Expressway exiting. If one of the roads leaves at a substantial curve, while the other is relatively straight, the former feels like an exit. This is the case with I-55 as mentioned by the OP. I'd argue that that was also the case for the 295/76/42 situation until they were split up. In fact, I-295 still feels like a ramp through that area.

Then you might as well consider I-280 in Newark, NJ as one as you have to not only take a two lane mainline bearing off to the right of a three lane exit ramp for First Street, but the two through lanes continuing for I-280 are lanes added from the Garden State Parkway/Clinton Street merge.  In reality you must shift over to all new travel lanes going EB or else if you remain in any of the three lanes of I-280 from its conception, you will find yourself exiting onto First Street and off the interstate.

I-676 in Camden right off the foot of the Ben Franklin Bridge exits off the mainline (US 30) to get to the North-South Freeway.

I-87, both directions, on either side of the I-90 overlap
I-90 when leaving the Thruway (EB at exit 24 and WB at exit B1)
I-390 SB at I-590

Oh yes, how could I forget I-83 S Bound at PA 581 as well.   Also its northbound counterpart exits itself and even with the new N Bound upgrade, still it will go from the Harrisburg-Baltimore Expressway to the Harrisburg Expressway (Capitol Beltway) as a glorified ramp when completed.

Quote from: roadman65 on September 10, 2015, 03:12:33 PM
Then you might as well consider I-280 in Newark, NJ as one as you have to not only take a two lane mainline bearing off to the right of a three lane exit ramp for First Street, but the two through lanes continuing for I-280 are lanes added from the Garden State Parkway/Clinton Street merge.  In reality you must shift over to all new travel lanes going EB or else if you remain in any of the three lanes of I-280 from its conception, you will find yourself exiting onto First Street and off the interstate.

Well, yes, I would consider that. I forgot about that one since it's been a while since I've been there.
As you yourself said:

Quote from: roadman65 on September 10, 2015, 01:53:55 PM
Should not the road with the most lanes be the through route, and not the straight road? 

So this qualifies by any criteria

Bottom line is that if non freeway number routes can turn at intersections where the main road goes straight with more lanes, then so can interstates exit themselves with less lanes than the through road numbered as an exit.

Also I-295 N Bound entering New Jersey from Delaware exits US 40, however NJDOT did not assign exit numbers for US 40 E Bound, but only for NJ 49 and US 130.  I-295 is two lanes and last time I was there it was two for US 40.  Being US 40 is the main freeway here with I-295 curving out of the way with US 40 W Bound long side of the US 40 E Bound lanes we can simply say that.

I guess bz I do really agree with you there as far as being an even split.  Its iffy at best.

Quote from: bzakharin on September 10, 2015, 10:52:21 AM
I-95 South exits itself if you are on the lower level of the George Washington Bridge / Express lanes. I-80 (which begins here) is the through route. From the upper level / local lanes, it's more of a 50/50 split, but I-95 is on the left, so it can be considered the through route. Then, the currently unsigned I-95 exits itself from the NJ Turnpike onto the PA Extension (Exit 6). Presumably once the PA Turnpike Interchange is completed, it will exit itself again at that interchange and onto the existing I-95.

I-87 exits itself Southbound where I-287 East is the through route. I-676 arguably exits itself just east of the Ben Franklin Bridge where US 30 is the through route.

I'd say 95 South also exits itself where the New England Thruway meets 695.

And of course, the BQE going north (nominal west) infamously exits itself via a little ramp where through traffic continues to the Battery Tunnel, backing ramp traffic way up the right lanes of the BQE.

Honorable mention for a route that no longer qualifies: I-95 used to exit from itself three times in Maine. Once onto what is now I-495, a few seconds later onto what is now I-295, then a third time up at where what is now I-295 rejoins the Maine Turnpike.

Regarding I-278, it also has those little single-lane ramps southeast of the Triboro Bridge where it briefly connects to Grand Central Parkway.

Thinking of I-278 reminds me of how I-395 in DC exits off itself, practically speaking, to connect between the Southwest—Southeast Freeway and the Third Street Tunnel. As with the Springfield Interchange mentioned earlier in the thread, it's not signed as an exit; eastbound, there's a new exit number to continue on the Freeway onto I-695, though nobody thinks of it as an "exit." The northbound I-395 mainline has a very brief single-lane spot as you curve down towards the tunnel and the left lane exits to D Street SW.

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.

Quote from: doorknob60 on September 11, 2015, 04:06:34 PM
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.

It's on 30.

Quote from: noelbotevera on September 11, 2015, 04:07:07 PM

Quote from: doorknob60 on September 11, 2015, 04:06:34 PM
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.

It's on 30.

Yes it is US-30, and Google for some reason puts that as the primary route, but it's also still I-84 coming into that interchange, I-86 if you continue straight, and I-84 if you exit.

And at the other end, I-15 exits off itself, though this one is a multiplex between I-84 and I-15 so it's not as much of an example (plus the exit is 2 lanes, not 1): https://www.google.com/maps/@41.7007175,-112.1842679,3a,75y,301.29h,84.96t/data=!3m7!1e1!3m5!1sQd57QicLcDy-iG7tw_TEBg!2e0!5s20130801T000000!7i13312!8i6656

Quote from: doorknob60 on September 11, 2015, 04:08:47 PM

Quote from: noelbotevera on September 11, 2015, 04:07:07 PM

Quote from: doorknob60 on September 11, 2015, 04:06:34 PM
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.

It's on 30.

Yes it is US-30, and Google for some reason puts that as the primary route, but it's also still I-84 coming into that interchange, I-86 if you continue straight, and I-84 if you exit.

And at the other end, I-15 exits off itself, though this one is a multiplex between I-84 and I-15 so it's not as much of an example (plus the exit is 2 lanes, not 1): https://www.google.com/maps/@41.7007175,-112.1842679,3a,75y,301.29h,84.96t/data=!3m7!1e1!3m5!1sQd57QicLcDy-iG7tw_TEBg!2e0!5s20130801T000000!7i13312!8i6656

US 30 might be listed there because it continues onto I-86, thus both sections are US 30.

In addition to those mentioned by the OP, I-69 must exit onto / from I-465 at both intersections at Indianapolis.

I-75 and I-71 in OH.
I-71 at I-75 in KY.
I-74 at I-275 east of Miamitown.
I-275 at I-74 west of Miamitown.
Each end of the I-70/I-71 concurrency in Columbus.
Each end of the I-85/I-75 concurrency in Atlanta.
Each end of the I-75/I-64 concurrency in Lexington.

I-75 SB in Knoxville, TN, where it joins I-640.
Before this was built, I-75 NB left the I-40 concurrency via a rather tight (and easy-to-miss) loop ramp.

I thought of more instances on I-69.  Coming out of Port Huron, you have to exit the 69/94 concurrency to continue on I-69 west.  And on the west side of Lansing, I-69 exits from I-96 in either direction.

Quote from: iBallasticwolf2 on September 11, 2015, 05:15:16 PM
I-75 and I-71 in OH.
I-71 at I-75 in KY.
I-74 at I-275 east of Miamitown.
I-275 at I-74 west of Miamitown.
Each end of the I-70/I-71 concurrency in Columbus.
Each end of the I-85/I-75 concurrency in Atlanta.
Each end of the I-75/I-64 concurrency in Lexington.

That's not how it works. That's now how any of this works.

"Exit from self" means that the interstate leaves the mainline via a ramp, while the through route continues under another designation. A split between two signed interstates wouldn't count. However, a situation like I-76 eastbound at I-277 would. The through route continues as I-277 (semicolon) to stay on I-76 you have to take a ramp.

Quote from: hbelkins on September 11, 2015, 09:55:33 PM

Quote from: iBallasticwolf2 on September 11, 2015, 05:15:16 PM
I-75 and I-71 in OH.
I-71 at I-75 in KY.
I-74 at I-275 east of Miamitown.
I-275 at I-74 west of Miamitown.
Each end of the I-70/I-71 concurrency in Columbus.
Each end of the I-85/I-75 concurrency in Atlanta.
Each end of the I-75/I-64 concurrency in Lexington.

That's not how it works. That's now how any of this works.

"Exit from self" means that the interstate leaves the mainline via a ramp, while the through route continues under another designation. A split between two signed interstates wouldn't count. However, a situation like I-76 eastbound at I-277 would. The through route continues as I-277 (semicolon) to stay on I-76 you have to take a ramp.

I-71 at SR 315 counts. Freeway continues as SR 315 while NB I-71 traffic has 1/4 mile to merge into an auxiliary lane added at Exit 105.

I'll add:
-I-90 WB at I-271
-I-90 (both directions) at I-71
-I-70 at I-670
-I-76 and I-80 where they intersect
-I-86 WB at I-390
-I-95 at I-278/I-295
-I-95 at I-695
-I-278 WB at Grand Central Parkway (don't think this was mentioned)

• I-90 just east of Billings (through movement is to I-94)
• I-80 west of Des Moines and I-35 north of Des Moines (through movements go to either end of I-235)

I-5 northbound has to exit itself at the split with CA 99 at Wheeler Ridge (Exit 221). Also I-5 northbound has to exit itself at the I-580 junction near Vernalis (Exit 446).

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

Wow, third page and nobody has mentioned I-40 on the west side of Greensboro (https://www.google.com/maps/@36.0706061,-79.9299435,3a,75y,98.69h,92.14t/data=!3m6!1e1!3m4!1sjMWXcyXitypUlx0Dxep8IA!2e0!7i13312!8i6656), which ended up exiting itself despite the considerable effort and expense put into building an unTOTSO interchange.

I-43 at the Hale Interchange SW of Milwaukee:

southbound:  https://www.google.com/maps/@42.9625866,-88.033396,3a,75y,294.4h,91.86t/data=!3m6!1e1!3m4!1suZXgT8SmEgglL-mXATscSA!2e0!7i13312!8i6656

northbound:  They have since moved the exit designation so the "through traffic" is a left exit, but to stay on I-43, one must weave onto an auxiliary lane and take a 1-lane exit
https://www.google.com/maps/@42.9575607,-88.0435705,3a,75y,59.48h,99.83t/data=!3m6!1e1!3m4!1sYqyHvbDhPPtmhszyFJoN3A!2e0!7i13312!8i6656
https://www.google.com/maps/@42.9610304,-88.0394016,3a,75y,32.12h,88.71t/data=!3m6!1e1!3m4!1sZ2uQRC2NeUHSrIJxFvXwAQ!2e0!7i13312!8i6656

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.

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

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.

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

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.

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.

I-49 SB at AR 151 in Texarkana, AR

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.

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.

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.

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)

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!

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.

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.

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.

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

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

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. 

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.

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 (https://www.google.com/maps/@36.0706061,-79.9299435,3a,75y,98.69h,92.14t/data=!3m6!1e1!3m4!1sjMWXcyXitypUlx0Dxep8IA!2e0!7i13312!8i6656), 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.

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).

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 (http://"http://www.dot.state.oh.us/districts/D02/I475US23InterchangeSafetyProject/Pages/default.aspx")

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.

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.

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.

Quote from: cwf1701 on September 19, 2015, 09:39:54 PM
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.

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

Quote from: OracleUsr on September 19, 2015, 10:57:10 PM
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.

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.

Quote from: doorknob60 on September 11, 2015, 04:06:34 PM
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?

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

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

Quote from: cl94 on September 20, 2015, 09:01:24 PM
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?

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).

Quote from: vdeane on September 21, 2015, 12:49:43 PM
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. :D

Quote from: vdeane on September 21, 2015, 12:49:43 PM
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.

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.

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

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.

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

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

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

[tl:dr]

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

Quote from: cappicard on October 05, 2015, 08:56:42 AM
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

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


iPhone