# What piece of US interstate highway has the MOST different interstate designations? **URL:** \ **Category:** Factual Questions\ **Created:** [March 16, 2021, 5:37pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037 "2021-03-16T17:37:46Z")\ **Posts on this page:** 19\ **Page:** 1
**Author:** ![Qadgop\_the\_Mercotan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/qadgop_the_mercotan/32/83_2.png) [@Qadgop\_the\_Mercotan](https://boards.straightdope.com/u/Qadgop_the_Mercotan)\ **Post date:** [March 16, 2021, 5:37pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/1 "2021-03-16T17:37:46Z")
A post in the [cities served by 3 or more interstates](https://boards.straightdope.com/t/us-cities-served-by-3-or-more-primary-interstate-highways/933983) thread brought this question to mind. For example: the stretch of interstate running East and West on the south side of Milwaukee is designated as I-43, I-41, and I-894. That’s a grand total of 3 different interstate highways using the exact same stretch of road. Also notable about that stretch is the fact that one is going in I-43 Southbound and I-41 Northbound when going westbound on it, and vice-versa when going eastbound. Any routes with 4 or more different interstate designations on the exact same piece of roadway? ---
**Author:** ![Joey\_P](https://avatars.discourse-cdn.com/v4/letter/j/919ad9/32.png) [@Joey\_P](https://boards.straightdope.com/u/Joey_P)\ **Post date:** [March 16, 2021, 6:04pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/2 "2021-03-16T18:04:14Z")
> [@Qadgop\_the\_Mercotan](#): > > Also notable about that stretch is the fact that one is going in I-43 Southbound and I-41 Northbound when going westbound on it, and vice-versa when going eastbound. Years ago I called 911 for some reason or another (accident or drunk driver or something), when the dispatcher asked where I was I said I-94 East, just past College Ave and thus started a back and forth of “Yes, I’m really on I-94 East just past college” and her saying “I-94 doesn’t go east”. Granted the back and forth was only one or two times before I realized I needed to tell her that I was headed south on I-94. But had I been from out of town or otherwise unfamiliar with the area, it could have been an issue since the signs say EAST 94 and don’t accurately reflect your direction of travel. I always figured that must be really confusing for people further South (ie Racine/Kenosha/Northern Illinois) that may not be aware the 94 actually does go East and West for the Madison/Milwaukee stretch. I always think about which way I’d be going on that part of the freeway to remember that 94E goes South and 94W goes North instead of it just being something you have to memorize. ---
**Author:** ![OldGuy](https://avatars.discourse-cdn.com/v4/letter/o/3bc359/32.png) [@OldGuy](https://boards.straightdope.com/u/OldGuy)\ **Post date:** [March 16, 2021, 9:58pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/3 "2021-03-16T21:58:12Z")
These are called highway concurrences. I know of no three-way Interstate concurrence, though one comes close. I-94 and I-80 are the same south of Chcago. Whn I-94 turns north into Chicago the continuing road becomes I-80 and I-294 bypass so there might be a tiny bit at the interchange that’s all three. The longest two-way concurrency is I-80 and I-90 for 265 miles in Ohio west of Cleveland and across Indiana. ---
**Author:** ![OldGuy](https://avatars.discourse-cdn.com/v4/letter/o/3bc359/32.png) [@OldGuy](https://boards.straightdope.com/u/OldGuy)\ **Post date:** [March 16, 2021, 10:41pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/4 "2021-03-16T22:41:27Z")
> [@Qadgop\_the\_Mercotan](#): > > For example: the stretch of interstate running East and West on the south side of Milwaukee is designated as I-43, I-41, and I-894. That’s a grand total of 3 different interstate highways using the exact same stretch of road. I’ll believe you but that doesn’t seem to be what google maps indicates. Going north on I-94, I-41, the latter cuts off to the west while I-94 continues East for a bit then north. I-43 joins I-94 just where I-41 leaves it. That’s why I-43 and I-41 share a roadway. ---
**Author:** ![Qadgop\_the\_Mercotan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/qadgop_the_mercotan/32/83_2.png) [@Qadgop\_the\_Mercotan](https://boards.straightdope.com/u/Qadgop_the_Mercotan)\ **Post date:** [March 16, 2021, 11:11pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/5 "2021-03-16T23:11:21Z")
> [@OldGuy](#): > > I’ll believe you but that doesn’t seem to be what google maps indicates. Per [Interstate-guide.com’s article on it](https://www.interstate-guide.com/i-894-wi/), I-894 is co-signed with I-41/43 on the south leg of the Bypass. Here’s a pic going south on I-43 and entering onto I-41 and I-894 showing the signage for all 3. [3 interstate concurrence](https://i.postimg.cc/DzgQtQMk/entering-I-41-I-43-I-894.jpg) And thanks for the info, I’m glad to know the technical term, _concurrence_! ---
**Author:** ![Qadgop\_the\_Mercotan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/qadgop_the_mercotan/32/83_2.png) [@Qadgop\_the\_Mercotan](https://boards.straightdope.com/u/Qadgop_the_Mercotan)\ **Post date:** [March 16, 2021, 11:34pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/6 "2021-03-16T23:34:30Z")
Another example of the signage on this [3 interstate concurrence plus State route 41!](https://i.postimg.cc/wBf21cc5/riding-on-I-41-43-894.jpg) I like how you’re driving north, south, west AND north. ---
**Author:** ![OldGuy](https://avatars.discourse-cdn.com/v4/letter/o/3bc359/32.png) [@OldGuy](https://boards.straightdope.com/u/OldGuy)\ **Post date:** [March 16, 2021, 11:44pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/7 "2021-03-16T23:44:56Z")
Gotcha. I misread obviously I was describing I-94 not I-894 ---
**Author:** ![mcgato](https://avatars.discourse-cdn.com/v4/letter/m/ac8455/32.png) [@mcgato](https://boards.straightdope.com/u/mcgato)\ **Post date:** [March 17, 2021, 12:48pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/8 "2021-03-17T12:48:03Z")
It looks like there is a stretch north of Madison, WI, where I-90 and 1-94 merge, and I-39 begins. ---
**Author:** ![Qadgop\_the\_Mercotan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/qadgop_the_mercotan/32/83_2.png) [@Qadgop\_the\_Mercotan](https://boards.straightdope.com/u/Qadgop_the_Mercotan)\ **Post date:** [March 17, 2021, 1:00pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/9 "2021-03-17T13:00:24Z")
I-39 does indeed overlap I-90 and I-94 from Madison to Portage, another triple concurrence. Surely they must occur outside of WI somewhere too! ---
**Author:** ![Jas09](https://avatars.discourse-cdn.com/v4/letter/j/d07c76/32.png) [@Jas09](https://boards.straightdope.com/u/Jas09)\ **Post date:** [March 17, 2021, 2:56pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/10 "2021-03-17T14:56:43Z")
There is a decent stretch east of St. Louis with two interstates, but never 3. Based on this infographic, the only triple solid lines I see are indeed in WI. [https://www.visualcapitalist.com/wp-content/uploads/2017/10/interstate-highways-map.html](https://www.visualcapitalist.com/wp-content/uploads/2017/10/interstate-highways-map.html) This only shows major interstates, so there may be a spot where a spur overlaps one of thesdoubles, but I couldn’t find one in any of the cities I’m familiar enough with to poke around. ---
**Author:** ![bibliophage](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bibliophage/32/7615_2.png) [@bibliophage](https://boards.straightdope.com/u/bibliophage)\ **Post date:** [March 17, 2021, 3:08pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/11 "2021-03-17T15:08:07Z")
Sometimes you get a bridge and approaches shared between different interstates. Until 2014, the Poplar Street Bridge over the Mississippi River between St. Louis, Missouri, and East St. Louis, Illinois carried I-70, I-64, and I-55 concurrently. In 2014, I-70 was re-routed over a new bridge farther north. ---
**Author:** ![MikeS](https://avatars.discourse-cdn.com/v4/letter/m/919ad9/32.png) [@MikeS](https://boards.straightdope.com/u/MikeS)\ **Post date:** [March 18, 2021, 11:54am UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/12 "2021-03-18T11:54:30Z")
It is suspected (but has not been officially announced) that when the Indiana DOT finally finishes the southern section of I-69, it will connect the new interstate to the northern section of I-69 by officially designating part of the southern section of the Indianapolis beltway (I-465) as I-69 as well. Another part of the southern section of I-465 is already concurrent with I-74. This would lead to a triple concurrence for about 14 miles on the south side of Indy. Completion of the southern section of I-69 is expected around 2025, so check back then. ---
**Author:** ![jjakucyk](https://avatars.discourse-cdn.com/v4/letter/j/3d9bf3/32.png) [@jjakucyk](https://boards.straightdope.com/u/jjakucyk)\ **Post date:** [March 18, 2021, 12:51pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/13 "2021-03-18T12:51:24Z")
Seems like a question for the [AARoads forum](https://www.aaroads.com/forum/index.php?board=12.0). It’s almost entirely trivia. ---
**Author:** ![Qadgop\_the\_Mercotan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/qadgop_the_mercotan/32/83_2.png) [@Qadgop\_the\_Mercotan](https://boards.straightdope.com/u/Qadgop_the_Mercotan)\ **Post date:** [March 18, 2021, 6:03pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/14 "2021-03-18T18:03:59Z")
@jjakucyk wow, looks FUN! thanks! @Jas09 Nice graphic, but it does leave out all the 3 digit interstate spurs. Thanks for providing it. @bibliophage Sorry we lost that old concurrence @MikeS I can wait. ---
**Author:** ![dtilque](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@dtilque](https://boards.straightdope.com/u/dtilque)\ **Post date:** [March 18, 2021, 9:14pm UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/15 "2021-03-18T21:14:58Z")
This isn’t a triple concurrance, but I thought it interesting: West of Lansing MI, there’s a roughly 5-mile long concurrence of I-69 with I-96. Must make it fun for lysdexics. ---
**Author:** ![PoppaSan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/poppasan/32/189_2.png) [@PoppaSan](https://boards.straightdope.com/u/PoppaSan)\ **Post date:** [March 22, 2021, 3:40am UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/16 "2021-03-22T03:40:43Z")
> [@Qadgop\_the\_Mercotan](#): > > Per [Interstate-guide.com’s article on it](https://www.interstate-guide.com/i-894-wi/), I-894 is co-signed with I-41/43 on the south leg of the Bypass. I wonder how much longer I-894 will still exist as its entire run is now the same roadway as I-41 > [@](#): > > Here’s a pic going south on I-43 and entering onto I-41 and I-894 showing the signage for all 3. > [3 interstate concurrence](https://i.postimg.cc/DzgQtQMk/entering-I-41-I-43-I-894.jpg) I’ve driven that route a handful of times. ---
**Author:** ![kenobi\_65](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/kenobi_65/32/13178_2.png) [@kenobi\_65](https://boards.straightdope.com/u/kenobi_65)\ **Post date:** [March 22, 2021, 3:51am UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/17 "2021-03-22T03:51:35Z")
> [@PoppaSan](#): > > FYI 41 & 43 run concurrent again north of Green Bay for a little way. Actually, I don’t think that they do. I-43’s northern terminus is at the point where it meets I-41 in the village of Howard, just NW of the city of Green Bay (a point that is about 2 miles away from my father’s old hardware store). At that same interchange, I-41 ceases to have an Interstate designation, and reverts to being only US 41 and US 141 from that point north. ---
**Author:** ![PoppaSan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/poppasan/32/189_2.png) [@PoppaSan](https://boards.straightdope.com/u/PoppaSan)\ **Post date:** [March 22, 2021, 3:54am UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/18 "2021-03-22T03:54:59Z")
I thought they ran to Lineville Road together but as you said not so I deleted that ---
**Author:** ![Author\_Balk](https://avatars.discourse-cdn.com/v4/letter/a/e0b2c6/32.png) [@Author\_Balk](https://boards.straightdope.com/u/Author_Balk)\ **Post date:** [March 24, 2021, 11:28am UTC](https://boards.straightdope.com/t/what-piece-of-us-interstate-highway-has-the-most-different-interstate-designations/938037/19 "2021-03-24T11:28:02Z")
I drove on this section of road a few times. You were going North and South at the same time. This is near Wytheville, Virginia. [![Imgur](https://live.staticflickr.com/7084/6978489456_f6fe351e89_b.jpg "I-77 / I-81 / US 11 / US 52") ](https://www.flickr.com/photos/jmd41280/6978489456)