What's the shortest distance a highway/interstate spends in a state?

[TravelingBethelite]

Title says it all. I know I-684 spends a couple miles orr less in Connecticut.



This is a notable image, though it might be photoshopped.

[Gulol]

While not the shortest, I-15 is a touch over 29 miles through Arizona.  Beating that would be I-76 in Nebraska which is less than 3 miles.

[noelbotevera]

This subject has been mentioned numerous times

https://www.aaroads.com/forum/index.php?topic=14158.50

Like that thread.

[national highway 1]

US 160 spends just under a mile in New Mexico, by clipping the NW corner of the state.

[The Nature Boy]

The Southern Tier Expressway in New York spends a few miles in Pennsylvania. I think that there's only one exit and New York maintains the highway despite it being in PA.

[MikeTheActuary]

Isn't I-95/I-495 in DC for just a few feet?

[TheHighwayMan3561]

MN 23 clips about half a mile of Wisconsin southwest of Duluth, although there are no signs letting you know you're in Wisconsin and there is no access to any other part of the state from MN 23.

[The Nature Boy]

Isn't I-95/I-495 in DC for just a few feet?

The Woodrow Wilson Bridge clips a SMALL corner of DC. If we allow DC in then it would probably win this thread.

[Jim]

Here's the list based on current TravelMapping data of all US and Interstates that have a segment in a state of a half mile or less:


+------------+--------+--------+--------+--------+------------------------+---------------+-----------+
| systemName | region | route  | banner | abbrev | city                   | root          | mileage   |
+------------+--------+--------+--------+--------+------------------------+---------------+-----------+
| usai       | DC     | I-95   |        |        |                        | dc.i095       | 0.0679346 |
| usai       | DC     | I-495  |        |        |                        | dc.i495       | 0.0679346 |
| usaus      | NY     | US220  |        |        |                        | ny.us220      | 0.0697314 |
| usaus      | ID     | US195  |        |        |                        | id.us195      |  0.144528 |
| usaus      | KY     | US52   |        |        | Goodman, WV            | ky.us052      |  0.182123 |
| usaus      | KY     | US119  |        | Goo    | Goodman, WV            | ky.us119goo   |  0.182123 |
| usai       | PA     | I-86   |        | SWa    | South Waverly, PA      | pa.i086swa    |  0.235524 |
| usaus      | IA     | US77   |        |        |                        | ia.us077      |  0.254329 |
| usai       | IN     | I-164  |        |        |                        | in.i164       |  0.264134 |
| usai       | IA     | I-129  |        |        |                        | ia.i129       |  0.280296 |
| usaus      | PA     | US206  |        |        |                        | pa.us206      |  0.408579 |
| usaus      | TN     | US45   |        | SFu    | South Fulton, TN       | tn.us045sfu   |  0.466482 |
+------------+--------+--------+--------+--------+------------------------+---------------+-----------+

[Zeffy]

The Garden State Parkway technically spends 2 miles in New York before terminating at I-87. I-76 dies in New Jersey only 3 miles after entering it.

[Jim]

If we expand to the entire TravelMapping database (active systems only), we have quite a few under a quarter mile.  However, many of these are just short roads - not roads that spend a short time in one state or region.

+------------+----------+-------------+--------+--------+----------------------------------+---------------------+-----------+
| systemName | region   | route       | banner | abbrev | city                             | root                | mileage   |
+------------+----------+-------------+--------+--------+----------------------------------+---------------------+-----------+
| usany      | NY       | NY120A      |        | Rye    | Rye Lake, NY                     | ny.ny120arye        | 0.0430845 |
| usausb     | KY       | US119       | Spr    | Wil    | Williamson, WV                   | ky.us119sprwil      | 0.0548651 |
| usaor      | OR       | OR204       | Trk    | Elg    | Elgin                            | or.or204trkelg      |  0.062602 |
| usai       | DC       | I-95        |        |        |                                  | dc.i095             | 0.0679346 |
| usai       | DC       | I-495       |        |        |                                  | dc.i495             | 0.0679346 |
| usaus      | NY       | US220       |        |        |                                  | ny.us220            | 0.0697314 |
| gbna       | ENG      | A3007       |        |        |                                  | eng.a3007           | 0.0756764 |
| usamd      | MD       | MD874       |        |        |                                  | md.md874            | 0.0766446 |
| gbna       | ENG      | A3009       |        |        |                                  | eng.a3009           |  0.103872 |
| usaid      | ID       | ID128       | Spr    | Lew    | Lewiston                         | id.id128sprlew      |  0.105328 |
| mexd       | MEX-EMEX | MEX15D      |        | Mac    | Macho de Agua                    | mexemex.mex015dmac  |  0.111776 |
| usausb     | OH       | US36        | Con    | Mil    | Millwood, OH                     | oh.us036conmil      |  0.116305 |
| usari      | RI       | RI114A      |        | SEP    | (South) East Providence          | ri.ri114asep        |  0.118152 |
| gbna       | ENG      | A2204       |        |        |                                  | eng.a2204           |   0.12372 |
| usaok      | OK       | OK77D       |        | Ced    | Cedar Village                    | ok.ok077dced        |  0.123977 |
| usamn      | MN       | MN323       |        |        |                                  | mn.mn323            |  0.136354 |
| usame      | NH       | ME110       |        |        |                                  | nh.me110            |   0.14044 |
| gbna       | WLS      | A488        |        | Bis    | Bishops Castle                   | wls.a488bis         |  0.142217 |
| usaus      | ID       | US195       |        |        |                                  | id.us195            |  0.144528 |
| usausb     | ID       | US195       | Spr    | Lew    | Lewiston, ID                     | id.us195sprlew      |   0.14701 |
| usanv      | NV       | NV822       |        |        |                                  | nv.nv822            |  0.151222 |
| usaib      | CO       | I-70        | BS     | Sil    | Silt, CO                         | co.i070bssil        |  0.161211 |
| mexd       | MEX-HGO  | MEXM40D     |        |        | Calpulalpan                      | mexhgo.mexm040d     |  0.161649 |
| mexd       | MEX-TLAX | MEX140D     |        | Max    | Máximo Serdán                  | mextlax.mex140dmax  |  0.169316 |
| usausb     | LA       | US80        | Trk    | Gib    | Gibsland, LA                     | la.us080trkgib      |  0.170626 |
| usany      | NY       | NY114       |        | Gre    | Greenport, NY                    | ny.ny114gre         |  0.172406 |
| gbna       | ENG      | A3201       |        |        |                                  | eng.a3201           |  0.179983 |
| usaus      | KY       | US52        |        |        | Goodman, WV                      | ky.us052            |  0.182123 |
| usaus      | KY       | US119       |        | Goo    | Goodman, WV                      | ky.us119goo         |  0.182123 |
| usaoh      | OH       | OH365       |        |        |                                  | oh.oh365            |  0.182261 |
| gbna       | ENG      | A3008       |        |        |                                  | eng.a3008           |  0.184505 |
| usaks      | KS       | KS137       |        |        |                                  | ks.ks137            |   0.18456 |
| gbna       | ENG      | A4208       |        |        |                                  | eng.a4208           |  0.185234 |
| gbna       | ENG      | A3604       |        |        |                                  | eng.a3604           |  0.187883 |
| gbna       | ENG      | A4029       |        |        |                                  | eng.a4029           |  0.195986 |
| usawv      | WV       | WV102       |        | Poc    | Pocahontas, VA                   | wv.wv102poc         |  0.199017 |
| usamd      | MD       | MD553       |        |        |                                  | md.md553            |  0.199191 |
| eure       | RUS-MOW  | E101        |        |        |                                  | rusmow.e101         |  0.202384 |
| usamd      | MD       | MD911       |        |        |                                  | md.md911            |  0.207088 |
| usausb     | SC       | US701       | Bus    | Tab    | Tabor City, NC                   | sc.us701bustab      |  0.211016 |
| espa       | ESP      | PA32        |        |        |                                  | esp.pa032           |  0.212652 |
| usamd      | MD       | MD896       |        |        |                                  | md.md896            |  0.212674 |
| mexd       | MEX-PUE  | MEX117D     |        |        |                                  | mexpue.mex117d      |  0.216765 |
| gbnam      | ENG      | A74M        |        |        |                                  | eng.a074m           |  0.219303 |
| usaks      | KS       | KS247       |        |        |                                  | ks.ks247            |  0.224866 |
| usact      | CT       | CT78        |        |        |                                  | ct.ct078            |  0.226275 |
| usai       | PA       | I-86        |        | SWa    | South Waverly, PA                | pa.i086swa          |  0.235524 |
| eure       | RUS-LEN  | E20         |        | Kra    | Krasnoye Selo                    | ruslen.e20kra       |   0.23646 |
| usamd      | MD       | MD674       |        |        |                                  | md.md674            |   0.23839 |
| usausb     | AR       | US67        | Bus    | Dat    | Datto, AR                        | ar.us067busdat      |  0.240638 |
| usanc      | NC       | NC306       |        | Bay    | Bayview                          | nc.nc306bay         |  0.241263 |
| usamd      | MD       | MD368       |        |        |                                  | md.md368            |  0.241798 |
| usamd      | MD       | MD284       |        |        |                                  | md.md284            |  0.245181 |
| gbna       | ENG      | A4156       |        |        |                                  | eng.a4156           |  0.248643 |
+------------+----------+-------------+--------+--------+----------------------------------+---------------------+-----------+

[national highway 1]

I-24 dips into Georgia for 4 miles, junctioning I-59 on its way

[ModernDayWarrior]

Interstate 72 runs for just over two miles in Missouri.

[Rothman]

Although MA 102 doesn't technically enter NY, it might as well have:

https://goo.gl/maps/L6A6N

[froggie]

Isn't I-95/I-495 in DC for just a few feet?

Anywhere from 400-600ft, depending on whether you're on the outside lane of the Outer Loop, on the bike/ped path, or somewhere in between.

The Woodrow Wilson Bridge clips a SMALL corner of DC. If we allow DC in then it would probably win this thread.

For Interstate routes, yes.  For state highways, I believe the past winner from past threads was VT 26 at a whopping 53 feet.

[The High Plains Traveler]

U.S. 56-64-412 (a NE-SW trending route) has the northwest corner of Texas in its centerline, so only the northeast-bound lane enters Texas. A vehicle traveling in the middle of that lane would be in Texas for, what, 20 feet? It's obviously not considered a Texas route. New Mexico probably didn't even have to get an agreement with Texas for maintenance.

[JCinSummerfield]

US-8 in Michigan for 2.322 miles.

[empirestate]

| usai       | PA     | I-86   |        | SWa    | South Waverly, PA      | pa.i086swa    |  0.235524 |

What are the supposed limits of I-86 in PA? As far as I know, no extension has yet been enacted that would put I-86 into the South Waverly dip.

The Garden State Parkway technically spends 2 miles in New York before terminating at I-87.

How so? At the state line, the GSP becomes a segment of the NYS Thruway called the Garden State Parkway Connection. What's the technicality that makes this part of the GSP proper?

[Jim]

| usai       | PA     | I-86   |        | SWa    | South Waverly, PA      | pa.i086swa    |  0.235524 |

What are the supposed limits of I-86 in PA? As far as I know, no extension has yet been enacted that would put I-86 into the South Waverly dip.

If what we have in Travel Mapping isn't accurate for the current extent of I-86, I'll gladly add it to the queue of things needing fixing.  I honestly don't remember why or when we last updated I-86 vs. Future I-86 designations in the then-CHM data.

[TheCatalyst31]

If we count connected state highways with the same number, the Maryland portion of PA-MD-DE 896 is right at their tripoint and is only about .2 miles long.

[vdeane]

The update of I-86 in CHM was after the Elmira/Chemung at-grade removal project finished and the FHWA allowed NY to sign I-86 throughout the rest of Region 6.

[empirestate]

| usai       | PA     | I-86   |        | SWa    | South Waverly, PA      | pa.i086swa    |  0.235524 |

What are the supposed limits of I-86 in PA? As far as I know, no extension has yet been enacted that would put I-86 into the South Waverly dip.

If what we have in Travel Mapping isn't accurate for the current extent of I-86, I'll gladly add it to the queue of things needing fixing.  I honestly don't remember why or when we last updated I-86 vs. Future I-86 designations in the then-CHM data.

Well, it might be accurate and I just haven't found out about it yet. I check once in a while, but not exhaustively, so if an extension has been made official I'd be happy to learn about it.

The update of I-86 in CHM was after the Elmira/Chemung at-grade removal project finished and the FHWA allowed NY to sign I-86 throughout the rest of Region 6.

Right, that's sort of how I recall my last inquiry on the subject ending: they got the go-ahead to extend the route, and there's nothing really in the way of doing so, but they just haven't done it yet. Does FHWA's permission amount to an official extension on its own, or does NYSDOT have to take some further step (even if it's just actually putting up signs)?

[mgk920]

The Garden State Parkway technically spends 2 miles in New York before terminating at I-87. I-76 dies in New Jersey only 3 miles after entering it.

I-76 does in much less distance after it enters Nebraska, too.

Mike

[english si]

Looking at a few of these I know about off the top of my head
| systemName | region   | route       | banner | abbrev | city                             | root                | mileage   |
+------------+----------+-------------+--------+--------+----------------------------------+---------------------+-----------+
| gbna       | ENG      | A3007       |        |        |                                  | eng.a3007           | 0.0756764 | Short route
| gbna       | ENG      | A3009       |        |        |                                  | eng.a3009           |  0.103872 | Short route
| gbna       | ENG      | A2204       |        |        |                                  | eng.a2204           |   0.12372 | Short route
| gbna       | WLS      | A488        |        | Bis    | Bishops Castle                   | wls.a488bis         |  0.142217 | tiny dip into Wales (or rather, the border has a bump that eats it). Spends more time in the country later.
| gbna       | ENG      | A3201       |        |        |                                  | eng.a3201           |  0.179983 | Short route
| gbna       | ENG      | A3008       |        |        |                                  | eng.a3008           |  0.184505 | Short route
| gbna       | ENG      | A4208       |        |        |                                  | eng.a4208           |  0.185234 | Short route
| gbna       | ENG      | A3604       |        |        |                                  | eng.a3604           |  0.187883 | Short route
| gbna       | ENG      | A4029       |        |        |                                  | eng.a4029           |  0.195986 | Short route
| eure       | RUS-MOW  | E101        |        |        |                                  | rusmow.e101         |  0.202384 | Part of an interchange strays across a boundary
| gbnam      | ENG      | A74M        |        |        |                                  | eng.a074m           |  0.219303 | Genuine route entering for a tiny bit, though the full length is going to be twice this to account for slip roads to merge in.
| eure       | RUS-LEN  | E20         |        | Kra    | Krasnoye Selo                    | ruslen.e20kra       |   0.23646 | Part of an interchange strays across a boundary
| gbna       | ENG      | A4156       |        |        |                                  | eng.a4156           |  0.248643 | Short route

I deliberately ignored the N1's straying into Northern Ireland when making Irish files for CHM/Travel Mapping. That is a triangle across the road - westernmost lane of 4 gets about 140ft, easternmost lane gets about 3ft, if that.

[peterj920]

In Osceola, WI, Wis 243 only travels 0.3 miles from Wis 35 to the St. Croix River Bridge that crosses into Minnesota.  It turns into MN 243 and only travels a mile after that.