Interstates that turn into a differently numbered state route

[PHLBOS]

Doesn't I-70 technically turn into MD 122 in Baltimore, even though it ends at (as we all know) a parking lot?

No, it rather terminates at MD 122.  The OP is asking for highway corridors bearing an Interstate number that continue as a numbered state route.  I-70 & MD 122 don't share the same corridor right-of-way.

We can probably say that NJ Turnpike I-95 becomes NJ Turnpike NJ 700, if you want to pay attention to a route number that's not posted along with saying that I-95 just starts/stops at Interchange 6.

I believe (and the OP can correct me if I'm wrong) the OP's only interested in an actual Interstate terminus where the highway corridor itself continues with a signed route number.

Assuming that's the OP's criteria; then your I-95/NJ Turnpike example would not count because I-95 continues (it will be signed such once the Middletown, PA interchange is completed) and the fact that teh NJ turnpike south of Exit 6 has no public route number.

[hotdogPi]

Would Quebec 133 be considered a state route? It's an extension of I-89.

[bugo]

I-540 turns into OK 9 at the Arkansas/Oklahoma line near Fort Smith (duplexed with US 271).  Does this happen anywhere else?  Examples like I-440/AR 440 do not count because they have the same number.

540 ends at 271/253

Nope.



There is an "exception" (overlap) between US 271 and I-540.

[Brandon]

This one is a technical no, but I didn't know this until read up on it.  Hell it might as well be...tried my best to think of one in Michigan.

I-375 ends in downtown Detroit on Jefferson Blvd.  Most maps show it continuing as the beginning of M-10 but in actuality there is a less than .20 mile gap on Jefferson that is the unsigned BL I-375.  Strange technicality...why wouldn't M-10 just terminate at I-375?  Suppose it doesn't matter because I'm to understand I-375 is going to be reduced to a parkway in the near future....that is if the city can pay for it. 

I believe it is so that both end at the Tunnel, M-10 and BL-375/I-375.  As for paying for it, that will be MDOT, not the city.

[froggie]

Doesn't I-70 technically turn into MD 122 in Baltimore, even though it ends at (as we all know) a parking lot?

No, because ramps.  Nevermind that SHA now has FHWA interim approval to terminate I-70 at I-695.

[agentsteel53]

what's the status of I-580's south end in Carson City?  is that little connector that's signed as "395" actually US-395?  or is it a temporary designation over some hidden state route?

[admtrap]

I-210 used to turn into CA-57, but that situation no longer exists with the CA-210 extension.

I-110 terminates at Gaffey Ave (the sign at the end of the route falsely suggests that the arterial takes over the I-110 designation, probably a remnant of when the road did continue as CA-11) - it almost counts as the other exit at the end of the route is for CA-47, but that's not the mainline at that point.


The only two that currently exist in the greater LA area both meet the state highway mid-route (The Interstate terminates, but the state route goes in two directions), so I'm not sure it meets the criteria.

I-710 ends in a tangle of roads, but the "main" one terminates at CA-47.

I-10 defaults to CA-1 northbound at its western terminus.



Here's a fun one from Las Vegas;  I-215 defaults to NV-564 in Henderson at its eastern end, and defaults to Clark County route 215 at its western end.  Only case I can think of offhand of an Interstate changing to a county highway.

I-515 defaults to US 95 at both ends, and US 93 at its south end only. 

[TheStranger]

I-110 terminates at Gaffey Ave (the sign at the end of the route falsely suggests that the arterial takes over the I-110 designation, probably a remnant of when the road did continue as CA-11)

To clarify: Gaffey was State Route 110 from 1981 to a few years ago, along the old Route 11 south of the Harbor Freeway.  (this may explain the anachronistic, Port of Los Angeles-installed signage directing drivers to state Route 110 nearby)

[agentsteel53]

Only case I can think of offhand of an Interstate changing to a county highway.

I-229 in Sioux Falls, SD turns into an ostensibly county-maintained road: 476th street.  of course, most of the traffic goes one direction or another on I-90.

[agentsteel53]

I've never seen anything that said that Fairview had a hidden NV Route designation. 

I don't know how Nevada does temporary routes.  I'd bet a lot of states would give it an internal reference designation just to be able to refer to it as something for funding, construction, etc purposes.

[theline]

Though IL-394 is labeled as "Exit 74A" from I-94 East (actually headed south) near Chicago, it is the straight-ahead movement for motorists who wish to continue to the south. I'd submit that it fits the criteria.

[TEG24601]

Washington has a few -


I-405 continues to the North as SR-525, and at the South as SR-518.
I-90 continues West/North as SR-519
I-705 continues Southward as SR-7

[Eth]

Georgia's I-575 becomes GA 5

GA 5 is concurrent with all of I-575, much like the given examples of I-985/GA 365 and I-4/FL 400. You can also throw I-516/GA 21 in that category.

I-575 also has another one, though: GA 515. And unlike GA 5, it actually shares a terminus with I-575, which I think fits a little better here.

I-520 becomes GA 232 at its west end.

[DandyDan]

Only case I can think of offhand of an Interstate changing to a county highway.

I-229 in Sioux Falls, SD turns into an ostensibly county-maintained road: 476th street.  of course, most of the traffic goes one direction or another on I-90.

If you are going east on I-680 in Iowa, when you get to I-29, while I-680 goes north with I-29, the road continues on as a county road towards Crescent, which used to be unsigned Iowa 988.

[jp the roadgeek]

I-110 in MS turns into MS 15 north of I-10

[PenguinXL2]

I-180 ends at I-80 , but continues as PA 147 south.

[Roadsguy]

I-376 turns into PA 360 at its northern end near Sharon. Also, I-478 sort of becomes NY 9A, but the routes end at each other at an angle in a T intersection.

[roadman65]

I-195 in MD becomes MD 166.

[adventurernumber1]

In north Georgia I-575 turns into GA SR 5/GA SR 515 when it terminates.

[jeffandnicole]

We can probably say that NJ Turnpike I-95 becomes NJ Turnpike NJ 700, if you want to pay attention to a route number that's not posted along with saying that I-95 just starts/stops at Interchange 6.

I believe (and the OP can correct me if I'm wrong) the OP's only interested in an actual Interstate terminus where the highway corridor itself continues with a signed route number.

Assuming that's the OP's criteria; then your I-95/NJ Turnpike example would not count because I-95 continues (it will be signed such once the Middletown, PA interchange is completed) and the fact that teh NJ turnpike south of Exit 6 has no public route number.

Technically, the OP never said *signed* route number.  He just said differently numbered state route.

Now, the SLDs that NJDOT produces says that the NJ Turnpike continues along the Penn-Turnpike Extension.  Some others would think that it just stops at Interchange 6, which was my thinking when I put it out above.  And while there's a break in the action, and while it will eventually become whole when the PA Turnpike/95 junction is complete in the year 2743, for now the NJ Turnpike basically does become a differently numbered state route at Int. 6.

[PHLBOS]

We can probably say that NJ Turnpike I-95 becomes NJ Turnpike NJ 700, if you want to pay attention to a route number that's not posted along with saying that I-95 just starts/stops at Interchange 6.

I believe (and the OP can correct me if I'm wrong) the OP's only interested in an actual Interstate terminus where the highway corridor itself continues with a signed route number.

Assuming that's the OP's criteria; then your I-95/NJ Turnpike example would not count because I-95 continues (it will be signed such once the Middletown, PA interchange is completed) and the fact that the NJ turnpike south of Exit 6 has no public route number.

Technically, the OP never said *signed* route number.  He just said differently numbered state route.

Now, the SLDs that NJDOT produces says that the NJ Turnpike continues along the Penn-Turnpike Extension.  Some others would think that it just stops at Interchange 6, which was my thinking when I put it out above.  And while there's a break in the action, and while it will eventually become whole when the PA Turnpike/95 junction is complete in the year 2743, for now the NJ Turnpike basically does become a differently numbered state route at Int. 6.

Truth be told, nobody outside of NJDOT/NJTA personnel, consulting engineers that worked on segments of it, and roadgeeks know that the NJTP south of Exit 6 (at one time, Exit 7A and earlier, Exit 10) has a route number (NJ 700).

Additionally, while there is currently a gap in I-95 in this region as most on this board know; it's not a terminus (where the Interstate number ends for good, the separate I-76, 84 & 86 legs notwithstanding) per the previously-listed examples.

The I-95/NJTP/Exit 6 example still doesn't technically count because I-95 indeed still continues; it's just not presently signed in that manner. 

Currently, there are supplemental (but temporary) I-95 trailblazer signs directing northbound I-95 traffic to use I-295 South then I-195 East to get to the NJTP (at Exit 7A).  However, for some reason, neither NJTA nor NJDOT chose to place supplemental (but temporary) southbound I-95 trailblazers directing those along the NJTP to use Exit 7A (I-195 West).  Had such been done, it would've given hint to those unfamiliar w/I-95 that the highway does continue in the southbound direction but not in the mainline N-S NJTP corridor.

[bulldog1979]

For Michigan, we have a few possibilities.

In Norton Shores, the freeway continues westward from the end of I-96 as BUS US 31.

On either end of I-194 in Battle Creek, the highway continues as M-66, the overlapping partner of the Penetrator.

Depending on how you look at it, I-275 terminates yet its original corridor continues as part of the M-5 freeway.

The freeway continues from the southern end of I-296 in Grand Rapids as US 131. (The northern end of I-296 technically departs US 131 and runs solo to I-96.)

South of Lansing, I-496 ends, and the freeway continues as US 127.

[jas]

For NJ, I believe I-195 becomes NJ29 at it's western terminus and NJ 138 at it's eastern terminus.  And, I-287 becomes NJ 440 at it's southern terminus.

[TheOneKEA]

In Annapolis, MD, the semi-directional interchange between I-97 and US 50/US 301/I-595 includes ramps that link directly to MD 665, and both movements in both directions are roughly equal in terms of curvature, so this might qualify as an honorable mention.

In Reisterstown, MD, there is a similar honorable mention where I-795 splits into two separate sets of carriage ways. One set merges into MD 140 (which doesn't start there) and another set merges into a four-lane arterial road that is unsigned MD 795 (which does start there); MD 795 eventually ends at another four-way intersection with MD 30 and MD 128.

[roadfro]

what's the status of I-580's south end in Carson City?  is that little connector that's signed as "395" actually US-395?  or is it a temporary designation over some hidden state route?

I thought it was both US 50 T and US 395 T?  The only documentation I've seen just says that Fairview is the temporary route and Carson Street is the US 395 BL.  I've never seen anything that said that Fairview had a hidden NV Route designation. 

I don't know how Nevada does temporary routes.  I'd bet a lot of states would give it an internal reference designation just to be able to refer to it as something for funding, construction, etc purposes.

To be honest not 100% on it either but I would be surprised if it just wasn't T route <...> It would be interesting to find for Nevada.

The situation is a bit tricky...

I-580 currently ends at the northern junction of US 395 & US 50 (at William Street) in Carson City. At this same point, US 395 & US 50 begin their overlap on the Carson City Freeway alignment south to Fairview Drive.

Fairview Drive, between the freeway and westward to Carson Street, is currently signed as the US 50/US 395 mainline. Fairview Drive is not currently a state-maintained highway, nor has it ever been (making this the only current mainline US route segment in Nevada not maintained by NDOT). Carson City, not NDOT, paid to widen the street to handle the influx of traffic for the interim configuration.

S. Carson Street, from Fairview Drive south to the southern junction of US 50/US 395, is also signed as the mainline. This is the original routing through town (which has been designated as unsigned SR 529 since 1994).


Since 2009, AASHTO recognizes the new freeway section as mainline US 50/395, while the Fairview Drive and S. Carson Street sections are considered the temporary routes. This means there is a gap in the mainline between the south junction and the freeway. (US 50/395 Business start on Carson St where the temp routes turn–US 50 Bus, while AASHTO approved, remains unsigned.)

Side note: When the freeway first opened down to Fairview, several shield assemblies in both directions signed Fairview Drive as "TO US 50/395", but the "TO" banners were removed within a year to show the street as the mainline. No "TEMP" banners have ever been in the field for this routing.


In the eyes of NDOT, US 50/395 officially run along the as-yet unconstructed final segment of the Carson City Freeway, and has been cataloged this way since designation of SR 529 (and former SR 530) in 1994.


Confused yet ???