US and Interstate routes that cross only once with no interchange

[hbelkins]

How many US and Interstate routes are there that have only one crossing with no interchange?

Kentucky has several.

I-24 -- has an interchange with every US route it crosses.

I-64 -- crosses US 31 in Louisville with no interchange, crosses US 421 near Midway with no interchange, is crossed by US 25 in Lexington with no interchange.

I-65 -- crosses US 60 in Louisville with no interchange. (At that location, US 60 is concurrent with US 31E, but there is a signed exit for US 31E on the north side of Nashville so it does not count. Also, I-65 crosses US 150 in Louisville, but there is an exit for Broadway and US 150 runs along Broadway, even though US 150 is not posted on the sign, so it does not count.)

I-165 -- crosses US 62 near Beaver Dam with no interchange. (I-165 is a recent addition to the Interstate system, as it was previously the Green River/William H. Natcher Parkway.)

I-275 -- no interchange with US 27, although "To US 27" is signed on the interstate at the exit for I-471/unsigned KY 471).

I-69, I-264, I-265, and I-471 -- each has an interchange with every route it crosses (although I'm unsure of the status of I-471 and US 52 in Ohio.)

How about your state?

[JayhawkCO]

Not a thing in Colorado.

[Bobby5280]

In Oklahoma I-44 crosses US-177 with no interchange, but there is an I-44 interchange with OK-66 about a mile to the West in Wellston. I think that's the only example in Oklahoma.

[hotdogPi]

This thread is a duplicate of https://www.aaroads.com/forum/index.php?topic=26919.0, which you started yourself

[vdeane]

Technically, I-88 (NY) and US 20.  Exit 24 is with reference route 915Q.

More meaningfully, I-87 and US 20.  Also I-90 and US 11.

[Great Lakes Roads]

I-80/90 at US 35.

[froggie]

This thread is a duplicate of https://www.aaroads.com/forum/index.php?topic=26919.0, which you started yourself

Well, since there are at least two states I'm familiar with that were not mentioned in THAT thread, I'm going to mention them here:

Vermont:  two.  I-91 crosses over US 4 once with no interchange.  I-89 does the same thing with US 5.
New Hampshire:  no examples of a single crossing without an interchange.

[wxfree]

This made me think of the opposite question in Texas, with our love of frontage roads and interchanges.  Is there even one crossing without an interchange?  My first thought was that if there were, it would most likely be in an urban area or on parallel routes.  I found one of each.  US 67 crosses I-30 without an interchange where the two run parallel.  It's near US 271, so getting between the two is easy.  The other one I found is I-110 at US 62 in El Paso.  The Interstate is short, between I-10 and the border.  That's the only crossing, so this one is an answer to the question.

[ElishaGOtis]

While not technically an interstate, it effectively acts as one. CFL GreeneWay SR-417 in Orlando crosses US-192 with no interchange.

[Dough4872]

Lot of examples in Pennsylvania with the Pennsylvania Turnpike having limited interchanges. I-76 crosses US 322 without an interchange, I-276 crosses US 202 without an interchange, and I-476 crosses US 202 and US 222 without interchanges.

[webny99]

From the previous thread:

I-90 and US 20 cross 3 times in New York State alone, and none of those 3 crossings have an interchange. There is a direct interchange between the two, but it's not at one of the crossings.

Obviously, there are plenty of I-90/US 20 interchanges in other states that disqualify it, but it's an interesting one from a purely NY perspective.

I'm actually shocked that no one called me out on my multi-faceted error: First, I accidentally counted US 20 where it crosses the Thruway near Crossgates Mall, but that's I-87, not I-90, and second, I completely forgot about the actual third crossing in Schodack Center, which has an interchange. Maybe everyone else forgot it too since it's overlapped with US 9.

Still, that's only a 33% "interchange rate" for I-90/US 20 in NY, which is pretty low.

[webny99]

Wait a minute... There are actually three I-90/US 20 interchanges in NY too, but only one of those aligns with a crossing.

Three crossings and three interchanges, but two of the crossings don't have interchanges, and two of the interchanges don't have crossings. So of five total interactions between I-90 and US 20 in NY, Schodack Center is the only "normal" one.

[thspfc]

I-90 and US-45 in Rosemont IL

[mgk920]

Ninguna en Wisconsin, tampoco.

Mike

[JayhawkCO]

If I were to guess, I'd posit that there are less than 20 of these west of the Mississippi.

I did find one in Kansas. US75 crosses I-335 without an interchange.

[vdeane]

Wait a minute... There are actually three I-90/US 20 interchanges in NY too, but only one of those aligns with a crossing.

Where?  There's Thruway exit 58 and free 90 exit 11, but I'm not aware of a third.  Are you including Fuller Road Alternate (exit 1S)?  If so, that's really a stretch, given that the end is a stub for the Southside Route and there's an intermediate interchange.

Regardless, now you're doubling down on something that you mentioned doesn't fit the thread criteria.

[webny99]

Wait a minute... There are actually three I-90/US 20 interchanges in NY too, but only one of those aligns with a crossing.

Where?  There's Thruway exit 58 and free 90 exit 11, but I'm not aware of a third.  Are you including Fuller Road Alternate (exit 1S)?  If so, that's really a stretch, given that the end is a stub for the Southside Route and there's an intermediate interchange.

Regardless, now you're doubling down on something that you mentioned doesn't fit the thread criteria.

Yes, the third interchange I was referring to is the Northway stub connecting from I-87/I-90 to US 20. I don't see how it's any different the Thruway Exit 58. If it was numbered as a separate route or became part of I-87 that would be one thing, but right now it's functionally just a pair of ramps and signed as such.

And I know I-90/US 20 doesn't fit the thread because of multiple crossings, but that's pretty arbitrary to begin with, and it is a very interesting and unique case that's worth mentioning in lieu of starting a whole new thread.

[hbelkins]

If I were to guess, I'd posit that there are less than 20 of these west of the Mississippi.

I did find one in Kansas. US75 crosses I-335 without an interchange.

The I-470 interchange is signed "To US 75" so I'm not sure if it counts or not.

[TheStranger]

Not sure there are any California examples at present, if we only count existing US routes (and even if we include historic ones like US 66) -

US 101 fully intersects 5/10, 110 (signed as interstate here at the Four-Level), 405, 680/280, 880, 380, 280 again, 80, and 580

US 50 starts at I-80 and intersects I-5.  (and is also concurrent with unsigned I-305 between 80 and Route 99)

US 395 starts at I-15 and doesn't have any other interstate junctions

US 95 has a concurrency with I-10 and a concurrency with I-40

US 97 starts at I-5

US 199 does not reach an Interstate until its terminus in Oregon

---

Historic examples?

Old US 66 has an interchange with I-405 (existed together for a few years), I-5 (the 110/5 interchange), has direct ramps with I-210 at the Route 19 (unsigned Route 164) junction, direct connection to I-605, direct interchange with I-15 and of course direct one with I-215, etc.

Old 99 ran concurrent in places with I-5 and I-10

Old 399 has interchange with I-5 (the current 119/I-5 junction)

Old 466 was concurrent with I-15 and 91, and also interchanges with I-5 (the current 46/I-5 junction)

Old US 60 has the cloverleaf with I-215 in Riverside

[JayhawkCO]

If I were to guess, I'd posit that there are less than 20 of these west of the Mississippi.

I did find one in Kansas. US75 crosses I-335 without an interchange.

The I-470 interchange is signed "To US 75" so I'm not sure if it counts or not.

I would say since there isn't an interchange that leads directly to US75 (since you have to go on I-470 first), then it would count.

[vdeane]

Yes, the third interchange I was referring to is the Northway stub connecting from I-87/I-90 to US 20. I don't see how it's any different the Thruway Exit 58. If it was numbered as a separate route or became part of I-87 that would be one thing, but right now it's functionally just a pair of ramps and signed as such.

It doesn't feel like a just pair of ramps when you drive on it (note that the "be prepared to stop" signs are for people getting off at the Crossgates interchange).  Northbound even has exit numbers, because the through route in the Northway/Fuller Road Alternate, not I-87.  In fact, most people around here don't acknowledge I-87 off the Northway at all; the Thruway is just the Thruway, and the Deegan isn't known.  It's also reference route 910F, while exit 58 has no such designation and is basically the same as every other Thruway trumpet except for being very long.

Personally, I think it has more in common with the Maine Turnpike Approach Road.

[GenExpwy]

Yes, the third interchange I was referring to is the Northway stub connecting from I-87/I-90 to US 20. I don't see how it's any different the Thruway Exit 58. If it was numbered as a separate route or became part of I-87 that would be one thing, but right now it's functionally just a pair of ramps and signed as such.

It doesn't feel like a just pair of ramps when you drive on it (note that the "be prepared to stop" signs are for people getting off at the Crossgates interchange).  Northbound even has exit numbers, because the through route in the Northway/Fuller Road Alternate, not I-87.  In fact, most people around here don't acknowledge I-87 off the Northway at all; the Thruway is just the Thruway, and the Deegan isn't known.  It's also reference route 910F, while exit 58 has no such designation and is basically the same as every other Thruway trumpet except for being very long.

Personally, I think it has more in common with the Maine Turnpike Approach Road.

In that case we could also count I-84 and US 202 at Brewster.

Also in NY:

I-87 and US 44 near Modena (mentioned in the other thread)
I-90 and US 62 near Blasdell (mentioned in the other thread)
I-87 and US 6 at Harriman
I-87 and US 202 at Suffern
I-690 and US 11 in downtown Syracuse
And for the very obscure, the unsigned bit of I-787 and US 4 in Troy

[ilpt4u]

I-57 and US 40 in Effingham IL
I-88 and US 52 in Dixon IL
I-57 and US 150 in Champaign IL
I-280 and US 67 in Milan IL

[jdb1234]

I-459 passes under US 78 without an interchange.

In Atlanta, I -20 crosses US 19, US 29, and US 41 without an interchange. 

I-75 crosses US 92 in Tampa without an interchange.
I-75 crosses US 319 in Tifton, GA without an interchange.
I-10 used to cross US 319 in Tallahassee without an interchange.   When I-10 was widened an exit from westbound I-10 to US 319 was added.

[jp the roadgeek]

I-90 and US 7 in Stockbridge, MA
I-84 and US 5 in East Hartford, CT (though there is an entrance ramp to I-84 West accessible only from US 5 NB)