Largest Numerical Difference in a Numbered Junction

[paulthemapguy]

Illinois is interesting in that its lowest-numbered state highway intersects its highest-numbered (signed) state highway:  IL-1 and IL-394.  But the difference between I-74 and I-474 is greater.

I-474 crosses IL-8, but there is no intersection.  It's just an overpass.

So the answer in Illinois is I-474 and US24, at a difference of 450.
(I assumed here that only signed routes count.)

[kphoger]

(I assumed here that only signed routes count.)

Hmm, tricky one.  Technically, some FAS routes are signed.  Just not with shields, so you just have to know where to look!

[Scott5114]

Wisconsin has at least one 3-digit lettered route that I've seen (Trempealeau CTH-OOO near Osseo), so CTH-O and CTH-OOO would beat that.

Ooo!

It depends on whether you go strictly in alphabetical order, or put double letters after single letters and triple letters after double letters. If we're going by the latter, then I think the junction of D and VVV in Fond du Lac is the greatest difference.

My opinion would be to treat multiple letters as an overflow of the single letters, in much the same way that a two-digit number is an overflow of single-digit numbers. So let A = 1, B = 2, C = 3 ... Y = 25, Z = 26, AA = 27, AB = 28, AC = 29, and so on. I don't know if Wis does multiple letters that aren't doubles, but Missouri does.

[Big John]

I don't know if Wis does multiple letters that aren't doubles, but Missouri does.

Yes they do allow non-doubles, but 3-digit must be triples.

[roadfro]

Sorry for the bump. Missed this thread previously.

With Nevada I believe the largest is NV 88 and NV 756.

The largest difference for Nevada is actually SR 893 & US 6/US 50 (diff=887), which is just east of the Major's Place junction in eastern Nevada. After that, it's probably SR 822 & US 50 in Dayton (diff=772), then SR 795 & US 95 north of Winnemucca (diff=700).


In the opposite direction tangent of the thread, Nevada probably has a few locations with a single digit difference. The few I could think of off the top of my head is SR 159 & SR 160 between Las Vegas & Pahrump, SR 206 & SR 207 west of Minden/Gardnerville, SR 304 & SR 305 in Battle Mountain, and SR 341 & SR 342 near Virginia City. We also have a "0", if you consider I-215 transitioning to CC-215 as a junction.

[SkyPesos]

Ohio's largest has been mentioned already: OH 872 and OH 7

The largest between 2 interstates is probably I-85 and I-985, at a difference of 900. Ther other 9xx interstates don't intersect their parent (980 connects 580 and 880, and access to 90 from 990 is via 290).

For smallest difference, Ohio doesn't duplicate state routes and US/Interstates, so unless you're counting variants of the same numbered route separately, like OH 4 and OH 4 Bypass, the smallest difference is 1. Considering Ohio clusters state routes, there are way too many to list for the whole state. But here are some differences of 1 in the Cincinnati Metro Area:
I-74 and I-75
KY 8 and KY 9
KY 16 and KY 17
OH 122 and OH 123
OH 126 and US 127
US 127, OH 128 and OH 129
OH 561 and OH 562

Some examples of a difference of 0 from Indiana and Illinois I can think of, since both of those states don't have a no duplication rule
I-64 and IN 64
I-255 and IL 255

[akotchi]

NJ is 439 and 1

440 intersects 1 Truck

Include unsigned designations and NJ 700's interchange with US 40 is larger.

If sticking with numbered junctions, I-676 and U.S. 30 meet just east of the Ben Franklin Bridge.

[hbelkins]

We're talking about exit numbers, so Kentucky's winner is most likely I-71/I-75 at I-275. Exit 185 + Exit 84.

[hbelkins]

We're talking about exit numbers, so Kentucky's winner is most likely I-71/I-75 at I-275. Exit 185 + Exit 84.

Did you mean to post here?

Yeah. Got my threads confused.

[JasonOfORoads]

For Oregon, the largest difference would be where US-30 (and I-84) intersect with US-730, for a difference of 700. If US-30 doesn't count because it's duplexed with I-84, then the next highest difference would be just up the road, where US-730 intersects with OR-37 (a difference of 693).

For the lowest difference, there are a few instances where the smallest difference is 1. These are a bit easier to find after the Oregon Transportation started numbering state routes off of their hidden highway numbers in 2002-04, which were assigned by county in clusters of 10. For example, OR-334 and OR-335 intersect (and even run concurrent) north of Pendleton. For pre-2002 routings, OR-206 and OR-207 intersect and run concurrent between Ruggs and Heppner, OR-213 and OR-214 are concurrent for a block in Silverton, and OR-27's northern terminus is at US-26 in Prineville. Historically, OR-223 and the first iteration of OR-224 used to intersect near Lewisville.

[Bickendan]

For Oregon, the largest difference would be where US-30 (and I-84) intersect with US-730, for a difference of 700. If US-30 doesn't count because it's duplexed with I-84, then the next highest difference would be just up the road, where US-730 intersects with OR-37 (a difference of 693).

For the lowest difference, there are a few instances where the smallest difference is 1. These are a bit easier to find after the Oregon Transportation started numbering state routes off of their hidden highway numbers in 2002-04, which were assigned by county in clusters of 10. For example, OR-334 and OR-335 intersect (and even run concurrent) north of Pendleton. For pre-2002 routings, OR-206 and OR-207 intersect and run concurrent between Ruggs and Heppner, OR-213 and OR-214 are concurrent for a block in Silverton, and OR-27's northern terminus is at US-26 in Prineville. Historically, OR-223 and the first iteration of OR-224 used to intersect near Lewisville.

And I was going to go with the ORH's for the smallest difference, with ORH 1 and 2 at the I-5/84/US 30 interchange.
You did miss 212 and 213 on I-205, and 212/213's former concurrency, though.