Largest Numerical Difference in a Numbered Junction

[Scott5114]

Highest in Oklahoma would be the concurrency between US-412 and SH-3, difference of 409.

With just state highways would have to be 351 (Muskogee Turnpike) and 16, difference of 335.

[webny99]

I-990 is a good candidate for this, but unfortunately the lowest route number it crosses is 263. So that's a difference of 727.

NY 5/NY 635 in Syracuse gets 630, while NY 31/NY 531 is an even 500.

[Jim]

I-990 is a good candidate for this, but unfortunately the lowest route number it crosses is 263. So that's a difference of 727.

NY 5/NY 635 in Syracuse gets 630, while NY 31/NY 531 is an even 500.

New York 890/New York 5 in Glenville.  If we count signed New York 990V, it ends at New York 30 and beats that.

[jmacswimmer]

I believe Maryland's is 894 - between I-895 and US 1.

[Dirt Roads]

In North Carolina, NC-903 wiggles around in a weird multiplex with US-158 to create an intersection with the infamous NC-4 at Littleton.  It keeps on zig-zagging north of Lake Gaston to match up with secondary SR-903 on the Virginia side.

A close second might be NC-906 at its ending at US-17 Bolivia Bypass.  This is a fairly new route connecting to the Swains Cut/Middleton Bridge (a second crossing onto Oak Island, which was constructed in 2010).  Also, NC-904 got extended to US-17 and Seaside Beach back in the late 1950s.

[cjk374]

In Louisiana, it should be in Larose, La: LA 3235 & LA 1.

[Avalanchez71]

In TN it would be technically SR 1 and I-840.  However, SR 1 is posted only on the mile marker signs as it is US 41 & US 70S at the junction with I 840. 

[dlsterner]

I believe Maryland's is 894 - between I-895 and US 1.

In Bel Air, US 1 intersects at an interchange with MD 924 for a difference of 923.  At the same interchange, MD 924 also meets MD 24 for a difference of 900.

[kurumi]

Connecticut appears to be CT 2 and SR 910 (unsigned) for 908.
Signed: US 5 and I-691 for 686.

[DandyDan]

Iowa's is 409 for both signed highways, as IA 415 and US 6 meet in Des Moines. However, the unsigned IA 965 also meets US 6 in Coralville, and that difference is 959.

[ftballfan]

In North Carolina, NC-903 wiggles around in a weird multiplex with US-158 to create an intersection with the infamous NC-4 at Littleton.  It keeps on zig-zagging north of Lake Gaston to match up with secondary SR-903 on the Virginia side.

A close second might be NC-906 at its ending at US-17 Bolivia Bypass.  This is a fairly new route connecting to the Swains Cut/Middleton Bridge (a second crossing onto Oak Island, which was constructed in 2010).  Also, NC-904 got extended to US-17 and Seaside Beach back in the late 1950s.

Off-topic, but NC-903 might be one of the weirdest state highway routes in the country

[jemacedo9]

In PA - US 11 and PA 997.

in DE - DE 4 and DE 896.

[bassoon1986]

Louisiana's got 3278

LA 1 at LA 3279 south of Cloutierville.


iPhone

[DJDBVT]

For Vermont:

Signed: US 7 and VT 346
Unsigned: VT 11/30 and VT 9900 (Tollgate Rd./Winhall State Highway)

[index]

Using NC's secondary routes would basically be cheating since that's such a cheap way to get a big difference, numbers can repeat, and there's so many of them it would be tough to find the biggest difference. Someone already did NC though, so, for SC it's probably 908: JCT of SC 917 and SC 9 BUS.

[michravera]

My bet is US 1 to SR 9336 in Florida City, FL.  Anyone know of such a large difference from the sum of 9336 - 1?

My guess is that the record will happen in a Salt Lake City suburb where street numbers are roughly the distance to the origin in meters.

They only miss by a couple of meters and do not intersect, but it's going to be tough to be US-101 and Infinite Loop.

Elsewhere, it was correctly pointed out that the record for California appears to be 980-24. My hunch is that the record for interstates in California will be a tie between 805-5 and 880-80. I-980 and I-80 just miss. Florida and Washington state have potential for greater Interstate differences, but I don't think they are actually realized.

On the opposite end of the spectrum in California, US-50 and CASR-51 definitely have an interchange and I think CASR-1 and CASR-2 meet also. I think that I-10 and CASR-11 also intersect. Of course, in Sacramento, many numbered Streets intersect the same numbered Avenues (especially in the 40s).

[formulanone]

For Alabama: 700, with I-759 at I-59. If AL 959 ever sees the light of day, that will overtake it.

The lowest posted difference would be 1, at I-20 at AL 21 in Oxford, AL 77 and US 78 in Ohatchee, AL 21 and AL 22 in Rockford, AL 17 and AL 18 in Vernon, US 80 and AL 81 in Tuskegee...and I'm quite sure there's a few others which are just one number apart.

[GaryA]

On the opposite end of the spectrum in California, US-50 and CASR-51 definitely have an interchange and I think CASR-1 and CASR-2 meet also. I think that I-10 and CASR-11 also intersect. Of course, in Sacramento, many numbered Streets intersect the same numbered Avenues (especially in the 40s).

CA-1 and CA-2 used to meet, but both have been relinquished within the City of Santa Monica.

I-10 and former CA-11 (now CA/I-110) do meet, but I-10 and current CA-11 are nowhere near each other.

Also, CA-4 and I-5 meet.

[formulanone]

On the opposite end of the spectrum in California, US-50 and CASR-51 definitely have an interchange and I think CASR-1 and CASR-2 meet also. I think that I-10 and CASR-11 also intersect. Of course, in Sacramento, many numbered Streets intersect the same numbered Avenues (especially in the 40s).

CA-1 and CA-2 used to meet, but both have been relinquished within the City of Santa Monica.

I-10 and former CA-11 (now CA/I-110) do meet, but I-10 and current CA-11 are nowhere near each other.

Also, CA-4 and I-5 meet.

CA 78 and CA 79 meet (and overlap) in and throughout Julian.

[STLmapboy]

Missouri's biggest difference appears to be 731 (MO-13 and MO-744 in Springfield). https://www.google.com/maps/@37.2399262,-93.3143102,1991m/data=!3m1!1e3

[TheHighwayMan3561]

Minnesota has a lot of examples.
MN 13 and US 14
US 14 and MN 15
(historic) MN 15 and US 16
MN 19 and MN 20
MN 22 and 23
MN 27 and 28
MN 28 and 29
I-35W and MN 36
MN 43 and 44
MN 54 and 55
(historic) MN 55 and 56
MN 60 and US 61
MN 67 and 68
I-94 and MN 95
MN 95 and 96
MN 298 and 299

[US 89]

My guess is that the record will happen in a Salt Lake City suburb where street numbers are roughly the distance to the origin in meters.

I mean, those are street names and not route numbers. Not sure where you're getting the distance in meters thing...as an example, 1300 South is about 3.08 km (3080 m) south of the grid axis on South Temple.

But at any rate, if you want to count those you're not going to get any differences bigger than 14000 or so in the Salt Lake area. Your best bet is going to be in a rural county far from wherever the origin point is. The western part of Duchesne County in particular is a great place to look for this type of thing: among others, they have an intersection between 47000 West and 6000 South for a difference of 41000.

[FrCorySticha]

On the opposite end of the spectrum in California, US-50 and CASR-51 definitely have an interchange and I think CASR-1 and CASR-2 meet also. I think that I-10 and CASR-11 also intersect. Of course, in Sacramento, many numbered Streets intersect the same numbered Avenues (especially in the 40s).

Montana has that beat with US 287 and MT 287 meeting in Ennis.

[CNGL-Leudimin]

How about I-41 and US 41 in Wisconsin?

The first junction that came to mind when I first saw this thread was that of A-2 and LP-9221 near Lleida, Spain. At the opposite end there has been junctions between same-numbered routes ever since the first route numbers appeared in 1939, e.g. N-240 and C-240 (now C-14) in Montblanc. A current example is the N-629/CL-629 concurrency in northern Province of Burgos.

[thspfc]

Wisconsin's record is WI-24 and I-894.