Interstate Intersections 1 Digit Off

[ethanhopkin14]

How may interstate intersections are there that are one digit off in the country?

Rules:

1. They can't be the next available number (Example: I-8 doesn't intersect I-9 because there is no I-9 (not yet) so the next number is I-10.  This doesn't work)

2. Excludes interstates that are both east-west or north-south and are the next number in their sequence. (Example: I-8, the next even number is I-10.  This doesn't work)

3. This does include 3dis, hidden and signed.

4. Does include future junctions

I will start with Future I-11 intersecting I-10 somewhere near Buckeye, AZ.

[TheHighwayMan3561]

Future I-69/70
I-70/71
I-80/81
I-90/91

[KEK Inc.]

I-10 and I-20 in western Texas.  Sure it's the tens digit place, but it counts under your rules.


iPhone

[ethanhopkin14]

I-10 and I-20 in western Texas.  Sure it's the tens digit place, but it counts under your rules.


iPhone

Should I have said one numeric integer?

[Big John]

I-76/77 Akron OH

[sprjus4]

I-65 / I-64 in Louisville

[jmacswimmer]

I-79/I-80 north of Pittsburgh.

As for 3di's, I don't think there are any consecutively-numbered ones that intersect, but I-264 & I-265 are within a few miles of each other in the Louisville area.  As an honorable mention, I-270 & I-271 are about 100 miles apart on I-71.

EDIT: I-290 & I-291 (MA) are about 40 miles apart via I-90, and I-290 & I-291 (CT) are about 50 miles apart via I-90 & I-84.

[Scott5114]

I-10 and I-20 in western Texas.  Sure it's the tens digit place, but it counts under your rules.

I-20 and I-30 west of Fort Worth.
I-30 and I-40 in North Little Rock.
I-80 and I-90 near Chicago.

[ethanhopkin14]

How may interstate intersections are there that are one digit off in the country?

Rules:

1. They can't be the next available number (Example: I-8 doesn't intersect I-9 because there is no I-9 (not yet) so the next number is I-10.  This doesn't work)

2. Excludes interstates that are both east-west or north-south and are the next number in their sequence. (Example: I-8, the next even number is I-10.  This doesn't work)

3. This does include 3dis, hidden and signed.

4. Does include future junctions

I will start with Future I-11 intersecting I-10 somewhere near Buckeye, AZ.

I think by reading the rules, you can extrapolate that I was referring to consecutive numbers (rules 1 and 2 are clear that I am talking about consecutive number, not just any digit being a number off).  I-40 and I-30 do not count.   Sorry I didn't explicitly explain that one.

This is the reason I take half a year to a year sabbaticals from this forum.  I want to have a chat about highways with other people who appreciate them as much as I do, and possibly have some fun with them, and some people here want to get bogged down in semantics or just crap on everyone's parades by being trolls.  Not saying everyone is, but a few are. 

[ilpt4u]

I-74 and I-75, Cincy
I-73 and "I-74" , North Carolina
I would says I-65 and Future I-66 in Kentucky, but pretty sure that plan is pretty much dead
Fantasy Fictional: I-40 and Future I-41, west of Nashville, TN

[Scott5114]

How may interstate intersections are there that are one digit off in the country?

Rules:

1. They can't be the next available number (Example: I-8 doesn't intersect I-9 because there is no I-9 (not yet) so the next number is I-10.  This doesn't work)

2. Excludes interstates that are both east-west or north-south and are the next number in their sequence. (Example: I-8, the next even number is I-10.  This doesn't work)

3. This does include 3dis, hidden and signed.

4. Does include future junctions

I will start with Future I-11 intersecting I-10 somewhere near Buckeye, AZ.

I think by reading the rules, you can extrapolate that I was referring to consecutive numbers (rules 1 and 2 are clear that I am talking about consecutive number, not just any digit being a number off).  I-40 and I-30 do not count.   Sorry I didn't explicitly explain that one.

This is the reason I take half a year to a year sabbaticals from this forum.  I want to have a chat about highways with other people who appreciate them as much as I do, and possibly have some fun with them, and some people here want to get bogged down in semantics or just crap on everyone's parades by being trolls.  Not saying everyone is, but a few are. 

Other people like having fun doing things too. I think it's interesting that roads off by 10 intersect at all, considering that a perfect grid would dictate that this never happens.

So do you have a right to say that only your definition of what is 'fun' is what is allowed here?

[ethanhopkin14]

How may interstate intersections are there that are one digit off in the country?

Rules:

1. They can't be the next available number (Example: I-8 doesn't intersect I-9 because there is no I-9 (not yet) so the next number is I-10.  This doesn't work)

2. Excludes interstates that are both east-west or north-south and are the next number in their sequence. (Example: I-8, the next even number is I-10.  This doesn't work)

3. This does include 3dis, hidden and signed.

4. Does include future junctions

I will start with Future I-11 intersecting I-10 somewhere near Buckeye, AZ.

I think by reading the rules, you can extrapolate that I was referring to consecutive numbers (rules 1 and 2 are clear that I am talking about consecutive number, not just any digit being a number off).  I-40 and I-30 do not count.   Sorry I didn't explicitly explain that one.

This is the reason I take half a year to a year sabbaticals from this forum.  I want to have a chat about highways with other people who appreciate them as much as I do, and possibly have some fun with them, and some people here want to get bogged down in semantics or just crap on everyone's parades by being trolls.  Not saying everyone is, but a few are. 

Other people like having fun doing things too. I think it's interesting that roads off by 10 intersect at all, considering that a perfect grid would dictate that this never happens.

So do you have a right to say that only your definition of what is 'fun' is what is allowed here?

Fair enough, you got me.  I really think your point is interesting too.  So, do you consider I-35(E) and I-45 to intersect?  They do not directly intersect, but the Woodall Rogers Freeway has ramps to and from each.

[SGwithADD]

Future I-86/I-87 in New York

I-87 and I-88 miss by just over 5 miles now, but would've connected had the I-88 extension been built.

[GaryV]

I-69 and I-96 are one digit reversed off - does that count?

[Scott5114]

How may interstate intersections are there that are one digit off in the country?

Rules:

1. They can't be the next available number (Example: I-8 doesn't intersect I-9 because there is no I-9 (not yet) so the next number is I-10.  This doesn't work)

2. Excludes interstates that are both east-west or north-south and are the next number in their sequence. (Example: I-8, the next even number is I-10.  This doesn't work)

3. This does include 3dis, hidden and signed.

4. Does include future junctions

I will start with Future I-11 intersecting I-10 somewhere near Buckeye, AZ.

I think by reading the rules, you can extrapolate that I was referring to consecutive numbers (rules 1 and 2 are clear that I am talking about consecutive number, not just any digit being a number off).  I-40 and I-30 do not count.   Sorry I didn't explicitly explain that one.

This is the reason I take half a year to a year sabbaticals from this forum.  I want to have a chat about highways with other people who appreciate them as much as I do, and possibly have some fun with them, and some people here want to get bogged down in semantics or just crap on everyone's parades by being trolls.  Not saying everyone is, but a few are. 

Other people like having fun doing things too. I think it's interesting that roads off by 10 intersect at all, considering that a perfect grid would dictate that this never happens.

So do you have a right to say that only your definition of what is 'fun' is what is allowed here?

Fair enough, you got me.  I really think your point is interesting too.  So, do you consider I-35(E) and I-45 to intersect?  They do not directly intersect, but the Woodall Rogers Freeway has ramps to and from each.

I would say no. For what it's worth, the portion of freeway the Woodall Rogers interchanges with appear to be I-345, not I-45 itself.

[Henry]

I-10 and I-20 in western Texas.  Sure it's the tens digit place, but it counts under your rules.

I-20 and I-30 west of Fort Worth.
I-30 and I-40 in North Little Rock.
I-80 and I-90 near Chicago.

Add I-75 and I-85 in Atlanta, as well as I-85 and I-95 in Petersburg.

[KEK Inc.]

I'm surprised noone stated I-H1 /I-H2. 

have some fun with them

That's sort of the point.  Unfortunately, there's only so many Interstates, and the grid is missing a lot of the lower and mid numbers.  US highways, though!

US-1/US-2 in Houlton, ME
US-2/US-3 in Lancaster, NH
US-2/US-3 in Boscawen, NH
etc...

[jmacswimmer]

I-10 and I-20 in western Texas.  Sure it's the tens digit place, but it counts under your rules.

I-20 and I-30 west of Fort Worth.
I-30 and I-40 in North Little Rock.
I-80 and I-90 near Chicago.

Add I-75 and I-85 in Atlanta, as well as I-85 and I-95 in Petersburg.

And to finish this off, I-5 almost meets I-15 (currently meets CA 15).

[kphoger]

Unless I'm missing something, ALL of the Interstate highways in Alaska and Puerto Rico intersect at least one other Interstate whose number differs by ±1.

[Terry Shea]

I-69 and I-96 are one digit reversed off - does that count?

The Lansing area is a dyslexic, oral sex freaks nightmare!

[KEK Inc.]

Unless I'm missing something, ALL of the Interstate highways in Alaska and Puerto Rico intersect at least one other Interstate whose number differs by ±1.

Much like I-305 in Sacramento, I still have yet to see an I-A1 or I-PR2 sign in the wild. 

[ethanhopkin14]

Unless I'm missing something, ALL of the Interstate highways in Alaska and Puerto Rico intersect at least one other Interstate whose number differs by ±1.

Much like I-305 in Sacramento, I still have yet to see an I-A1 or I-PR2 sign in the wild.

I would love to see Puerto Rico's interstate signed!!!

[kphoger]

Unless I'm missing something, ALL of the Interstate highways in Alaska and Puerto Rico intersect at least one other Interstate whose number differs by ±1.

Much like I-305 in Sacramento, I still have yet to see an I-A1 or I-PR2 sign in the wild. 

Except that I-305 does not intersect another Interstate whose number differs by ±1.

But, that may be beside the point, as the OP specifically said hidden designations do count.  Though, as I look at it more closely, he only actually said hidden 3di count.  So perhaps I-A1, I-A2, I-A3, I-A4, PRI-1, PRI-2, and PRI-3 don't actually count because they aren't 3di.

[Captain Jack]

I'm surprised noone stated I-H1 /I-H2. 

have some fun with them

That's sort of the point.  Unfortunately, there's only so many Interstates, and the grid is missing a lot of the lower and mid numbers.  US highways, though!

US-1/US-2 in Houlton, ME
US-2/US-3 in Lancaster, NH
US-2/US-3 in Boscawen, NH
etc...

If you're doing US routes, might as well throw in the trifecta- US 60/US 61/US 62 in Sikeston, MO. I think that is the on 3-fer.

[jp the roadgeek]

I'm surprised noone stated I-H1 /I-H2. 

have some fun with them

That's sort of the point.  Unfortunately, there's only so many Interstates, and the grid is missing a lot of the lower and mid numbers.  US highways, though!

US-1/US-2 in Houlton, ME
US-2/US-3 in Lancaster, NH
US-2/US-3 in Boscawen, NH
etc...

US 3/US 4 near Concord, NH
US 4/US 5 in White River Jct, VT
US 5/US 6 in East Hartford, CT (though US 6 is buried on I-84)
US 6/US 7 in Danbury, CT (concurrent for 3 miles)

Then there's a little break...till you get to US 19/US 20 in Erie, PA