Consecutive Interstates

[andrewkbrown]

How many instances exist where consecutively numbers interstates intercsect?

I know of I-70/I-71 in Columbus, I-74/I-75 in Cincinnati, and I-76/I-77 in Akron.

3 in Ohio. Any other state with as many, or for that matter, any other state with consecutive pairs of consecutive junctions like 74/75 and 76/77? 

[rickmastfan67]

I-73 and I-74 in NC.

[thenetwork]

Mercer, PA -- I-79 & I-80

Also in PA -- I-80 & I-81

[mightyace]

The network beat me to these:
I-79 and I-80 in Western PA near Mercer

I-80 and I-81 in Eastern PA near Hazleton

Also:
I-74 ends at I-75 in Cincinnati, OH

I-90 and I-91 in Springfield, MA

I-64 and I-65 in Louisville, KY

when I-69 is extended, it and I-70 will intersect around Indianapolis

when completed I-86 will meet I-87 in New York

if Kentucky's pipe dream comes true I-65 and I-66 near Bowling Green

Close but no cigar:
I-87 and I-88 in the Albany, Schenectady, Troy, NY area

[Ian]

Well everyone has gotten all the interstates I was going to say, but two US routes I know of that do it, is when US 1 and US 2 meet and even multiplex in Houlton, Maine.

[Bickendan]

I-8 and 10 in AZ.

[hbelkins]

Well everyone has gotten all the interstates I was going to say, but two US routes I know of that do it, is when US 1 and US 2 meet and even multiplex in Houlton, Maine.

It's fairly common for US routes. Before the four-lane US 60 was built in Sikeston, Mo., three consecutively-numbered routes (60, 61 and 62) met in downtown. Now they meet south of downtown, and there is a combined routing of Business US 60, US 61 and US 61.

US 23, 24 and 25 did this in Toledo, Ohio before the truncation of US 25.

And I-8 and I-10 above ... what about I-9? 

[rickmastfan67]

I-8 and 10 in AZ.

FAIL. lol.

[SSOWorld]

If the Vegas to Phoenix pipe dream is realized, I-10 and I-11 should connect.

[bugo]

Well everyone has gotten all the interstates I was going to say, but two US routes I know of that do it, is when US 1 and US 2 meet and even multiplex in Houlton, Maine.

It's fairly common for US routes. Before the four-lane US 60 was built in Sikeston, Mo., three consecutively-numbered routes (60, 61 and 62) met in downtown. Now they meet south of downtown, and there is a combined routing of Business US 60, US 61 and US 61.

US 23, 24 and 25 did this in Toledo, Ohio before the truncation of US 25.

US 270 and 271 in Wister, OK.  This is probably the highest numbered consecutive US highway duplex in the country.

[Duke87]

Complete list, so far as I can tell...

Current:
A1/A2 (Tok, AK)
PR1/PR2 (San Juan, PR)
PR1/PR2 (Ponce, PR)
H1/H2 (Pearl City, HI)
64/65 (Louisville, KY)
70/71 (Columbus, OH)
73/74 (long multiplex in NC)
74/75 (Cincinnati, OH)
76/77 (multiplex in Akron, OH)
79/80 (near Grove City, PA)
80/81  (near Hazelton, PA)
90/91 (Springfield, MA)

Planned:
69/70 (east of Indianapolis, IN)
86/87 (Harriman, NY)

So, that's 12 existing plus 2 more planned.

[mightyace]

Complete list, so far as I can tell...

Current:
A1/A2 (Tok, AK)
PR1/PR2 (San Juan, PR)
PR1/PR2 (Ponce, PR)

Since these "interstates" are not signed, should they count?

[Chris]

Wow you guys really amaze me with highway trivia. I'm always thinking; what would be the next trivia topic?

[mightyace]

Wow you guys really amaze me with highway trivia. I'm always thinking; what would be the next trivia topic?

Actually, I first thought about this over Christmas as I was headed to meet up with AlpsROADS and dougtone.  I had gone through the two I-80 junctions just a couple of days apart.  But, in part, due to being on vacation, I didn't remember to post this back then.

[rawmustard]

Wow you guys really amaze me with highway trivia. I'm always thinking; what would be the next trivia topic?

Just search the archives of m.t.r. about 10 years back, and I'm sure you'll find some.

[Bickendan]

And I-8 and I-10 above ... what about I-9?

FAIL. lol.

The only reason this works is because I-9 doesn't exist yet, thus making I-8 and I-10 consecutive. (Ok, it's an admitted stretch, because with that logic, you could say I-5 and I-8 in San Diego are consecutive [no I-6 or 7]).

[SSOWorld]

90/94/39, 94/43, 90/94, 90/39 in Wisconsin

FAIL - consecutive mean you can count up or down by 1

[Bickendan]

Yeah -- you can't even use the I-8/10 argument with that one as I-91 and I-93 beg to strongly differ.

[Hot Rod Hootenanny]

Well everyone has gotten all the interstates I was going to say, but two US routes I know of that do it, is when US 1 and US 2 meet and even multiplex in Houlton, Maine.

It's fairly common for US routes. Before the four-lane US 60 was built in Sikeston, Mo., three consecutively-numbered routes (60, 61 and 62) met in downtown. Now they meet south of downtown, and there is a combined routing of Business US 60, US 61 and US 61.

US 23, 24 and 25 did this in Toledo, Ohio before the truncation of US 25.

From MTR threads gone by, prior to Ohio doing away with US 21 & 25, one could consecutively driven US 19 (starting in PA), 20, 21, 22, 23, 24, & 25

[xonhulu]

The only reason this works is because I-9 doesn't exist yet, thus making I-8 and I-10 consecutive. (Ok, it's an admitted stretch, because with that logic, you could say I-5 and I-8 in San Diego are consecutive [no I-6 or 7]).

So what is the biggest difference between the numbers of intersecting interstates where there are no interstates with numbers in between?

[mightyace]

I could be mistaken.

But, if I'm not, a quick look at my list of used and unused 2di points me towards I-30 which meets I-35E and I-35W in Dallas-Fort Worth.

[WNYroadgeek]

The designation hasn't reached that far yet, but I-86 will intersect I-87 eventually.

[xonhulu]

I could be mistaken.

But, if I'm not, a quick look at my list of used and unused 2di points me towards I-30 which meets I-35E and I-35W in Dallas-Fort Worth.

That does look like the greatest possible.

[NWI_Irish96]

Was just thinking about this topic this morning in relation to the current traffic mess in Louisville and the handy dandy search feature helped to not duplicate a thread. 

Has anybody clinched all of these intersections?  How about just the continental US ones?

[Alex]

Was just thinking about this topic this morning in relation to the current traffic mess in Louisville and the handy dandy search feature helped to not duplicate a thread. 

Has anybody clinched all of these intersections?  How about just the continental US ones?

I have been too all them but the unsigned Alaska and Puerto Rico junctions...



Interstate H1 east at Interstate H2



Interstate 65 north at Interstate 64



Interstate 71 south at Interstate 70



U.S. 311 north at the merge of Interstate 74 east with Interstate 73 south



Interstate 75 north at Interstate 74



Interstate 76 west at Interstate 77



Interstate 79 south at Interstate 80



Interstate 80 west at Interstate 81



Interstate 90 west at Interstate 91


Future junctions...



Interstate 465 / Future Interstate 69 south at Interstate 70



Interstate 87 north at Future Interstate 86