States with the most Interstate Crossings

[webny99]

I wasn't sure if this has been done before, but it came up in the "Longest state lines with no interstate crossings" thread and I thought we might as well make it its own thread.

1. Which state has the most total interstate crossings to other states?
2. Which single state border (e.g. NY/PA) has the most interstate crossings?

Note that international crossings do not count for this exercise.
And don't forget to include 3di's when counting (although we can award separate winners for just 2dis as well)!

[TheHighwayMan3561]

I'd guess Illinois for 1 (counting all duplexed crossings as independent routes).

IL/MO: I-55, I-57, I-64, I-70, I-72, I-255, I-270
IL/WI: I-39, I-41, I-90, I-94
IL/IN: I-64, I-70, I-80, I-90, I-94
IL/KY: I-24

[webny99]

For New York:

NY/VT: none
NY/MA: I-90 (1)
NY/CT: I-84, I-95 (2)*
NY/RI: none
NY/NJ: I-78, I-278, I-95, I-287 (4)
NY/PA: I-84, I-81, I-86, I-86**, I-99 (future designation in PA), I-86, I-90 (7)

1. NY has 14 total interstate crossings to other states, plus 3 international crossings (I-81, I-87, I-190) that don't count for this.
2. NY/PA is the statewide winner for most crossings with 7. This probably isn't the national winner, but I'm still including it for reference.


* I'm not double-counting I-684 because there are no exits in CT.
** I'm double-counting here because Exit 60 is entirely within PA.

[dfilpus]

I'd guess Illinois for 1 (counting all duplexed crossings as independent routes).

IL/MO: I-55, I-57, I-64, I-70, I-72, I-255, I-270
IL/WI: I-39, I-41, I-90, I-94
IL/IN: I-64, I-70, I-80, I-90, I-94
IL/KY: I-24

IL/IN: I-74
IL/IA: I-74, I-80, I-280

[thspfc]

My guesses are Illinois for #1 and Illinois/Indiana for #2.

Wisconsin borders have five Interstate crossings: 41/94 at IL, 39/90 at IL, 90 at MN, 94 at MN, and 535 at MN.

[Roadgeekteen]

For Massachusetts, the border with the most is the Connecticut border.

[hotdogPi]

For Massachusetts, the border with the most is the Connecticut border.

It's tied with Rhode Island.

[Roadgeekteen]

For Massachusetts, the border with the most is the Connecticut border.

It's tied with Rhode Island.

Right, forgot about I-195.

[NWI_Irish96]

I don't think multiplexed routes should count for more than 1.

Indiana has 15 with at least one more on the way:

IN/IL: I-90, I-80/94, I-74, I-70, I-64
IN/KY: I-64, I-65, I-265, I-275
IN/OH: I-275, I-74, I-70, I-80/90
IN/MI: I-69, I-94

[SkyPesos]

I'll copy paste my response from the other thread for OH, IN, IL, MO:

Has anyone compiled a list of borders with no interstate crossings?

Kentucky has two -- no interstates between here and Missouri, and none between here and Virginia.

The most we have is five with Ohio -- two for 275, a shared crossing for 71 and 75, and 471 -- and they're all concentrated within a relatively few miles.

Ohio
Indiana: 5 (I-275, I-74, I-70, I-80, I-90)
Kentucky: 4 (I-71, I-75, I-471, I-275)
Michigan: 1 (I-75)
Pennsylvania: 3 (I-76, I-80, I-90)
West Virginia: 3 (I-77, I-470, I-70)
Total: 16

Indiana
Illinois: 6 (I-64, I-70, I-74, I-80, I-94, I-90)
Kentucky: 4 (I-64, I-65, I-265, I-275), +1 future (I-69)
Michigan: 2 (I-94, I-69)
Ohio: 5 (I-275, I-74, I-70, I-80, I-90)
Total: 17

Illinois
Indiana: 6 (I-64, I-70, I-74, I-80, I-94, I-90)
Iowa: 3 (I-280, I-74, I-80)
Kentucky: 1 (I-24)
Michigan: 0
Missouri: 7 (I-57, I-255, I-55, I-64, I-70, I-270, I-72)
Wisconsin: 3 (I-39, I-90, I-94)
Total: 20

Missouri
Arkansas: 1 (I-55), +1 future (I-49)
Illinois: 7 (I-57, I-255, I-55, I-64, I-70, I-270, I-72)
Iowa: 2 (I-29, I-35)
Kansas: 5 (I-435, I-35, I-70, I-635, I-435)
Kentucky: 0
Nebraska: 0
Oklahoma: 1 (I-44)
Tennessee: 1 (I-155)
Total: 17

[GaryV]

Michigan has 3:  I-94 and I-69 to IN; I-75 to Ohio.

The other ends of all 3 connect to a bridge that goes to Ontario.

[ilpt4u]

I'll copy paste my response from the other thread for OH, IN, IL, MO:

Has anyone compiled a list of borders with no interstate crossings?

Kentucky has two -- no interstates between here and Missouri, and none between here and Virginia.

The most we have is five with Ohio -- two for 275, a shared crossing for 71 and 75, and 471 -- and they're all concentrated within a relatively few miles.

Ohio
Indiana: 5 (I-275, I-74, I-70, I-80, I-90)
Kentucky: 4 (I-71, I-75, I-471, I-275)
Michigan: 1 (I-75)
Pennsylvania: 3 (I-76, I-80, I-90)
West Virginia: 3 (I-77, I-470, I-70)
Total: 16

Indiana
Illinois: 6 (I-64, I-70, I-74, I-80, I-94, I-90)
Kentucky: 4 (I-64, I-65, I-265, I-275), +1 future (I-69)
Michigan: 2 (I-94, I-69)
Ohio: 5 (I-275, I-74, I-70, I-80, I-90)
Total: 17

Illinois
Indiana: 6 (I-64, I-70, I-74, I-80, I-94, I-90)
Iowa: 3 (I-280, I-74, I-80)
Kentucky: 1 (I-24)
Michigan: 0
Missouri: 7 (I-57, I-255, I-55, I-64, I-70, I-270, I-72)
Wisconsin: 3 (I-39, I-90, I-94)
Total: 20

Missouri
Arkansas: 1 (I-55), +1 future (I-49)
Illinois: 7 (I-57, I-255, I-55, I-64, I-70, I-270, I-72)
Iowa: 2 (I-29, I-35)
Kansas: 5 (I-435, I-35, I-70, I-635, I-435)
Kentucky: 0
Nebraska: 0
Oklahoma: 1 (I-44)
Tennessee: 1 (I-155)
Total: 17

Illinois is debateable for I-41 for a 21st, as I-41 is signed beginning where US 41/Skokie Hwy joins I-94 WB to create I-41

Missouri/Arkansas is actually Future +2: I-49 as mentioned, and I-57, for a Future total of 19

[ilpt4u]

Michigan has 3:  I-94 and I-69 to IN; I-75 to Ohio.

The other ends of all 3 connect to a bridge that goes to Ontario.

One could argue that Ontario 400-series Highways are Interstate-equivalents

[webny99]

I don't think multiplexed routes should count for more than 1.

I should have clarified this in the OP.

Personally, I think they should count once for each route, but feel free to make the case.

[NWI_Irish96]

I don't think multiplexed routes should count for more than 1.

I should have clarified this in the OP.

Personally, I think they should count once for each route, but feel free to make the case.

If you make the crossing once, you are considered to have crossed on both routes. You don't have to be a double crosser to count both routes.

[webny99]

I don't think multiplexed routes should count for more than 1.

I should have clarified this in the OP.

Personally, I think they should count once for each route, but feel free to make the case.

If you make the crossing once, you are considered to have crossed on both routes. You don't have to be a double crosser to count both routes.

Right, so if you cross on I-80/I-90 from Ohio into Indiana, it would count as both I-80 and I-90 (in other words, it would be counted twice). Wouldn't that be the case here as well?

[vdeane]

1. NY has 14 total interstate crossings to other states, plus 2 international crossings (I-81, I-190) that don't count for this.

I was unaware of I-87 being truncated.

[CoreySamson]

Texas has only 8 (possibly 9?) as of now:

TX/LA: I-10, I-20
TX/AR: I-30, (I-49?)
TX/OK: I-35, I-44, I-40
TX/NM: I-40, I-10

I'm not sure whether to count I-49 or not but the point still stands that Texas has very few interstate border crossings compared to its size and population.

[SkyPesos]

I'll start a leaderboard here. Multiplexed routes in a single crossing are separately counted for this. Future crossings, like I-49 AR-MO and I-69 KY-IN, will be noted, but not counted in the final tally. Interstate designations that dead end at a border doesn't count, as it technically didn't cross the border from it not being signed in the other state.

1 - Illinois, Pennsylvania (+1 future) (21)
3 - Indiana (+1 future), Missouri (+2 future) (17)
5 - Ohio (16)
6 - Tennessee (15)
7 - New York (+1 future) (13)
8 - Texas (+3 future) (8)
9 - Wisconsin (7)
10 - Minnesota (8)
11 - Colorado (5)
12 - Nevada (+1 future) (4)
13 - Michigan (3)

[TheHighwayMan3561]

Minnesota has just 6:

ND: I-94
SD: I-90
IA: I-35
WI: I-90, I-94, I-535

[ilpt4u]

Off the top of my head for PA:
PA/OH: I-90, I-80, I-76
PA/NY: I-90, I-86 near its Western terminus, I-99 maybe?, I-86 dips into PA at Waverly/South Waverly- does that count once or twice additionally?, I-81, I-84
PA/WV: I-79, I-70
PA/MD: I-70, I-81, I-83
PA/DE: I-95, I-495 is debateable especially SB
PA/NJ: I-76, I-676, I-95, I-295, I-78, I-80

20 for sure (not counting 99 nor 495; only counting 86 twice). 3 "maybes"

[SkyPesos]

I think Pennsylvania has a chance of overtaking IL for most crossings.

Delaware: 1 (I-95)
Maryland: 3 (I-70, I-81, I-83)
New Jersey: 6 (I-76, I-676, I-95, I-295, I-78, I-80)
New York: 4 (I-90, I-86, I-81, I-84), +1 future (I-99). Not counting the two I-86 crossings at Waverly as the road is maintained by NYSDOT, not PennDOT.
Ohio: 3 (I-76, I-80, I-90)
West Virginia: 2 (I-79, I-70)
Total: 19, 21 if the I-86 Waverly crossings count due to an exit entirely in PA.

not quite enough to overtake IL's 21...

Edit: seems like I got beat out for posting the PA list while I was typing lol.

[Crown Victoria]

I think Pennsylvania has a chance of overtaking IL for most crossings.

Delaware: 1 (I-95)
Maryland: 3 (I-70, I-81, I-83)
New Jersey: 6 (I-76, I-676, I-95, I-295, I-78, I-80)
New York: 4 (I-90, I-86, I-81, I-84), +1 future (I-99). Not counting the two I-86 crossings at Waverly as the road is maintained by NYSDOT, not PennDOT.
Ohio: 3 (I-76, I-80, I-90)
West Virginia: 2 (I-79, I-70)
Total: 19

not quite enough to overtake IL's 21...

Edit: seems like I got beat out for posting the PA list while I was typing lol.

The post for NY counted all of I-86's crossings as there is an interchange entirely in PA at South Waverly. This should count as the roadway is entirely in PA, regardless of which agency maintains it. This would bring PA's total to 21, which will become 22 whenever US 15 finally becomes I-99 between Williamsport and the NY border, and therefore will pass Illinois.

That same post did not count I-684's brief foray into CT as there is no interchange there.

[ilpt4u]

I don't think Tennessee will overtake Illinois, but it should have a decent number, especially if the I-24 dip into Georgia is counted

TN/MO: I-155
TN/AR: I-40, I-55
TN/MS: I-55, I-269, Future I-69
TN/AL: I-65
TN/GA: I-24 either once or twice for its GA dip to meet I-59, I-75
TN/NC: I-40, I-26
TN/VA: I-81
TN/KY: I-75, I-65, I-24, Future I-69

Only 15 presently (counting I-24 into GA twice); bumping up to 17 when I-69 begins being signed in TN

[SkyPesos]

I think Pennsylvania has a chance of overtaking IL for most crossings.

Delaware: 1 (I-95)
Maryland: 3 (I-70, I-81, I-83)
New Jersey: 6 (I-76, I-676, I-95, I-295, I-78, I-80)
New York: 4 (I-90, I-86, I-81, I-84), +1 future (I-99). Not counting the two I-86 crossings at Waverly as the road is maintained by NYSDOT, not PennDOT.
Ohio: 3 (I-76, I-80, I-90)
West Virginia: 2 (I-79, I-70)
Total: 19

not quite enough to overtake IL's 21...

Edit: seems like I got beat out for posting the PA list while I was typing lol.

The post for NY counted all of I-86's crossings as there is an interchange entirely in PA at South Waverly. This should count as the roadway is entirely in PA, regardless of which agency maintains it. This would bring PA's total to 21, which will become 22 whenever US 15 finally becomes I-99 between Williamsport and the NY border, and therefore will pass Illinois.

That same post did not count I-684's brief foray into CT as there is no interchange there.

Ah ok, that makes sense too. For interstates that cross into a state for a short distance, then cross back into the state it came from, I used the DOT that maintained the road in the crossed-over state to count it. So this is what it resulted in:
I-684 NY-CT: Doesn't count as NYSDOT maintains CT segment.
I-86 NY-PA: Doesn't count as NYSDOT maintains PA segment.
I-24 TN-GA: Counts for both crossings as GDOT maintains GA segment.