Interstates with "X" Exit in Every State

[ethanhopkin14]

So excluding intrastate interstates, are there any interstate highways that have an exit x in every state it goes through?  For example does Interstate XY have an Exit 3 in State A, State B and State C?  I will also except 3di's that cross state lines and have resetting mileposts/exits as a result.

[Scott5114]

I-44 has an Exit 1 in every state it passes through.

You may want to exclude the Northeastern states that are still using sequential numbering.

[ethanhopkin14]

I-44 has an Exit 1 in every state it passes through.

You may want to exclude the Northeastern states that are still using sequential numbering.

Maybe, but at the same time, sequential states can have exits removed, breaking the sequence. 

[Gnutella]

To twist the topic a bit, doesn't every Interstate in Mississippi that's long enough have an Exit 96?

[SkyPesos]

Closest I can find is that I-75 has an exit 2 in every state it passes through except KY, which is 5/6 states. The lowest number on I-75 in KY is 11. It also has an exit 11 in 5/6 states, except OH (can someone at ODOT renumber exit 10B NB and exit 10 SB to 11 for the sake of my sanity; the Galbraith Road overpass is between the 11.0 and 11.1 mile markers).

[Great Lakes Roads]

I-74's exit 4- available in every state except for Ohio (and not counting North Carolina since that's a whole other section of I-74)

[zzcarp]

The western I-76 has its lone Nebraska exit signed as 102. There's also an exit 102 in Colorado northeast of Brush.

[US 89]

As you might expect, this is quite hard to pull off in the west. The western I-84 travels through only three states, but going by Wikipedia's exit lists, the only number that appears in all three is 17. There are 29 other numbers that appear in two states - 19 in Idaho/Oregon, 7 in Utah/Oregon, and 3 in Utah/Idaho.

Although I don't feel like going through every exit on I-15, it is clear that no exit number appears on it in every state it travels through. The closest it gets is 4/6 states, which happens with three numbers: 27 (CA, NV, AZ, UT), 31 (CA, NV, UT, ID), and 93 (CA, NV, ID, MT).

[sparker]

I-5 has an Exit #162 in all three states it traverses; CA and OR are major junctions (CA=CA 14; OR=OR 38/99), while WA's is an in-town Seattle interchange with a surface street.

[CtrlAltDel]

Although I don't feel like going through every exit on I-15, it is clear that no exit number appears on it in every state it travels through. The closest it gets is 4/6 states, which happens with three numbers: 27 (CA, NV, AZ, UT), 31 (CA, NV, UT, ID), and 93 (CA, NV, ID, MT).

I-15 is complicated, of course, because of the low mileage of the route in AZ and NV.

For I-25, there are 4 exits that exist in all three states: 100, 150, 156, and 223, although in CO, there are suffixes to exit 100.
For I-25,

[CtrlAltDel]

I-75, spanning FL, GA, TN, KY, OH, and MI, has none. There are through three exits repeated in five states: 2, 11, and 49.

Exit 2 does not exist in KY, and is only southbound in OH.
Exit 11 does not exist in OH, but there is an exit 12.
Exit 49 also does not exist in OH, but again, there is an exit 50A and 50B.

There are also 16 exits repeated in four states, but I didn't check the details: 5, 9, 13, 15, 29, 41, 59, 60, 62, 111, 122, 136, 144, 156, 164, and 181.

[SkyPesos]

I-75, spanning FL, GA, TN, KY, OH, and MI, has none. There are through three exits repeated in five states: 2, 11, and 49.

Exit 2 does not exist in KY, and is only southbound in OH.
Exit 11 does not exist in OH, but there is an exit 12.
Exit 49 also does not exist in OH, but again, there is an exit 50A and 50B.

There are also 16 exits repeated in four states, but I didn't check the details: 5, 9, 13, 15, 29, 41, 59, 60, 62, 111, 122, 136, 144, 156, 164, and 181.

Regarding I-75 in OH:
- There is a NB ramp for I-75 exit 2 (Western Hills Viaduct). It's a left exit
- I already mentioned it in a post above. For the lack of an exit 11 on I-75 in OH, the Galbraith Rd overpass is between mile markers 11.0 and 11.1, but the actual ramp to the exit is 10B NB and 10 SB. My guess for why 10 was used instead of 11 was to line up with the OH 126 exit, which I-75 SB doesn't have a direct connection to and need to use Galbraith to get to.

[CtrlAltDel]

I-75, spanning FL, GA, TN, KY, OH, and MI, has none. There are through three exits repeated in five states: 2, 11, and 49.

Exit 2 does not exist in KY, and is only southbound in OH.
Exit 11 does not exist in OH, but there is an exit 12.
Exit 49 also does not exist in OH, but again, there is an exit 50A and 50B.

There are also 16 exits repeated in four states, but I didn't check the details: 5, 9, 13, 15, 29, 41, 59, 60, 62, 111, 122, 136, 144, 156, 164, and 181.

Regarding I-75 in OH:
- There is a NB ramp for I-75 exit 2 (Western Hills Viaduct). It's a left exit
- I already mentioned it in a post above. For the lack of an exit 11 on I-75 in OH, the Galbraith Rd overpass is between mile markers 11.0 and 11.1, but the actual ramp to the exit is 10B NB and 10 SB. My guess for why 10 was used instead of 11 was to line up with the OH 126 exit, which I-75 SB doesn't have a direct connection to and need to use Galbraith to get to.

I'm sorry for reduplicating your efforts. I didn't see that you had already done I-75. Thanks, though, for these clarifications.

[SkyPesos]

I-75, spanning FL, GA, TN, KY, OH, and MI, has none. There are through three exits repeated in five states: 2, 11, and 49.

Exit 2 does not exist in KY, and is only southbound in OH.
Exit 11 does not exist in OH, but there is an exit 12.
Exit 49 also does not exist in OH, but again, there is an exit 50A and 50B.

There are also 16 exits repeated in four states, but I didn't check the details: 5, 9, 13, 15, 29, 41, 59, 60, 62, 111, 122, 136, 144, 156, 164, and 181.

Regarding I-75 in OH:
- There is a NB ramp for I-75 exit 2 (Western Hills Viaduct). It's a left exit
- I already mentioned it in a post above. For the lack of an exit 11 on I-75 in OH, the Galbraith Rd overpass is between mile markers 11.0 and 11.1, but the actual ramp to the exit is 10B NB and 10 SB. My guess for why 10 was used instead of 11 was to line up with the OH 126 exit, which I-75 SB doesn't have a direct connection to and need to use Galbraith to get to.

I'm sorry for reduplicating your efforts. I didn't see that you had already done I-75. Thanks, though, for these clarifications.

Np, you added a good amount in addition to what I had. I didn't check after the first 20 exits, and didn't know that 49 is also in 5/6 states. Also trying to find all the exits that are in 4/6 states would've tired me out after the first 2.
The main reason why I decided to do I-75 is that you have major metro areas in 3/6 of the states when I-75 enters it from the south; Miami (FL), Chattanooga (TN), Cincinnati (OH), and it's between Toledo and Detroit for MI. Because of that, I-75 would be the best chance we got for an interstate that goes through more than 2-3 states.

[SkyPesos]

Another one for a longer interstate: I-77 exit 1 in 5/5 states
SC: US 21/US 176/US 321
NC: I-485
VA: VA 620
WV: US 52
OH: OH 7

I'll update this post once I find more for interstates that goes through 5+ states

[Bickendan]

We could also do this comparing the intrastate Interstates to each other if I-17's exists are adjusted down to its 0 being at the southeastern interchange with I-10. Converting I-19's from metric to standard might not even be needed, either.

[SkyPesos]

We could also do this comparing the intrastate Interstates to each other if I-17's exists are adjusted down to its 0 being at the southeastern interchange with I-10. Converting I-19's from metric to standard might not even be needed, either.

Routes I looked up: 4, 12, 16, 17, 19, 27, 37, 43, 45, 87, 96, 97
In that case, I found an exit 1 on every intrastate interstate except I-97. For I-17, I counted exits 194 and 195A as exits 1A and 1B for this experiment respectively, because they're between mile markers 0 and 2 for I-17. I-97's first exit after it's southern termius is exit 5.

[ethanhopkin14]

We could also do this comparing the intrastate Interstates to each other if I-17's exists are adjusted down to its 0 being at the southeastern interchange with I-10. Converting I-19's from metric to standard might not even be needed, either.

Routes I looked up: 4, 12, 16, 17, 19, 27, 37, 43, 45, 87, 96, 97
In that case, I found an exit 1 on every intrastate interstate except I-97. For I-17, I counted exits 194 and 195A as exits 1A and 1B for this experiment respectively, because they're between mile markers 0 and 2 for I-17. I-97's first exit after it's southern termius is exit 5.

Interstate 2 and 14 in Texas have the I-17 issues, albeit for different reasons.