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[Rothman]

Closest Interstate: I 495X/Cabin John Parkway

Cabin John is designated an Interstate?

[1995hoo]

Closest Interstate: I 495X/Cabin John Parkway

Cabin John is designated an Interstate?

An unsigned one, yes.

[Rothman]

Closest Interstate: I 495X/Cabin John Parkway

Cabin John is designated an Interstate?

An unsigned one, yes.

Huh.  Makes me wonder how it has been missed on Travel Mapping.

[US 89]

2di: I-12
3di: I-165 (AL)

[bwana39]

3DI's would Be I-430 and I-630 in Little Rock.

I-24 would seem to be it, but I MAY have been on a concurrency in Nashville.

Other than that probably I-26.   I-57.

I have never technically been on I-76, but I was on I-80S before the numbering was changed.

[tmoore952]

3DI's would Be I-430 and I-630 in Little Rock.

I-24 would seem to be it, but I MAY have been on a concurrency in Nashville.

Other than that probably I-26.   I-57.

I have never technically been on I-76, but I was on I-80S before the numbering was changed.

If what I am reading online is accurate, both the eastern and western I-76 were I-80S in the past.
I was already aware of the eastern I-76 being that way with that change occurring in 1964, as I am in that part of the country, but I didn't know western I-76 was also that way (in the 70s??)
Which one do you mean?

[adwerkema]

For 2dis, my answer is I-14. My answer for 3dis is I-635, though I have intersected it.

Same, same, and same.
2-di: I-14
3-di: I-635, but have intersected it.

[bwana39]

3DI's would Be I-430 and I-630 in Little Rock.

I-24 would seem to be it, but I MAY have been on a concurrency in Nashville.

Other than that probably I-26.   I-57.

I have never technically been on I-76, but I was on I-80S before the numbering was changed.

If what I am reading online is accurate, both the eastern and western I-76 were I-80S in the past.
I was already aware of the eastern I-76 being that way with that change occurring in 1964, as I am in that part of the country, but I didn't know western I-76 was also that way (in the 70s??)
Which one do you mean?

The Denver to Nebraska {US-6} one.  I really didn't realize there were two disparate segments like this. I have crossed the Walt Whitman Bridge so I have evidently been on the eastern segment.

[Rothman]

Closest Interstate: I 495X/Cabin John Parkway

Cabin John is designated an Interstate?

An unsigned one, yes.

Huh.  Makes me wonder how it has been missed on Travel Mapping.

Sounds like it's just a designation by MDOT rather than recognized by FHWA as part of the Interstate Highway System.

[jlam]

2di: Western I-86 (~425 mi)
2di uncrossed: I-49 (~559 mi)

3di: I-180 WY (~40 mi)
3di uncrossed: I-135 KS (~400 mi)

[NWI_Irish96]

Overall: I-380
2di: I-49

[LilianaUwU]

My answer, as a Québecer who never went to the US, is probably I-95.

[IowaTraveler]

2di: I-43
3di: Until about a month ago, my answer would have been I-235 (The one in Iowa). Now my answer is a bit more complicated. From home, the closest 3di I haven't been on is I-474, with I-172 in a very close second. From school, the closest 3di I haven't been on is I-129.

[Ted$8roadFan]

Also, I-395 in Maine.

[CNGL-Leudimin]

My answer, as a Québecer who never went to the US, is probably I-95.

Likewise, any Europeans that have never been to the US like me have I-95 as the answer.

[US 89]

My answer, as a Québecer who never went to the US, is probably I-95.

Likewise, any Europeans that have never been to the US like me have I-95 as the answer.

95 would also be the answer for any South Americans or southern Central Americans that haven't been closer to the US - but through its southernmost extent in Miami.

[Streetman]

My answer, as a Québecer who never went to the US, is probably I-95.

Seems to me for most in the province of Québec who never crossed the border it would be I-87, 89, or 91.

[TheRhodeGeek]

2di: I-89 (was going to say I-90 until I realized I have been on the portion east of the I-93 interchange)
3di: I-395 (MA/CT) (I have been on 290 though) or I-291 (CT)
Yes, I have been on portions of all of the major interstates in RI, MA, and CT (84 and 91 were CT only)

[The Nature Boy]

I-68

[webny99]

2di: I-68, 340 miles by road (but only 240 as the crow flies, thanks northern PA)
3di: I-890, 205 miles by road

[drebbin37]

Close call for me...
Overall: I-878 just beats I-478 (I rarely drive in NYC)
2-digit: I-87 in North Carolina beats I-73, but that's fairly close, too

[CovalenceSTU]

Somehow I've never been on I-84.

[DandyDan]

For 2DI, it's likely I-49 for N-S interstates and I-44 for E-W interstates. It's possible I-96 is closer in straight line distance.

For 3DI, I assume it's I-535, with I-172 ready to take over that title when (and if) I go to Duluth in August.

I should update this and give an explanation. For 2di's, the N-S interstate remains I-49. As for the closest E-W interstate, I was not on I-44 as signed in 2006, the year I was last in St. Louis, but I have been on the parts of the current I-44 which used to be I-70 and I-55 before the Stan Musial Bridge was built. If it counts that I have been on I-44, then I assume it's I-96.

For 3di's, I made it to Duluth and, in spite of the current construction there, made it onto I-535, so now it's officially I-172.