Longest Interstate You Haven't Been On

[Ted$8roadFan]

I-35.

[therocket]

I-75 (7th longest)

[Hunty2022]

I-90. Longest I have been on is probably I-40.

[Rothman]

Checking my logs: The longest I haven't touched is I-A1 in Alaska.  After that, I am unsure about I-8 (although I could swear I ended up on a short section of it around Yuma; just not sure where, exactly).  After that, I-A4...after that, I-45.

No change, here.

Still no change, although it may do so later this year...

[wriddle082]

I-5

Went to the Bay Area last year to work for 3 weeks, drove most of the interstates in the area, but never ventured east towards Sacramento or Stockton to get any part of I-5.

Just a few short months after I made that post, I flew into Sacramento and finally drove on I-5 leaving the airport and went as far south as US 50.  For such a long highway, it's still the only portion of it that I have.

So after recalculating, I-8 is now the longest interstate I have never driven on, followed by I-39, then probably I-82.

[clong]

It's either I-80, I-15 or Western I-84 - ironically all travel in or near SLC.

I went to conferences in Reno and SLC in the late 90s, but took a taxi from the airport to the convention center and don't know the route we took in either place.

If you went to downtown SLC, you probably took both I-80 and I-15.

Actually, probably not I-15. The fastest way from the SLC airport to the convention center is almost certainly the 600 and 500 South ramps directly from I-80; that movement does not involve I-15. That interchange was reconfigured around 2000, but I'm fairly sure the actual 15/80 merge point was still beyond the downtown viaducts.

Though unlikely, there's a chance that your taxi took North Temple into the city, which doesn't use any freeways. If you remember taking a freeway, it was almost certainly I-80.

I remembered I had been on I-80 when I went to Reno for a conference, so my answer is now either I-15 (possibility of a very short stint in Salt Lake City) or Western I-84.

After my 2023 Summer vacation trip, my new answer is I-A1 at 406 miles. For the lower 48, I-8 at 353 miles.

[StogieGuy7]

This little exercise has me realizing just how many interstates that I've had the opportunity to be on - and have driven on all of them too. Basically, I've never been on I-19, I-27, I-82, the new I-2 and I-14, the Hawaii Interstates, nor any the Alaska "Interstates" (which I am not counting).

Of all these, I think it's I-27 that is the longest that I haven't been on.  I've driven by the north end of it in Amarillo, just as I've driven by the eastern terminus of I-82 near Hermiston, OR. But neither of those counts.

Disclosure: admittedly not counting 3di's - though I've been on most of them too.

[rlb2024]

For me it's probably I-82 -- although I drove a large chunk of I-182 a couple of weeks ago.  There aren't many 2di's that I haven't been on  -- I-2, I-41 (although I traveled parts of it before it became I-41), I-86, and I-99 (although I traveled parts of it before it became I-99) are the only ones that come to mind, plus whatever ones North Carolina has added in the past couple of years in the eastern part of the state.

[cstp3103]

Somehow I've never been on I-80

[paulthemapguy]

I have a photo of I-20 shields from Terrell, TX; Tuscaloosa, AL; Atlanta, GA; and Birmingham, AL.  But at no point did I actually drive on any of I-20's carriageways.  Second place goes to I-85

I drove on a bit of I-20 this past January, so I-85 is now my answer 

I drove on I-85 back in 2021. My new answer is I-91. I also see that the next-longest highway is I-45, which I also haven't driven on.

[tmoore952]

I-35.

[bwana39]

I-35.

I-57 I have never been on I-57. That will change in the not so distant future, It also would be the closest.

[adwerkema]

I was curious what mine was. Looked it up, and found out it was I-25. Odd, considering I've been through all three states I-25 is in.

What's yours?

Mine is now I-84 (western section).

[JayhawkCO]

Clinched I-PR2 this weekend, so my top five are now:

I-35W (TX) - 86.69 miles
I-196 (MI) - 80.85
I-840 (TN) - 77.75
I-390 (NY) - 76.01
I-380 (IA) - 73.84

I've intersected all of them.

[jlam]

After a couple of years, here are my new top 5:

I-65 - 897.96 mi
I-81 - 859.13 mi
I-85 - 676.81 mi
I-77 - 614.07 mi
I-49 - 560.52 mi

[74/171FAN]

I-15 for me at this point.

[cenlaroads]

I-80, followed by I-70.

It looks like I overlooked a few.  The longest interstate I haven't been on is actually I-25.  The next longest is I-74.

[Rothman]

I-80, followed by I-70.

It looks like I overlooked a few.  The longest interstate I haven't been on is actually I-25.  The next longest is I-74.

So...you have been on I-80 and I-70 now.

[cenlaroads]

I-80, followed by I-70.

It looks like I overlooked a few.  The longest interstate I haven't been on is actually I-25.  The next longest is I-74.

So...you have been on I-80 and I-70 now.

I had been on them the first time I answered, I just overlooked them.  I missed I-80's concurrency with I-15 and a small portion of I-70 that I travelled in Missouri.

[pderocco]

The only ones I haven't been on that are longer than 200 miles are I-69 (880 miles) and I-49 (528 miles). In fairness, there are some that I've only driven a few miles of, where they multiplex with another route through some city.

[hobsini2]

On the eastern side, where do you all think the Midwest begins/ends? Most common answer is OH border with WV or PA, though I've seen Pittsburgh and Buffalo get included in sometimes, and I know some East coasters think the Midwest begins west of I-81.

I just realized I never got back to you about this question Sky. The eastern boundary I would say is the Ohio River and Allegheny River to the NY Line then west to Lake Erie. So Erie is in, Buffalo is out and Pittsburgh is borderline.

[Rothman]

On the eastern side, where do you all think the Midwest begins/ends? Most common answer is OH border with WV or PA, though I've seen Pittsburgh and Buffalo get included in sometimes, and I know some East coasters think the Midwest begins west of I-81.

I just realized I never got back to you about this question Sky. The eastern boundary I would say is the Ohio River and Allegheny River to the NY Line then west to Lake Erie. So Erie is in, Buffalo is out and Pittsburgh is borderline.

Off-topic.

[Ted$8roadFan]

Also I-5.

[invincor]

I-20 (10th longest).

After that, the next would be I-81 (18th longest).

[boilerup25]

Mine is Interstate 35.