Is there an Interstate that goes through a state with no exit?

[hbelkins]

How about I-495 at the PA/DE line?

[Laura]

4, 12, 66, 86w, 87, 88e, 99

Probably not a complete list, but yeah, it's been done.

99 is signed now in NY. Pretty sure someone posted pictures of this within the past week, actually.


iPhone

[PHLBOS]

How about I-495 at the PA/DE line?

While I-495 enters PA, it doesn't go through it; it ends just north of the state line.

[1995hoo]

4, 12, 66, 86w, 87, 88e, 99

Probably not a complete list, but yeah, it's been done.

2, 4, 12, 16, 17, 19, 27, 37, 43, 45, 73, 86 west, 87, both 88s, 96, and 97 (not counting Hawaii's for obvious reasons, nor the unsigned ones in Alaska or Puerto Rico). I suppose you could count I-66 as not entering two states due to the District of Columbia not being a state, but the comment to which you were responding asked for 2di routes "totally within a single state," so I-66 would not satisfy that criterion.

[Kacie Jane]

Don't know how I forgot the Arizona ones (the rest I'll forgive myself for, but 17/19 should have been obvious)... 66 was an unexcusable cockup on my part, 99 was just a bit of more innocent forgetfulness.  Ah well, I'll post a little slower next time.

[1995hoo]

Don't know how I forgot the Arizona ones (the rest I'll forgive myself for, but 17/19 should have been obvious)... 66 was an unexcusable cockup on my part, 99 was just a bit of more innocent forgetfulness.  Ah well, I'll post a little slower next time.

Heh. DC's segment of I-66 is utterly forgettable other than the ancient sign bridge located near the Saudi Arabian embassy!

[roadman65]

4, 12, 66, 86w, 87, 88e, 99

Probably not a complete list, but yeah, it's been done.

2, 4, 12, 16, 17, 19, 27, 37, 43, 45, 73, 86 west, 87, both 88s, 96, and 97 (not counting Hawaii's for obvious reasons, nor the unsigned ones in Alaska or Puerto Rico). I suppose you could count I-66 as not entering two states due to the District of Columbia not being a state, but the comment to which you were responding asked for 2di routes "totally within a single state," so I-66 would not satisfy that criterion.

Yes you cannot say that I-66 is not intrastate even though it is only in the Commonwealth of Virginia as far as states go.

I-295 is actually an interesting piece as not only does this happen to in MD as far as states go while its other is DC, but one that could arguably be considered one without a proper mainline exit in MD back before it was extended to MD 210 a couple decades ago due to its one interchange was the actual terminus.

[Henry]

That is a tricky one!

For me, I-275 in IN comes to mind, probably because most people tend to forget that it exists there, in addition to OH and KY. But then I remember that it starts a concurrency with I-74 from Indianapolis and continues until they split off on the OH side, where the 2di takes its course into Cincinnati.

And speaking of Interstates missing state borders, the lower end of I-485 runs very close to SC.

[Brandon]

That is a tricky one!

For me, I-275 in IN comes to mind, probably because most people tend to forget that it exists there, in addition to OH and KY. But then I remember that it starts a concurrency with I-74 from Indianapolis and continues until they split off on the OH side, where the 2di takes its course into Cincinnati.

And speaking of Interstates missing state borders, the lower end of I-485 runs very close to SC.

However, I-275 does have one interchange in Indiana.
https://www.google.com/maps?ll=39.125399,-84.82707&spn=0.039684,0.084543&t=h&z=14

[SteveG1988]

Does it count if it is a freeway merging in for an exit? for example prior to 1999 there was only one exit along the PA turnpike Extension of the NJ TUrnpike which was at the time I-276. It was a eastbound sliproad exit, would that have counted for this?

[PHLBOS]

Does it count if it is a freeway merging in for an exit? for example prior to 1999 there was only one exit along the PA turnpike Extension of the NJ TUrnpike which was at the time I-276. It was a eastbound sliproad exit, would that have counted for this?

Since the OP's only asking regarding Interstates; the above would not count.  The NJ Turnpike portion of the PA Turnpike Connector pre-1999 is not part of I-276.

[Duke87]

The Indiana Toll Road gets closer to Michigan at one point.  Approximately 1000 feet, if memory serves.

I-44 comes within 1000 feet of Kansas without entering it. And I-29 gets within 1000 feet of Nebraska without entering it (repeatedly, about 500 feet at the closest). But I-84/NJ still wins easily.

[jp the roadgeek]

 I-495 comes to within 200 feet or so of the NH line near its (non-exit) junction with MA 108?

[PHLBOS]

I-495 comes to within 200 feet or so of the NH line near its (non-exit) junction with MA 108?

Close but no cigar.

[robbones]

I 865 in Indianapolis has no exits

[NE2]

I 865 in Indianapolis has no exits

Even in the literal sense (and the question is obviously about interchanges, not exits per se) it has one for I-465 south.