Interstates that meet no other interstates in a state.

[Brandon]

Historically speaking, I-80 in NV did not connect to any other Interstate until I-580 was designated recently (they probably still call that US 395, though).

Going much further back, I-15 did not connect to any other interstate in Nevada until I-515 and I-215 were designated.

[sprjus4]

Since we're not counting business Interstates, 585 in Spartanburg. If I'm not mistaken, I-520 in SC used to not link up with I-20 until a decade ago.

I-585 did originally connect with I-85 when it ran straight thru Spartanburg, but since it was relocated in the 90s, it doesn't need connect.

You're correct about I-520, the final piece linking it to I-20 in South Carolina opened in the early 2000s.

[debragga]

In the days before I-69, I-24 in Kentucky would have counted.

Possibly I-49 in Texas in the far future?

Probably not. They plan to connect I-369 to I-49 eventually.

I-49 will only have a few miles of road in Texas, up near the corner and far away from I-369

[sprjus4]

In the days before I-69, I-24 in Kentucky would have counted.

Possibly I-49 in Texas in the far future?

Probably not. They plan to connect I-369 to I-49 eventually.

I-49 will only have a few miles of road in Texas, up near the corner and far away from I-369

If I-369 is extended further north to meet I-49, it would all be in Texas.

I-369 currently is away from the I-49 location, in order to connect, a new location freeway would need to be built between I-30 and the future location of I-49.

[clong]

I-90 in Idaho

[thspfc]

I-535 in Wisconsin
I-72 in Missouri

[CNGL-Leudimin]

Going much further back, I-15 did not connect to any other interstate in Nevada until I-515 and I-215 were designated.

This means that before 1978 (when I-580 was first assigned, even though not signed until 2012) any Interstate entering Nevada didn't connect to any other Interstate . This continues to some extent, as the I-11/I-15/I-215/I-515 and I-80/I-580 systems don't intersect each other in the state. Until I-11 is extended to Reno in the far future...

[US 89]

Until I-11 is extended to Reno in the far future...

I-11 won't make it to Reno in our lifetimes. There's just no need to upgrade a road that carries 4000 cars a day to a full interstate.

[Ben114]

Going much further back, I-15 did not connect to any other interstate in Nevada until I-515 and I-215 were designated.

This means that before 1978 (when I-580 was first assigned, even though not signed until 2012) any Interstate entering Nevada didn't connect to any other Interstate . This continues to some extent, as the I-11/I-15/I-215/I-515 and I-80/I-580 systems don't intersect each other in the state. Until I-11 is extended to Reno in the far future...

If this is how it works, then I'll say I-95 in Maine.

[X99]

Until I-11 is extended to Reno in the far future...

I-11 won't make it to Reno in our lifetimes. There's just no need to upgrade a road that carries 4000 cars a day to a full interstate.

Tell that to FritzOwl.

[roadman65]

I-684 in CT.  It don't even connect with any other road in the state, and probably is the only interstate without an interchange within a single state.

[Henry]

Going much further back, I-15 did not connect to any other interstate in Nevada until I-515 and I-215 were designated.

This means that before 1978 (when I-580 was first assigned, even though not signed until 2012) any Interstate entering Nevada didn't connect to any other Interstate . This continues to some extent, as the I-11/I-15/I-215/I-515 and I-80/I-580 systems don't intersect each other in the state. Until I-11 is extended to Reno in the far future...

If this is how it works, then I'll say I-95 in Maine.

For 2di's whose offspring don't meet any routes other than their parent, the same is also true for I-95 in RI and DE, I-10 in MS and I-70 in WV.

[roadman65]

I remember before I-40 was completed in NC, I-95 had no interstate junctions at all.  Pretty soon it will have plenty more as I-795 and I-74 both were added this century already, plus you have pending I-87, I-587, I-42, and two I-295 hook ups being NC loves to upgrade US route freeways to interstate standards minus the expectant child near Fayetteville built to be one in its plans from scratch.

[sprjus4]

^

Interestingly enough, I-95 in North Carolina did not connect with any interstate highways until 1990 when I-40 was extended from Raleigh to I-95. Today, it connects to 4 interstate highways, I-40 built in 1990, I-795 built in 2003, I-295 built in 2005, and I-74 built in 2007, and at least 2 more connections are planned in the future, I-87 where the existing US-64 / I-95 junction is, and the southern terminus of I-295 currently under construction. When US-70 is upgraded to I-42 around the I-95 vicinity, a direct interchange may be constructed, making a 3rd addition. I-587 will be designated between Raleigh and Greenville in the future along US-264 as well, but that would overlap I-795 around the I-95 vicinity, not being a separate facility.

[SteveG1988]

I-684 in CT.  It don't even connect with any other road in the state, and probably is the only interstate without an interchange within a single state.

yeah, first post i got that one.

[TheGrassGuy]

I-684 in CT.  It don't even connect with any other road in the state, and probably is the only interstate without an interchange within a single state.

I-95/495 in DC: "Am I a joke to you?"

(technically DC isn't a state, but whatever)