States with a 3di, but not the root 2di

[midwesternroadguy]

Can you think of examples where a state has an interstate 3di, but the root 2di doesn't enter the state? 
Examples: 

I-535 crosses into Superior, Wisconsin, but I-35 never enters Wisconsin from Duluth, Minnesota.
I-287 enters New Jersey from I-87 in New York
I-275 enters Indiana near Cinncinati, but I-75 remains in Ohio
I-155 enters Tennessee from I-55 in Missouri
I-129 enters Nebraska from I-29 in Sioux City, Iowa

[1995hoo]

I-95 does enter the District of Columbia's airspace for less than a quarter of a mile, but for practical purposes you could probably list I-95 and DC (I-295 and I-395 are partially in DC and I-695 is entirely within the District). Or at least you could give it an honorable mention. I'd wager 99 percent of people who use I-95 over the Wilson Bridge have no idea they're passing through DC.

[agentsteel53]

honorable mention: I-395 enters Massachusetts somewhat far away from I-95.  the 95/395 connection is in Connecticut.

[Brandon]

Can you think of examples where a state has an interstate 3di, but the root 2di doesn't enter the state? 
Examples: 

I-535 crosses into Superior, Wisconsin, but I-35 never enters Wisconsin from Duluth, Minnesota.
I-287 enters New Jersey from I-87 in New York
I-275 enters Indiana near Cincinnati, but I-75 remains in Ohio
I-155 enters Tennessee from I-55 in Missouri
I-129 enters Nebraska from I-29 in Sioux City, Iowa

However, I-55 does enter Tennessee in the Memphis area.  There could be a separate category for 3dis that enter a state independently of their parent 2di and never meet their parent 2di in said state.  There are plenty of those examples as well such as I-395 in Massachusetts entering independently from I-95 and never meeting either I-95 or another I-x95 connected to I-95 within the state.

[english si]

I-684 in CT is a 'independent' 3di, not meeting it's parent, as are I-276 and I-278 in NJ (though I-278 doesn't meet it's parent at all).

I-195 in MA doesn't meet I-95, but does meet I-495.

[roadman]

honorable mention: I-395 enters Massachusetts somewhat far away from I-95.  the 95/395 connection is in Connecticut.

Another honorable mention - I-195 in Massachusetts, which leaves I-95 in Rhode Island and connects to I-495 in Wareham.  Any other states where a 3di connects to a different 3di of the parent 2di, but does not then reconnect to the parent 2di?

[OracleUsr]

How close would I-78 (and I-278/678) in NY be to qualifying?  I.e., how long is it in New York?

Can't forget California, or is there an I-38 somewhere in the state?

[agentsteel53]

Any other states where a 3di connects to a different 3di of the parent 2di, but does not then reconnect to the parent 2di?

not a multistate example, but I-175 and I-375 in Florida both spur off I-275.

[1995hoo]

honorable mention: I-395 enters Massachusetts somewhat far away from I-95.  the 95/395 connection is in Connecticut.

Another honorable mention - I-195 in Massachusetts, which leaves I-95 in Rhode Island and connects to I-495 in Wareham.  Any other states where a 3di connects to a different 3di of the parent 2di, but does not then reconnect to the parent 2di?

Not a state, but the aforementioned I-695 in the District of Columbia connects to I-395 at one end and I-295 at the other. It doesn't connect to I-95 at all, although in fairness I should point out that once upon a time I-395 was I-95, so back then there was a connection.

[jrouse]

Any other states where a 3di connects to a different 3di of the parent 2di, but does not then reconnect to the parent 2di?

In California:  I-280, I-380, I-980, I-105.
If interstate designation matters, then you could argue I-210 would make the list, since it changes to CA-210, and connects to it's parent route under that designation.

[vdeane]

Eastbound, NY's I-78 is 1.2 miles.  Westbound, it's 0.8.  None of this mileage is freeway, nor does it go anywhere near any I-X78.

[bugo]

I-684 in CT is a 'independent' 3di, not meeting it's parent, as are I-276 and I-278 in NJ (though I-278 doesn't meet it's parent at all).

I-195 in MA doesn't meet I-95, but does meet I-495.

Your name includes "english" but you can't correctly use apostrophes?

[NE2]

[hbelkins]

Any other states where a 3di connects to a different 3di of the parent 2di, but does not then reconnect to the parent 2di?

not a multistate example, but I-175 and I-375 in Florida both spur off I-275.

Also, I-795 in Maryland and I-990 and I-590 in New York.

[andrewkbrown]

Any other states where a 3di connects to a different 3di of the parent 2di, but does not then reconnect to the parent 2di?

Interstate 670 in Columbus, Ohio.

[JCinSummerfield]

I-275  & I-196 in Michigan

[NE2]

I-275  & I-196 in Michigan

what

[SSOWorld]

I-275  & I-196 in Michigan

I-196 connects to I-96 and I-275 connects to I-75 at the south end, so I don't know what you're smokin'

[JCinSummerfield]

My bad.  Didn't read the whole post.  I saw "doesn't reconnect to the parent 2di".

[NE2]

I saw "doesn't reconnect to the parent 2di".

Which is a problem for I-196 why? (It's not even a problem for I-275, since both ends are at Interstates.)

[topay]

Virginia doesn't have any...though it could one day get an "honorable mention".  If US 29 near Danville ever gets upgraded to I-785, it'll fall into the category of entering the state independently and not connecting to I-85 within VA.

Back here in 2013...I-370 in Maryland also gets an "honorable mention" for connecting to a 3di (I-270) but not I-70.

[roadman65]

Whenever PA gets that I-95/ I-276 interchange done in Bensalem, PA that will  finally link the two I-95 segments together, I-295 will not be connected at all to its parent in New Jersey.  Remember that I-295 is not interchanged with the NJ TPK Pennsylvania Extension and when the PA EXT becomes I-95, they will cross, but not interact with one another.

[SSOWorld]

I saw "doesn't reconnect to the parent 2di".

Which is a problem for I-196 why? (It's not even a problem for I-275, since both ends are at Interstates.)

He misread the topic.

[NE2]

I saw "doesn't reconnect to the parent 2di".

Which is a problem for I-196 why? (It's not even a problem for I-275, since both ends are at Interstates.)

He misread the topic.

My question stands. Why would I-196 not returning to I-96 ever be an issue?

[empirestate]

I saw "doesn't reconnect to the parent 2di".

Which is a problem for I-196 why? (It's not even a problem for I-275, since both ends are at Interstates.)

He misread the topic.

My question stands. Why would I-196 not returning to I-96 ever be an issue?

Who said it was? It was mentioned as fitting the (misunderstood) topic, not as being a problem or issue.

I believe your point is that any odd 3di should fit the topic (again, misunderstood as not connecting to the parent 2di), which is true, so there would be a lot of answers. Good thing we're not discussing that question!