Orphaned Interstates

[roadman65]

Would not I-95 in ME be one?  It only has junctions with its two child interstates that are intrastates there.

[NE2]

Would not I-95 in ME be one?  It only has junctions with its two child interstates that are intrastates there.

What's it orphaned from?

On the other hand, I-95 in NH does count.

[DandyDan]

The northern segment of US 395 in CA, however old US 299 did provide a connection to US 99 and the west coast.

California's US Routes are subdivided 6 ways:
1. The US 101- US 199 combo
2. US 97
3. the northern US 395 segment
4. the southern US 395 segment and US 6 combo
5. US 95
6. US 50

[roadman65]

Would not I-95 in ME be one?  It only has junctions with its two child interstates that are intrastates there.

What's it orphaned from?

On the other hand, I-95 in NH does count.

Well assuming that I-95 does not intersect any other primary interstate other than I-295 and I-395, which do not link with any other living interstate, you can say that the whole I-95 system in Maine is orphaned in this state.  Maybe not like in the 16 miles in NH where it does not connect with any interstate, even 3 digit spurs, but it still does not connect with any other interstate.

[Darkchylde]

Would not I-95 in ME be one?  It only has junctions with its two child interstates that are intrastates there.

What's it orphaned from?

On the other hand, I-95 in NH does count.

Well assuming that I-95 does not intersect any other primary interstate other than I-295 and I-395, which do not link with any other living interstate, you can say that the whole I-95 system in Maine is orphaned in this state.  Maybe not like in the 16 miles in NH where it does not connect with any interstate, even 3 digit spurs, but it still does not connect with any other interstate.

The problem with your logic there is that while I-95 in Maine doesn't connect to any Interstates but its child routes, it's also the only game in town as far as Interstates are concerned - whereas I-95 in NH isn't. There's simply nothing else there for Maine's I-95 to be orphaned from.

[roadman65]

Would not I-95 in ME be one?  It only has junctions with its two child interstates that are intrastates there.

What's it orphaned from?

On the other hand, I-95 in NH does count.

Well assuming that I-95 does not intersect any other primary interstate other than I-295 and I-395, which do not link with any other living interstate, you can say that the whole I-95 system in Maine is orphaned in this state.  Maybe not like in the 16 miles in NH where it does not connect with any interstate, even 3 digit spurs, but it still does not connect with any other interstate.

The problem with your logic there is that while I-95 in Maine doesn't connect to any Interstates but its child routes, it's also the only game in town as far as Interstates are concerned - whereas I-95 in NH isn't. There's simply nothing else there for Maine's I-95 to be orphaned from.

That way is true for I-95 being the only game in town as it is in RI and DE as well as I-80 is pretty much in NE.   NH has I-93 and I-89 in other parts of the state, is so true.  So, I see what you do mean as far as the topic is concerned. 

[1995hoo]

I think I-99 probably qualifies as a recent unconnected, signed segment because it does not connect directly to another Interstate at its southern terminus–you have to use Business 220 to reach the Pennsylvania Turnpike entrance. When the road opened, its northern end didn't connect to another Interstate either. (Edited to add: I don't mean to imply it's still unconnected; I was just responding to the query about when was the last time such a segment existed.)

It's debatable on how "connected" it is at the northern end at the current time as well.

Never been there and couldn't really tell too well from looking at a map, hence why I didn't say anything about that end.

[Duke87]

If I-99 doesn't count as connected to I-80, then I-587 doesn't count as connected to I-87, either.

[NE2]

The I-87/I-587 connection has no lights, only merges and splits.

I-99 also has a local road intersection south of I-80.

[Michael in Philly]

Would not I-95 in ME be one?  It only has junctions with its two child interstates that are intrastates there.

I thought the original premise was Interstates not connected to other Interstates in their states.  I.e., is the state's Interstate system self-contained.  By that definition, Maine's is.

[1995hoo]

I thought the original post was asking for segments of the Interstate system from which you cannot drive anywhere else in that particular state or territory, without leaving said state or territory, while remaining on the Interstate system. For example, the original post cites I-66 in the District of Columbia. The only way to drive somewhere from DC's I-66 while remaining on the Interstate system is to drive to Virginia–any other connection in DC requires exiting the Interstate. Likewise, the tiny segment of I-95/I-495 in DC (on the Wilson Bridge) connects to no other route anywhere in the District. You therefore cannot drive to anywhere else in DC from that segment while both staying in DC and staying on an Interstate. But the District's portions of I-295, I-395, and I-695 would not qualify because you can get somewhere else in the District via the Interstate if you exit one of those routes onto another–for example, a driver who enters the city on I-395 can continue onto I-695 and then I-295 in order to reach Blue Plains.

I-70 and I-470 in Wheeling, or I-59 and I-24 in Georgia, fall within the same umbrella because they do not connect to the rest of the Interstate system in their respective states. In the Wheeling example if you want to stay on the Interstate you have to go to Ohio or Pennsylvania, and in the Georgia example you have to go to Alabama or Tennessee.

Maine seems like it would be a peculiar situation where there is no other Interstate anywhere in the state. Rhode Island and Delaware probably fall within the same category–there's just I-95 and some x95s. So in those states there's nothing from which these roads could be "orphaned." Compare it to Massachusetts, where there are multiple Interstates (I-90, I-91, I-84, I-93, and I-95, along with various 3di routes) but you can drive from any segment of any one of them to any other segment without having to leave the Interstate system, although obviously doing that could require going well out of your way to accomplish it.

[Duke87]

The I-87/I-587 connection has no lights

Unless it's changed since I was last there, neither does the I-80/I-99 connection. There are stop signs at the bottom of the offramps from I-80, though.

[NE2]

The I-87/I-587 connection has no lights

Unless it's changed since I was last there, neither does the I-80/I-99 connection. There are stop signs at the bottom of the offramps from I-80, though.

I meant to say no at-grade intersections. No movements crossing (weaving doesn't count, or a cloverleaf could not be on a freeway).

[roadman65]

That means, under the defintion of this topic, I-176 in PA was once orphaned as well.  Before the Morgantown Interchange was redone,  I-176 did not connect to its parent directly.  It ended at a STOP SIGN with PA 23 and you had to use PA 23 and PA 10 to get to I-76.

[empirestate]

I thought the original post was asking for segments of the Interstate system from which you cannot drive anywhere else in that particular state or territory, without leaving said state or territory, while remaining on the Interstate system.

Sort of. I believe the question is this: Consider the bulk of a state's Interstate system, then find a piece of Interstate, or a smaller group of connected Interstates, elsewhere in the state that has no in-state Interstate connection to the bulk.

So in Georgia, for example, you have the main system of 20, 75, 85, 16, 95 and all of their 3dis, all interconnected in some way. Now drive from any of those highways to I-59 or I-24, without leaving either Georgia or the Interstate system. Since you can't, I-59 and I-24 are "orphaned" in Georgia, despite being connected to each other.

On the other hand, in Maine the bulk of the system is I-95 and its 3dis (195 thru 495). You can get from all of those Interstates to each other without leaving the state or the system, and there's no other Interstate in Maine that you can't get to. Thus, Maine has no orphans.

Question is, in Nevada, which system is the main and which the orphan? I-15 and its 3dis have more population but fewer miles than I-80 and its apocryphal 3di.

[OCGuy81]

I-535 in Wisconsin.

[mgk920]

I-535 in Wisconsin.

The IP mentioned it.

Mike

[OCGuy81]

The IP mentioned it.

My bad.  Thanks Mike.