Controlled Access Roads that lack connections despite being close to each other.

[SteveG1988]

Prime Example, other than via I-195 and the Delaware Memorial bridge the turnpike and I-295 in NJ never have a proper interchange. 

[NE2]

Other than the endpoints, there are no connections between I-495 and the HOT lanes.

[SteveG1988]

Also, short breezewoods count for a connection, but if it is more than a mile to connect then it counts. For example I-80 and I-476 do meet, it is just via a city street, but 295 connecting via CR541 or NJ73 in burlington county to the Turnpike does not. I consider the 80/476 breezewood to be an exit ramp with a cross road where you do not have to actually use the cross road to connect except by going accross it.

[NE2]

For example I-80 and I-476 do meet, it is just via a city street,

What city?

but 295 connecting via CR541 or NJ73 in burlington county to the Turnpike does not.

Why not? It's 1/2 mile on NJ 73.

[SteveG1988]

For example I-80 and I-476 do meet, it is just via a city street,

What city?

but 295 connecting via CR541 or NJ73 in burlington county to the Turnpike does not.

Why not? It's 1/2 mile on NJ 73.

I was thinking about "is it really a mile or is it more like half a mile" But otherwise the turnpike and 295 have no direct connections where they are not using another road to run accross. Much like how I-55 in MS has to use a standard street to connect to Future 22 just more of an expressway on NJ73.

[roadman]

In Massachusetts, I-90 (MassPike) and I-391 have no direct connection, although I-391 passes beneath I-90.

[Roadrunner75]

If "close" includes crossing over one another (as in the preceding example), I will put forth 95 and the PA Turnpike/276 which of course many of us are probably sick of talking about.

OH 11 and I-76 (OH Turnpike)

US 30 (freeway portion) and I-83 in York, PA 

NJ 21 (freeway portion) and I-280 in Newark, NJ

[TheHighwayMan3561]

I-80/90 (OH Turnpike) and I-475 just west of Toledo.

[dfwmapper]

I-680 and I-880 in Fremont/Milpitas. Less than 2 miles apart for about a 10 mile stretch, but no controlled-access connection.

[1995hoo]

There's a segment of Florida's Turnpike that runs right alongside I-95 for a good distance, very similar to the Jersey Turnpike and I-295, with no access between them until you go a good distance further north to a breezewood at Fort Pierce.

[froggie]

Much like how I-55 in MS has to use a standard street to connect to Future 22

I-269 is to be the connection between 55 and 22.

[PHLBOS]

(Harrisburg Int'l) Airport Connector Road linking PA 283 to the airport (MDT) crosses over I-76 (PA Turnpike).

[NE2]

(Harrisburg Int'l) Airport Connector Road linking PA 283 to the airport (MDT) crosses over I-76 (PA Turnpike).

And they have a connection via I-283.

[SectorZ]

I believe, for a brief period of time, MA 146 at I-90 was upgraded to it's current controlled access standards before the interchange was built and opened. I know the interchange on the Pike opened in the late 90's.

A partial disconnect, I-495 to I-95 south, or I-95 north to I-495 in Salisbury MA is not an option as you need to take MA 110 to each.

Similar to above at CT-15/US 7 in Norwalk CT. And, even though they junction further north, I-91 and CT 15 are all of 1500' from each other for a bit in North Haven.

As well stated prior, biggest example in New England is the I-90/I-391 complete lack of interchange.

[Thing 342]

The US-35 freeway does not directly interchange with I-71 near Jefferson. Connecting traffic must use OH-435 (Old US-35), which meets I-71 at a diamond interchange.

[cl94]

I-81 and I-476 in Scranton
I-87 and NY 85 in Albany
I-80 and I-271 south of Cleveland
I-87/I-287 and NY 304 in Nanuet (limited-access section of NY 304 ends 1/4 mile south of crossing, only connection is via NY 59)
I-87 and Sprain Brook Parkway in Yonkers (ROWs separated by 500 feet)
LIE and FDR Drive in Manhattan

[Pete from Boston]

Wilbur Cross Parkway and CT 40.

The FDR is a couple of blocks from the Midtown Tunnel (not the LIE) and that's well under the OP's mile cutoff.  Just saying.

[SSOWorld]

I-294 (Tri-State Tollway and I-290 parallel each other neck and neck after crossing (Hillside Strangler) west of Chicago (I think a mile)
I-88 and I-355 do the same but not as long.

[jp the roadgeek]

NJTP and I-76/NJ 42 is a glaring one.  The movement from CT 15 N to CT 8 S is made by taking CT 25 S; the connection from CT 8 N to 15 S is made by using CT 25 N, and the connection from CT 8 S to CT 15 N is used by a 300' or so Breezewood along CT 108 South.  In Meriden, there is also no direct connection from CT 15 S to I-691/CT 66 E (either have to go down US 5 South, or take East Main St into CT 66), also none between CT 15 N and I-91 S,  or CT 15 S and I-91 N or I-691 E and CT 15 N (also using US 5 N).  Also, there used to be a CT 15 S/I 91 N in Hartford that is gone, and no direct connection from I-91 N to I-84 E without taking the CT 15 N connection (and sitting in a 2 mile bottleneck).  Last ones: Opposite direction connections between I-95 and I-395 (use CT 85), or between I-395 S and CT 2 W.  RI: No direct connect between I-95 N and RI 4 S, or RI 4 N and I-95 S, or between opposite directions of I-95 and I-295 (use RI 113).

[national highway 1]

For example I-80 and I-476 do meet, it is just via a city street,

What city?

It's an at-grade link road which crosses PA 940 between two trumpet interchanges in Kidder Township, PA.

[roadman]

I believe, for a brief period of time, MA 146 at I-90 was upgraded to it's current controlled access standards before the interchange was built and opened. I know the interchange on the Pike opened in the late 90's.

Nope.  MA 146 at I-90 in Millbury was not upgraded to controlled access until the interchange with I-90 and "parkway" extension into Worcester were built.  There's still a section of 146 south of I-90 that is still not controlled access, althougn most median crossings have been closed off.

[Henry]

There is no access between I-95 and I-895 in Baltimore where they go into their respective tunnels. (On the latter route, you're at a disadvantage anyway as you must pay the toll in order to exit somewhere, with the exception of the northernmost two interchanges going southbound.)

[PHLBOS]

(Harrisburg Int'l) Airport Connector Road linking PA 283 to the airport (MDT) crosses over I-76 (PA Turnpike).

And they have a connection via I-283.

That interchange (Harrisburg East) is about 2 miles west of the PA 283/Airport Connector interchange and I was under the impression that the OP was referring to direct connections as opposed to indirect connections .  If the OP's using less than one mile to be considered close, then the above example could apply.  OTHO, if the OP's using five miles as a maximum threshold for close, then the Tunrpike/Airport Connector example would not apply.

[bzakharin]

In NJ, I-295 Northbound has no access to NJ-42, and NJ-42 has no access to I-295 Southbound. This should eventually be fixed, but not by the current project.
NJ-42 North also does not have access to NJ-55, and NJ-55 has no access to NJ-42 North (though these movements are signed via a short link using local streets).
There is no interchange between NJ Turnpike Pennsylvania Extension (secret/future I-95) and I-295

[TheStranger]

I-880 and Route 87 in San Jose is the one Bay Area example that stands out to me (overcrossing without any ramps).