The windmill interchange offers nearly identical traffic flow to the stack

[cpzilliacus]

The Capital Beltway part of I-95 in Prince George's County, Maryland has 3/4 of such an interchange at U.S. 50 (John Hanson Highway, "secret" I-595, Exit 19) here.

It replaced a traditional cloverleaf in the late 1980's or early 1990's. 

[zzomtceo]

The Capital Beltway part of I-95 in Prince George's County, Maryland has 3/4 of such an interchange at U.S. 50 (John Hanson Highway, "secret" I-595, Exit 19) here.

It replaced a traditional cloverleaf in the late 1980's or early 1990's.

It appears to be more of a turbine interchange, with a dash of cloverleaf.

[PColumbus73]

https://maps.google.com/maps?q=jackson,+oh&ll=39.045969,-82.613668&spn=0.010849,0.01929&hnear=Jackson,+Ohio&t=h&z=16

Although this is not a freeway to freeway interchange, this is (as far as I know) the only windmill interchange in the United States (if not beyond).

This is an interesting design.  Essentially it is a Parclo B4 interchange with the loop ramps in the median of the arterial street. 

Reminds me a lot of the former I-94/Telegraph Road (US-24) interchange.

Of course, with left ramps, you have the interchange at the Ford and the Lodge.

Since I'm currently living in the Myrtle Beach area, I am very familiar with this interchange. SC 31 (Carolina Bays Parkway) drops from 65 MPH to 50 through the interchange. I'm not particularly fond of this interchange because the ramps from NB 31 to SB 501, SB 31 to NB 501, NB 501 to NB 31, and SB 501 to SB 31 have very short accel/decel lanes. On top of that, all the ramps I just mentioned have almost no advance sight distance.

Personally, I think either a 3-level roundabout or 3-level SPUI would be better here.

[hbelkins]

Why wouldn't a cloverleaf with C/D lanes have worked?

[Alps]

Why wouldn't a cloverleaf with C/D lanes have worked?

Check it - this design has larger loop radii than a cloverleaf would allow in this space. How about a SPUI?

[PColumbus73]

US 501 becomes an expressway-grade roadway from here to the Intracoastal Waterway bridge. If this interchange were to be rebuilt, then free-flow on the main line road should be maintained.

Anyone who lives here would agree that adding more traffic lights to US 501 is a bad idea.

[vtk]

https://maps.google.com/maps?ll=39.045969,-82.613668&spn=0.010849,0.01929&t=h&z=16

Fixed for you. Please remove your search results from the map before you grab the link for sharing; under some conditions (such as, attempting to view the map on a smartphone), the search query (in this case Jackson, Ohio) will override the specific map view you intended to share.

[Brandon]

Why wouldn't a cloverleaf with C/D lanes have worked?

Check it - this design has larger loop radii than a cloverleaf would allow in this space. How about a SPUI?

Been there, done that.  Not so sure it's a great idea.  Because I-94/Telegraph.

[tradephoric]

This interchange at I-95 & Hwy 20 outside Boston looks similar to the original post.  Would this be a windmill interchange?  There are no flyover ramps at this interchange.

https://www.google.com/maps/@42.3705511,-71.2699962,647m/data=!3m1!1e3

[pumpkineater2]

Could the interchange of Interstates 40 and 27 in Amarillo be considered a windmill interchange?
Note that the eastbound I-40 to southbound I-27 ramp doesn't directly connect to I-27- traffic must first travel through a signalized intersection before merging onto I-27 via a slip ramp.

https://goo.gl/maps/et6cJQCFccL2

[tradephoric]

This interchange at I-95 & Hwy 20 outside Boston looks similar to the original post.  Would this be a windmill interchange?  There are no flyover ramps at this interchange.

https://www.google.com/maps/@42.3705511,-71.2699962,647m/data=!3m1!1e3

Here's a similar interchange on I-95.  It has a massive footprint but it's another example of a free-flowing freeway-to-arterial interchange.

https://www.google.com/maps/@42.5936156,-70.9623734,1821m/data=!3m1!1e3 

[mvak36]

Could the interchange of Interstates 40 and 27 in Amarillo be considered a windmill interchange?
Note that the eastbound I-40 to southbound I-27 ramp doesn't directly connect to I-27- traffic must first travel through a signalized intersection before merging onto I-27 via a slip ramp.

https://goo.gl/maps/et6cJQCFccL2

It kinda looks like a turbine interchange. Not sure about that though.

[paulthemapguy]

Could the interchange of Interstates 40 and 27 in Amarillo be considered a windmill interchange?
Note that the eastbound I-40 to southbound I-27 ramp doesn't directly connect to I-27- traffic must first travel through a signalized intersection before merging onto I-27 via a slip ramp.

https://goo.gl/maps/et6cJQCFccL2

It kinda looks like a turbine interchange. Not sure about that though.

I would definitely call it a turbine interchange.  Google "turbine interchange" and you get images like this:
https://www.google.com/search?q=turbine+interchange&espv=2&biw=1345&bih=606&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjXrO35iYjLAhUDez4KHUssA-oQsAQIGw

[mariethefoxy]

Is this something that exists, or is it something that you made up?

the interchange in Queens NY with I-295 (Clearview) and I-495 (Long Island Expressway) looks pretty much like that.