Turbines and Windmills: A New Typology

[jackal]

Following discussion in this thread, I think there's really five main types in this interchange family rather than the usually recognized two (turbine and windmill). Here are the five with some UK and overseas examples:

1. Whirlpool - slips are cyclic, smooth and somewhat spaced out.

Thorpe: https://www.google.co.uk/maps/@51.39840 ... 372867,15z
Tampa: https://www.google.co.uk/maps/@28.00119 ... 261824,15z
Jacksonville: https://www.google.co.uk/maps/@30.25035 ... 164278,15z
Charlotte: https://www.google.co.uk/maps/@35.34817 ... 343214,15z
Lummen: https://www.google.co.uk/maps/@50.998916,5.2240069,15z
Naples: https://www.google.co.uk/maps/@40.8669906,14.320938,15z
Brussels 1: https://www.google.co.uk/maps/@50.8683697,4.4690596,15z
Brussels 2: https://www.google.co.uk/maps/@50.8914382,4.456266,15z
Madrid 1: https://www.google.co.uk/maps/@40.40121 ... 734124,15z
Madrid 2: https://www.google.co.uk/maps/@40.41214 ... 192193,15z
Madrid 3 (loops for service roads excluded): https://www.google.co.uk/maps/@40.36016 ... 639791,15z

2. Circle - cyclic slips packed into a circle.

Albany, NY: https://www.google.com/maps/@42.6432585,-73.7510512,15z
Namur: https://www.google.com/maps/@50.5178621,4.8820169,15z
Dubai: https://www.google.com/maps/@25.0550735,55.2492129,15z

3. Asymmetric - slips do not follow a clear pattern like the Whirlpool or Circle. Though still largely cyclic and smooth the slips are at varying distances from the centre of the interchange and often on three levels.

Sacramento 1: https://www.google.co.uk/maps/@38.56708 ... 101144,15z
Sacramento 2: https://www.google.co.uk/maps/@38.55886 ... 735049,15z
Denver: https://www.google.co.uk/maps/@39.77898 ... 906943,15z
Las Vegas: https://www.google.co.uk/maps/@36.17323 ... 551467,15z
Venice: https://www.google.co.uk/maps/@45.53422 ... 790073,15z
Tivoli: https://www.google.co.uk/maps/@41.92700 ... 418943,15z

4. Cyclic - slips are cyclic but some tighten. This is the name used in DMRB for the design.

Amarillo: https://www.google.com/maps/@35.1921214 ... ,15z?hl=en
Ghent: https://www.google.com/maps/@51.0102349 ... ,15z?hl=en
Theydon: https://www.google.co.uk/maps/@51.6778475,0.1305837,15z
Wisley (unbuilt).

5. Windmill - some slips are less cyclic and tighter.

Worsley: https://www.google.co.uk/maps/@53.48760 ... 765459,15z
Hamilton: https://www.google.co.uk/maps/@55.77875 ... 229273,15z
Baton Rouge: https://www.google.co.uk/maps/@30.43941 ... 081257,15z
Wichita: https://www.google.co.uk/maps/@37.67677 ... 127134,15z
New York City: https://www.google.co.uk/maps/@40.74378 ... 717326,15z
Detroit 1: https://www.google.com/maps/@42.3340926 ... ,15z?hl=en
Detroit 2: https://www.google.co.uk/maps/@42.34328 ... 440349,15z
Terni: https://www.google.com/maps/@42.5681969 ... ,15z?hl=en
Verona: https://www.google.co.uk/maps/@45.40560 ... 145166,15z
Stuttgart: https://www.google.co.uk/maps/@48.70618 ... ?entry=ttu
Dunfermline (incomplete), Handy Cross (unbuilt), Bickenhill (unbuilt).

Thoughts?

EDIT: I've now added all UK, US, and EU interchanges in the turbine and windmill family. Totals:
UK, 4; US, 14; EU, 14.

[wallmeerkat]

What would the likes of M2 NI Greencastle be classed as?

https://www.google.co.uk/maps/@54.64551 ... ?entry=ttu

[KeithW]

A19/A66 Middlesbrough, some of the curves are a bit tight as there was not a lot of space but it works pretty well.
https://www.google.com/maps/@54.5629439 ... &entry=ttu

The bowl of spaghetti that is downtown Columbus Ohio.
https://www.google.com/maps/place/Colum ... &entry=ttu

[AndyB]

What would the likes of M2 NI Greencastle be classed as?

https://www.google.co.uk/maps/@54.64551 ... ?entry=ttu

Octopus giving birth to the M5 because everything's all over the place?

[Chris5156]

What would the likes of M2 NI Greencastle be classed as?

https://www.google.co.uk/maps/@54.64551 ... ?entry=ttu

Well, none of the above, because it's not this kind of interchange! It's a unique layout so it's not classed as anything, but it has elements of several standard types within it.

A19/A66 Middlesbrough, some of the curves are a bit tight as there was not a lot of space but it works pretty well.
https://www.google.com/maps/@54.5629439 ... &entry=ttu

The bowl of spaghetti that is downtown Columbus Ohio.
https://www.google.com/maps/place/Colum ... &entry=ttu

Again, neither of these are whirlpools - the Middlesbrough one has one windmill/octopus type right turn but is otherwise a cloverstack.

[jackal]

^ Spot on, Chris.

[AndyB]

What would the likes of M2 NI Greencastle be classed as?

https://www.google.co.uk/maps/@54.64551 ... ?entry=ttu

Well, none of the above, because it's not this kind of interchange! It's a unique layout so it's not classed as anything, but it has elements of several standard types within it.

It’s two junctions - the simple M5 merge/demerge followed by the A2 roundabout with a fifth ramp (M2 NB->A2 NB) and two of the other ramps joining the roundabout from the inside.

[wallmeerkat]

What would the likes of M2 NI Greencastle be classed as?

https://www.google.co.uk/maps/@54.64551 ... ?entry=ttu

Well, none of the above, because it's not this kind of interchange! It's a unique layout so it's not classed as anything, but it has elements of several standard types within it.

It’s two junctions - the simple M5 merge/demerge followed by the A2 roundabout with a fifth ramp (M2 NB->A2 NB) and two of the other ramps joining the roundabout from the inside.

It is a kind of weird roundabout/gyratory with half the old village of Greencastle in it. I remember in the 80s it was laid out differently, at this point you had 2 lanes but there was a roundabout style give way marking to give way to the 2 lanes coming off the M2 to the right - https://www.google.com/maps/@54.6478533 ... ?entry=ttu

Then it was 3 lanes (almost reminiscent of an American speedway!) under the bridge, which then became 4 lanes with a lane gain from the right https://www.google.com/maps/@54.6452588 ... ?entry=ttu , then lane 4 dropped to turn right, lane 3 was a merge into the 2 lanes carrying on to the S4 Shore Road. The current hatch markings arrangement was late 90s/early 2000s.

[Owain]

Well, none of the above, because it's not this kind of interchange! It's a unique layout so it's not classed as anything, but it has elements of several standard types within it.

It’s two junctions - the simple M5 merge/demerge followed by the A2 roundabout with a fifth ramp (M2 NB->A2 NB) and two of the other ramps joining the roundabout from the inside.

It is a kind of weird roundabout/gyratory with half the old village of Greencastle in it. I remember in the 80s it was laid out differently, at this point you had 2 lanes but there was a roundabout style give way marking to give way to the 2 lanes coming off the M2 to the right - https://www.google.com/maps/@54.6478533 ... ?entry=ttu

Then it was 3 lanes (almost reminiscent of an American speedway!) under the bridge, which then became 4 lanes with a lane gain from the right https://www.google.com/maps/@54.6452588 ... ?entry=ttu , then lane 4 dropped to turn right, lane 3 was a merge into the 2 lanes carrying on to the S4 Shore Road. The current hatch markings arrangement was late 90s/early 2000s.

I remember using it only once - quite possibly on the day I met Andy at the nearby retail park - and I was impressed by it.

I'd driven through many times on the motorways' main lines, without realising that there was anything of that size hidden in the trees below.