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Old November 2nd, 2016, 02:34 PM   #1
Ryme Intrinseca
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Stackabouts of the world, unite!

The three-level roundabout, or 'stackabout', is an interchange consisting of two mainlines with a large roundabout on a third level, which handles turning movements. It is very similar to a three-level diamond or 'volleyball' interchange, but uses a single large roundabout instead of a series of signalized intersections.

This design is most associated with the UK, which has 27 (one more under construction) by my count, but they are also used in many other countries. Some examples are below:

1. UK https://www.google.co.uk/maps/@52.86...-1.5682974,16z
2. Italy https://www.google.co.uk/maps/@41.01...14.1920659,16z
3. Belgium https://www.google.co.uk/maps/@50.9129315,4.3416906,16z
4. The Netherlands https://www.google.co.uk/maps/@52.3839117,4.7079124,16z
5. United States https://www.google.co.uk/maps/@29.97...90.1557191,16z
6. Spain https://www.google.co.uk/maps/@43.34474,-8.4149142,16z
7. France https://www.google.co.uk/maps/@47.49...-0.6219888,16z
8. Czech Republic https://www.google.co.uk/maps/@49.80...18.2066546,16z
9. Austria https://www.google.co.uk/maps/@47.33...15.0103295,16z
10. Qatar https://www.google.co.uk/maps/@25.26...51.4972768,16z
11. China https://www.google.co.uk/maps/@30.72...04.0479054,16z
12. Norway https://www.google.co.uk/maps/@59.937298,10.7847502,16z
13. Malaysia https://www.google.co.uk/maps/@5.399...00.4065677,16z
14. Latvia https://www.google.com/maps/@56.9306751,24.1818629,16z
15. Lithuania https://www.google.com/maps/@54.6690071,25.2383098,16z
16. Greece https://www.google.co.uk/maps/@38.04...23.8042421,16z
17. Slovakia https://www.google.co.uk/maps/@48.14...17.1519347,16z
18. Ukraine https://www.google.co.uk/maps/@50.42...30.5684946,16z
19. Kuwait https://www.google.co.uk/maps/@29.34...47.9457593,16z (shown under construction but since opened)
(20. Ireland - under construction)
(21. Sweden - under construction)

Do you know of any other countries that uses this design?
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Old November 2nd, 2016, 04:30 PM   #2
patakcze
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Some more in the Czech Republic:
https://goo.gl/maps/bpet4y9ZveT2 finished, but not in use yet
https://goo.gl/maps/SoqaPsmfNCr
https://goo.gl/maps/cvjCMaZFzuJ2
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Old November 2nd, 2016, 04:33 PM   #3
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Does this count? https://www.google.pl/maps/@50.08725.../data=!3m1!1e3
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Old November 2nd, 2016, 04:45 PM   #4
Ryme Intrinseca
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Quote:
Originally Posted by Kemo View Post
I'd say it's more like a three-level diamond.
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Old November 2nd, 2016, 05:02 PM   #5
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A-66/EX-A1 interchange in Spain:
https://www.google.co.uk/maps/@39.98.../data=!3m1!1e3
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Old November 2nd, 2016, 07:38 PM   #6
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I/C between SS13 and RA16/SR177 near Pordenone, Italy
https://www.google.it/maps/@45.9460813,12.7202797,18z
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In real life, electronic toll collection was first introduced in Bergen, Norway in 1986, and well into the 21th century many countries still struggle to implement it.
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Old November 2nd, 2016, 10:56 PM   #7
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Does this count ?
https://goo.gl/maps/RRB8dDJ11zE2
Bulgaria
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Old November 2nd, 2016, 11:18 PM   #8
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Believe it or not. This one is from USA (if it counts):
https://www.google.com/maps/@38.8990...!3m1!1e3?hl=en

and one more:
https://www.google.com/maps/@38.9024...!3m1!1e3?hl=en
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Old November 2nd, 2016, 11:48 PM   #9
Ryme Intrinseca
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Looks like those Bulgarian and American examples are only on two levels, though there is a US three-level roubdabout in the OP.
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Old November 3rd, 2016, 12:06 AM   #10
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The Bulgarian example seems to be on three levels.
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Old November 3rd, 2016, 01:53 AM   #11
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Quote:
Originally Posted by rakcancer View Post
Believe it or not. This one is from USA (if it counts):
Washington DC is a really strange place to drive. If you are driving and the car is moving, you're probably going in a circle, loop, roundabout, ellipsoidal road of any forms
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Old November 3rd, 2016, 03:39 AM   #12
Ryme Intrinseca
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Quote:
Originally Posted by Verso View Post
The Bulgarian example seems to be on three levels.
It looks like three levels but if you zoom in you can see it's actually two - one of the 'levels' is actually just a cut through at the same level as the roundabout (presumably signalized). At least according to Google's mapping, anyway.

Last edited by Ryme Intrinseca; November 3rd, 2016 at 03:45 AM.
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Old November 3rd, 2016, 10:39 AM   #13
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According to Google's mapping it may look like even one level.
Here's short video, that shows it's three level.

And one picture :

Level "-1" is N-NE -> S-SW; the roundabout is on level "0", level "+1" is NW-SE.

One more better video (start watching from 1:09) :








First one minute
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Old November 3rd, 2016, 12:17 PM   #14
Ryme Intrinseca
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Looks like we have

22. Bulgaria

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Old November 3rd, 2016, 01:39 PM   #15
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Where do we draw the line between a signalized stackabout and a three level diamond? Numerous more world examples can be drawn if we do not exclude the latter.
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Old November 3rd, 2016, 03:16 PM   #16
Ryme Intrinseca
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Quote:
Originally Posted by Exethalion View Post
Where do we draw the line between a signalized stackabout and a three level diamond? Numerous more world examples can be drawn if we do not exclude the latter.
It's a good question. I think intuitively there is a difference, which comes down to a variety of factors:

1) Stackabout geometry is typically circular or oval shaped rather than square or rectangular.
2) Stackabouts typically separate entry and exit points from each other, whereas a three-level diamond typically has entry and exit points meeting each other at four-way intersections.
3) Stackabouts are typically designed without signals (even if they are added later).

Of course, there are borderline cases, like the example in Bratislava, which you could argue is both a stackabout and three-level diamond! https://www.google.co.uk/maps/@48.14...17.1515485,18z
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Old November 3rd, 2016, 03:32 PM   #17
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Bratislava ring road is quite the exciting stretch of motorway it seems. I like the 450 degree exit ramp a few miles to the north east of the stackabout-diamond.
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Old November 3rd, 2016, 07:57 PM   #18
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Russia, near Moscow
https://www.google.ru/maps/@55.66090.../data=!3m1!1e3
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Как только проедят напечатанные амерами баблосы, нефтя будет падвацать, хас папиисяд, а толяр - пасто диривянных. И ражко сразу развалиццо. Патаму шо она сичаз разваливаиццо, хотя нефтя ещё не падвацать

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Old November 3rd, 2016, 09:20 PM   #19
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What about this 6-way Stackabout with extra fly-overs in the Netherlands?
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Old November 4th, 2016, 12:31 AM   #20
Ryme Intrinseca
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Knooppunt Kleinpolderplein is more like a five-level roundabout
Quote:
Originally Posted by dars-dm View Post
And we have:

23. Russia
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