I know I am a few years late, but I found a good example in Charlotte, NC.

https://www.google.com/maps/@35.3488092,-80.734344,16.04z

If you go a little further northeast along I-485, you can find that the next interchange is a diverging diamond interchange and a little further is a dumbbell interchange.

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On Wednesday, August 29, 2018 at 7:47:52 PM UTC-4, bluehedgeho...@gmail.com wrote:

I know I am a few years late, but I found a good example in Charlotte, NC.

https://www.google.com/maps/@35.3488092,-80.734344,16.04z

That's a turbine/whirlpool.

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On Friday, January 13, 2012 at 9:22:24 AM UTC-7, Aušrius (Emilijos tėtis) wrote:

I still haven't heard of any real-life examples that achieve this functionality (no conflicts and no weaving) with only four bridges,
but I also can't believe it hasn't been done somewhere, perhaps with different (or irregular) geometry.

Elmer

Hej, Elmer!

Amazingly, Pinavia is not the end of the story yet.
See this picture: http://i814.photobucket.com/albums/zz66/suaua/pinavia_4into3.jpg
(right turns have been omitted - they are trivial).

It shows you can make a junction having the functionality you
mentioned with just THREE bridges. Can you make it with just two??

Since a cloverleaf interchange has only one bridge, the great achievements of the Pinavia interchange (at the cost of three additional bridges) seem to be a) lower land cost due to the usable center and b) higher speed.

I would be curious to see an analysis of this "pinavia 4 into 3" vs. a cloverleaf to understand what it achieves at the cost of 2 additional bridges.

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