Hi bubbac2005,
Just as an FYI, I made a video recently comparing the performance of a bunch of 8-way intersections and this was one of the ones I looked at, you can see it here if you're interested:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2246718617
thanks

Wow, looks similar to one I just got through making. Only mine just has 4 highways and is about 5 times more complex; interchanges are spiraling all around and through it, the highways themselves really don't have but one or two very specific points they can come out of "The Behemoth" as it's called, and the whole thing is one massive piece of intimidation to even an Atlanta or Chicago driver. xD