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Old April 24th, 2008, 09:11 PM   #581
Patrick
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trumpet-in-trumpet near Trier, A1 north (to Koblenz), A1 south (to Saarbrücken), A602 west (to Trier), L145 east (to nearby villages)

Last edited by Patrick; April 24th, 2008 at 11:22 PM.
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Old April 24th, 2008, 11:03 PM   #582
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That's funny, comming from the east goingt to north you make a 450° turn.
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Old April 24th, 2008, 11:33 PM   #583
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Quote:
Originally Posted by The Knowledgeable View Post

And this is... I'm not sure how to call it. Instead of one single half stack, they've built three forks (is this how they're called?) that form a triangle over approx. 22 sq km. If this could be considered one interchange, it's the largest I've seen. E45 and E20 near Kolding, Denmark.
http://img206.imageshack.us/img206/3...rchangere0.jpg
maybe we can call this a pure triangle

we have a similiar thing in Germany, but smaller of course
(A5 west to Frankfurt, A7 south to Würzburg, A7 east to Hannover/Dresden)



@ earthjoker:
lol, i have never seen it like that (or noticed, maybe the right word is missing; so habe ich es noch nie betrachtet)
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Old April 25th, 2008, 10:13 AM   #584
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Because Right is Right!
Hahaha i dont think i can match upto that one
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Old April 25th, 2008, 04:30 PM   #585
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Turbine in the UK
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Old April 25th, 2008, 08:04 PM   #586
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wow, almost perfect symmetry
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Old April 26th, 2008, 01:53 PM   #587
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How about this one; Kunderberg, (A79xA76) the most incomplete junction in NL:



It used to be even more incomplete in the past, the cloverleaf was added much later.
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Old April 26th, 2008, 02:10 PM   #588
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Is it supposed to prevent some traffic flows on purpose, or the connections are not really needed because of other junctions close by?
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Old April 27th, 2008, 02:11 PM   #589
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Quote:
Originally Posted by Patrick View Post
wow, almost perfect symmetry
Yes exactly, For a road junction it looks almost pretty. I'm not sure which has most capacity, stacks or turbines, but turbines look so much better.
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Old April 27th, 2008, 02:39 PM   #590
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Stacks have a better capacity, since you can put even like 3 lanes on connector roads, which isn't preferable on turbines.

Some stack interchanges actually consume less space than a normal sized cloverleaf with distributor lanes.
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Old April 27th, 2008, 03:07 PM   #591
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Quote:
Originally Posted by Chriszwolle View Post
Stacks have a better capacity, since you can put even like 3 lanes on connector roads, which isn't preferable on turbines.
What is the reason for this?
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Old April 27th, 2008, 03:32 PM   #592
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Because of the tighter curves, 3 lanes next to eachother can more easily cause accidents of people who drive too fast and get out of their lane unwanted.

However, they are better than cloverleafs. I have never seen 2 lane cloverleafs (the 270 degrees turns) in the Netherlands.
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Old April 27th, 2008, 05:41 PM   #593
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Beautiful concept. You get all the real benefits of a stack, for a significantly lower price probably. Why the hell aren't there tons of these???

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Old April 27th, 2008, 06:18 PM   #594
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If there's a tunnel on the W-E axis, it is not that cheaper.
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Old April 27th, 2008, 06:23 PM   #595
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Quote:
Originally Posted by Majestic View Post
If there's a tunnel on the W-E axis, it is not that cheaper.
There's no need for a tunnel, it's basically 2-level (as opposed to a stack which is 4-level).
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Old April 27th, 2008, 06:27 PM   #596
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It goes about this:

low AADT, low number of exiting vehicles
> Simple cloverleaf

medium AADT, high number of exiting vehicles
> Cloverleaf with collector lanes

high AADT, medium number of exiting vehicles
> Turbine

high AADT, high number of exiting vehicles
> Stack

Ofcourse, there are various variants of interchanges.
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Old April 27th, 2008, 06:58 PM   #597
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Quote:
Originally Posted by Realek View Post
There's no need for a tunnel, it's basically 2-level (as opposed to a stack which is 4-level).
But if N-S is level 1, W-E is level 2, then flyovers must be levels 3&4. I can't see other way...
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Old April 27th, 2008, 07:08 PM   #598
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Quote:
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But if N-S is level 1, W-E is level 2, then flyovers must be levels 3&4. I can't see other way...
But they don't meet at a same area, so no need for 4 levels. If you have enough space, you can make this interchange both 2-level and with pleasant gradients. True, you need a lot of space if you want to make it really smooth, but the same goes for a stack, and the stack is still a 4-level interchange.

There are two minor disadvantages in this interchange, but they are totally not important IMO:
-left exits
-slightly longer distance when driving straight
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Old April 27th, 2008, 07:34 PM   #599
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This project is very interesting indeed. My bad I haven't noticed that whole interchange consists of exits at the first look. The good thing is that all directions are equal here, no matter where you go, you may enter the intersection at the same speed. The problem, apart from space needed is that you might need to switch lanes a couple of times and it could be easy to miss your exit. But after all, I like it a lot. Have you ever seen that kind of interchange in reality?
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Old April 27th, 2008, 07:42 PM   #600
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I remember coming across a single interchange like this on the net. I'm too lazy too search for it now though... I don't know if there are others, I certainly hope so.
BTW, I think the problem you mention is not really a problem - with good signalization you will always know in advance which lane to stick to, and that pretty much goes for all the interchanges.
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