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Old January 6th, 2009, 09:15 AM   #861
ChrisZwolle
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We have one of them in the Netherlands too. The idea is okay as long as there are not a lot of 3/4th turns on the interchange.
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Old January 6th, 2009, 09:22 AM   #862
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Quote:
Originally Posted by ChrisZwolle View Post
We have one of them in the Netherlands too. The idea is okay as long as there are not a lot of 3/4th turns on the interchange.
Which one do you mean the roundabout or cloverwhatever.
If roundabout, The government seems bend on making them even worse by putting lights on them, so you end up with traffic lights on a motorway to motorway interchange.
edit: closer reading you must mean roundabout
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Old January 6th, 2009, 09:27 AM   #863
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The roundabout. The through lanes are grade separated, but if you want to change motorways, you'll need to take the roundabout.

A right turn on such interchanges is no problem, since you mostly do not get onto the roundabout itself. But left turns, (three quarters round) are often problematic. This also translates to regular small roundabouts. The Dutch CROW road engineering publicist recommends to build a regular intersection (with or without traffic lights) if there are a lot of left turns (in Britain: right turns!) on roundabouts.
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Old January 6th, 2009, 09:30 AM   #864
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or
With traffic lights
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Old January 7th, 2009, 01:09 PM   #865
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I hate those bloody things.

Imagine having a house right beside it... the noise would drive you crazy.
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Old January 7th, 2009, 02:11 PM   #866
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I hate those bloody things.

Imagine having a house right beside it... the noise would drive you crazy.
Most motorways/ freeways have noise walls, personally I think a standard traffic light intersection would be noisier. All the trucks starting from 0, and no barriers.
If the roundabout doesn't have lights, at night it should be relately quiet, well as quiet as a motorway can be anyway.
I live about 400mtrs from a freeway an can honestly say I barely here it. The standard traffic lights in the other direction though, (same distance) can sometimes be loud.
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Old January 7th, 2009, 02:17 PM   #867
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Well, the interchange shown has the high speed lanes on the highest level, which means noise barriers don't work that well.
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Old January 7th, 2009, 09:54 PM   #868
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Mexico can be a great space saver when it comes to building highway junctions. Unfortunately that makes no good to high speeds:

Trumpet in Tijuana

[IMG]http://i39.************/37l36.jpg[/IMG]

Roundabout in Monterrey

[IMG]http://i40.************/2z49r1g.jpg[/IMG]

Diamond? in Monterrey

[IMG]http://i40.************/2rwxr9s.jpg[/IMG]

In San Luis Potosi

[IMG]http://i44.************/20us5jd.jpg[/IMG]

Cloverleaf in Mexico City

[IMG]http://i42.************/2rxcg04.jpg[/IMG]
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Old January 7th, 2009, 09:57 PM   #869
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[img]http://i40.************/2z49r1g.jpg[/img]

They should make way more of these in the Netherlands. It can seriously increase the quality of the traffic flow, while it doesn't use a lot of space, and it's also below grade, so less noise.
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Old January 7th, 2009, 10:16 PM   #870
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Here's one that's always interested me - the intersection of the N2 and R300 (soon to be renumbered N21) freeways in Cape Town, South Africa:

http://maps.google.com.au/?ie=UTF8&l...23754&t=k&z=16

It's some sort of hybrid between a stack, a turbine and a cloverleaf, I think.

Also, I wonder if anyone here can identify which type of interchange this one is (N1/M5 interchange in Cape Town).

http://maps.google.com.au/?ie=UTF8&l...23754&t=k&z=16

Looks to me like half a trumpet, plus an extremely odd stack/turbine/windmill/cloverleaf hybrid.
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Old January 7th, 2009, 10:25 PM   #871
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Quote:
Originally Posted by ChrisZwolle View Post
[img]http://i40.************/2z49r1g.jpg[/img]

They should make way more of these in the Netherlands. It can seriously increase the quality of the traffic flow, while it doesn't use a lot of space, and it's also below grade, so less noise.
Yeah, I would LOVE more of those tunnels in Poland, especially on most major lights-controlled roundabouts. They don't disintegrate the surroundings as much as those bulky estacades/viaducts.
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Old January 8th, 2009, 09:22 AM   #872
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Quote:
Originally Posted by Robosteve View Post
Also, I wonder if anyone here can identify which type of interchange this one is (N1/M5 interchange in Cape Town).

http://maps.google.com.au/?ie=UTF8&l...23754&t=k&z=16

Looks to me like half a trumpet, plus an extremely odd stack/turbine/windmill/cloverleaf hybrid.
That's the Koeberg interchange - having driven through that one numerous times, words that I can use to describe it are along the lines of "dumb" and "bloody mess". The design of that interchange leads to serious congestion.

Fortunately, it's currently getting a total makeover. Check this thread in the South Africa forum for all the details (although most of it deals with the Hospital Bend upgrade - which is another nasty bit of freeway, and I'm glad that's being sorted out too - there's some bit of stuff about the Koeberg interchange upgrade as well).
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Old January 9th, 2009, 11:05 PM   #873
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These are some of other "Space Saver" Interchanges in Mexico.
Personally, I don't like this kind of junctions in busy Motorways due to the inneficiency function that they do in that cases, but I don't know why they are constantly built in here. You may find them very weird.

Mexico City


Saltillo


Monterrey
My city has some kind of weird Interchanges, of course Space Savers.






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Old January 10th, 2009, 02:18 PM   #874
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near Springfield:

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Old January 10th, 2009, 02:24 PM   #875
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Which one? There are 34 Springfields in the USA. But I guess this is the one in Virginia.
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Old January 10th, 2009, 03:33 PM   #876
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List of stack interchanges in Europe

I want to compile a list of four-level symmetrical stacks that are existing (or in construction) in Europe. These seem to be pretty rare here.
http://en.wikipedia.org/wiki/Stack_interchange
Interesting to know also: where is the easternmost stack?
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Old January 10th, 2009, 03:39 PM   #877
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The Netherlands:

Interchange Prins Clausplein, A4/A12 near The Hague (Den Haag)
[IMG]http://i39.************/2i8evf5.jpg[/IMG]

Interchange Ridderkerk, A15/A16 near Rotterdam
[IMG]http://i41.************/2qwg4s6.jpg[/IMG]

unfinished:

Interchange Benelux, A4/A15 near Rotterdam
[IMG]http://i42.************/jf9naw.jpg[/IMG]
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Old January 10th, 2009, 03:51 PM   #878
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Thx Chris. I'm trying to make a list of four-level symmetrical stacks only.
The second is not symmetrical (although is a four level thing).
As for the third, unless A4 will be extended south of A15 (going where?), this won't be a four-level symmetrical stacks.
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Old January 10th, 2009, 04:10 PM   #879
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No , its the one near Washington
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Old January 10th, 2009, 04:22 PM   #880
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I guess you won't find many symetrical Texas-style stacks in Europe. Here's quite symetrical 4-level stack.

A-1/M-40 in Madrid:


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