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Old April 27th, 2008, 11:12 PM   #601
Tom 958
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Quote:
Originally Posted by Realek View Post
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???

1. Left entrances and exits

2. Two dangerous reverse curves on the mainline in every direction, unless the mainline itself curves through the interchange, in which case the curves on one of the roadways get sharper.

3. Steep grades due to having over- and underpasses too close together.

There are two of these that I know about, both in the US (isn't there another in Saudi Arabia?). I'm too lazy to post pics, but here are the Google Map links:

I-65 at I-20/59, Birmingham, http://www.google.com/maphp?hl=en&q=...01914&t=k&z=15

and I-95 at I-695, Baltimore, http://www.google.com/maphp?hl=en&q=...01914&t=k&z=15
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Old April 28th, 2008, 01:36 AM   #602
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Quote:
Originally Posted by Chriszwolle View Post
However, they are better than cloverleafs. I have never seen 2 lane cloverleafs (the 270 degrees turns) in the Netherlands.
do you mean one leaf or all 4 leafs?
here are some german ones:

here we have one "ear" with two lanes (north>east), well, it's a modified cloverleaf though


here all 4 ears begin with 2 lanes, but the left lanes disappear before reaching the collector lanes


here same as above, but only 2 ears (west>north, north>east)


the first one i found where 2 lanes reach the collector lane (east>south), but the oncoming traffic from north into the collector lanes has no lane going through

Last edited by Patrick; April 28th, 2008 at 02:30 AM.
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Old April 28th, 2008, 01:43 AM   #603
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Quote:
Originally Posted by Realek View Post
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???


i like it, too you may think you're in england when you're in the middle of it

this one also has curves in the main direction:
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Old April 28th, 2008, 01:05 PM   #604
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Quote:
Originally Posted by Chriszwolle View Post
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.

interesting classification...

could you assign concrete numbers to these "low, medium, high" categories?
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Old April 28th, 2008, 05:23 PM   #605
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Quote:
Originally Posted by Realek View Post
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
Exiting on the left IS a bit problem, in my view.
In Australia, they have quite a few exit/ entrances on the right (outside lane)(fast lane)(We drive on the left). It is a terrible compromise. Here they also often have the left lane (L1, inside lane) as the lane that ends if 3 lanes are merging into 2. The Law here also makes no distinction between L1 and L2, making it only illegal to drive in the right lane when not overtaking. Comparing this to Europe where L1 is the only legal lane unless overtaking. The differnce is massive in experience and fustration levles. The European model works so much better.
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Old April 28th, 2008, 05:28 PM   #606
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Quote:
Originally Posted by H123Laci View Post
interesting classification...

could you assign concrete numbers to these "low, medium, high" categories?
> Simple cloverleaf
AADT up to 30,000

> Cloverleaf with collector lanes
AADT up to 80,000

> Turbine
AADT up to infinity, lots of exiting traffic

> Stackt
AADT up to infinity, infinitive number of exiting traffic.
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Old April 28th, 2008, 06:48 PM   #607
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Quote:
Originally Posted by Chriszwolle View Post
> Simple cloverleaf
AADT up to 30,000

> Cloverleaf with collector lanes
AADT up to 80,000
thanx.

I hate I am always right.

(we are building a very busy motorway(M6) - aadt will be about 5.000 (yes: FIVE thousand) and we are building the M6xM9 cloverleaf IC with CD lanes.
the aadt of M9 is about 4.000...

and there is another cloverleaf: the M6xM8 interchange.
it is also a FULL cloverleaf w C/D lanes, but the M8 terminates at the M6, so it funtions only as a trumphet...

it is nice, isn't it? )
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Old April 28th, 2008, 06:53 PM   #608
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Well, CD lanes are also safer. If a government opts to lower the traffic accidents, CD lanes are also a way to do that. And don't forget, the Netherlands also used to have very quiet motorways, however that's all changed now. Maybe it'll happen in Hungary too.
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Old April 28th, 2008, 07:19 PM   #609
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Quote:
Originally Posted by Chriszwolle View Post
Well, CD lanes are also safer. If a government opts to lower the traffic accidents, CD lanes are also a way to do that.
that's ok.

the problem is, that we have many poor quality 2lane roads with aadt of 20.000 or more, and we have many p.q. 2 lane roads with aadt of 10.000 or more crossing towns and villages...
but we have not enough money...

so if we want to improve safety (and decrease accident rate) we shouldn't spend the money for outsized motorway interchanges (and outsized motorways...), but we should spend for bypasses and main road improvements...
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Old April 28th, 2008, 09:19 PM   #610
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omg, before the frankfurter kreuz has been modified some in 2000, it was a simple cloverleaf with collector lanes, and with an aadt of around 300000 (now 310000)
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Old April 28th, 2008, 09:23 PM   #611
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Yeah right... There is no such road with an AADT of 300,000 in Germany. Above 100,000 is already an exception. Unless you mean total AADT of all directions combined.
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Old April 28th, 2008, 09:26 PM   #612
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A3: F-Flughafen - Frankfurter Kreuz 123,800
A3: Frankfurter Kreuz - F-Süd 127,000
A5: F-Niederrad - Frankfurter Kreuz 144,900
A5: Frankfurter Kreuz - Zeppelinheim 150,700

total divided by 2: 273,200 vehicles a day on the Frankfurter Kreuz.

However, it's also important how many vehicles actually use the exits, i think it's quite low for the traffic volumes, since there are alternatives nearby. (A66, A67, A661).
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Old April 28th, 2008, 09:32 PM   #613
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ok, i see, to reach that high number the statistic includes the exit to the B43 (it is integrated in the collector lanes on the A5)
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Old May 10th, 2008, 06:24 AM   #614
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Busiest interchange in your metro

According to official statistics, what interchange in your metro area has the highest traffic count?

In the St Louis metro, it's the I-70/I-270 interchange, northwest of the city.
Per MoDot's website, it's also the busiest interchange in the state of Missouri. The total daily traffic count averages 290,000.
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Old May 10th, 2008, 06:42 AM   #615
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Canada - Toronto - Hwy-401 - Weston Rd.-Hwy-400 (Toronto-West)
Annual Average Daily Traffic (AADT) of over 425,000 in 2004
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Old May 10th, 2008, 06:45 AM   #616
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according to wikipedia its the east los angeles interchange wit 430,000 cars per day, but the 405/101 or the 405/10 interchanges are the ones that give me the most grief.
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Old May 10th, 2008, 07:18 AM   #617
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Causeway and I-10 In Metairie just to the west of New Orleans. Northshore traffic merges with I-10 toward the CBD here. According to the DOTD in 2005there were 134,567 cars passing through on an average day.

Here's a shot where southbound Causeway merges with westbound I-10.

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Old May 10th, 2008, 09:45 AM   #618
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I have no idea (I live just south of Amsterdam). Maybe A2/A10. Perhaps Chris knows.
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Old May 10th, 2008, 11:40 AM   #619
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I don't know if topic starter meant AADT volume near an interchange, or the actual AADT on interchanges, like count all directions, and divide by 2.
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Old May 10th, 2008, 06:37 PM   #620
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70,000 AADT here.
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