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Old December 26th, 2008, 10:30 PM   #841
jumoni
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Quote:
Originally Posted by Paddington View Post
They spent a few dollars on this one:






Was this really necessary..????
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Old December 27th, 2008, 04:34 AM   #842
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Where's the location???

California???

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Old December 27th, 2008, 05:12 AM   #843
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Originally Posted by fetg_ View Post
Really? I compared the diameter of some trumpets and CLs and found out that the loops diameter is pretty much similar. Point is that traffic do the same 270 degree turn in both loops.

Well you're right that it's no good idea to build a cloverleaf in areas where land is expensive. But stack interchanges consumes a lot space too, if not more. The best alternative for inner-cities is British roundabout interchanges. They are small, can handle more traffic than SPUIs and does not require any traffic lights.


I can't see any advantage for Parclos, other than that it's cheaper to build and that it's eliminating weaving. However, is weaving really that big issue? How can replacing weaving with putting two traffic lights in the interchange be any good. Can someone explain that? Is there some study that has compared CLs with Parclos?
Parclo's are an Ontario Invention..developed by the Ministry of Transportation of Ontario. Therefore, they're something the MTO takes pride in.

I don't mind them at all. They're efficient overall. Sure there are two additional traffic lights, but due to their close proximity to eachother, they can be worked in a way where signal timing plans can be made where a vehicle will only have to stop at one intersection.

Roundabouts, I think there are maybe 3-4 left in Ontario. They're being removed ASAP. However, they're fun. Taking my friends around the loop ramps when they have NO clue of what is going on creates some laughs and good memories. Although by loop #2 or 3 they're figuring it out and getting annoyed. haha.

Still one just outside of London, Ontario. It will likely be removed/replaced in the next five years.
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Old December 27th, 2008, 06:11 AM   #844
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The Canadians invented something?
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Old December 27th, 2008, 06:27 AM   #845
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Quote:
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The Canadians invented something?
http://en.wikipedia.org/wiki/Parclo
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Old December 27th, 2008, 09:30 AM   #846
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Quote:
Originally Posted by Nikkodemo View Post
Where's the location???

California???


I believe that's the 105/110 interchange in Los Angeles, CA.
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Old December 28th, 2008, 02:19 AM   #847
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Quite messy interchange.
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Old December 28th, 2008, 03:22 AM   #848
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Quote:
Originally Posted by Verso View Post
Quite messy interchange.
Eww. Though the terrain view shows that it's built on quite a steep slope, so I'm guessing all the twists are needed.
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Old December 30th, 2008, 01:34 AM   #849
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Some interesting pics HERE.
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Old December 30th, 2008, 02:21 AM   #850
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Quote:
Originally Posted by ChrisZwolle View Post
how do you call an interchange between Freeways? Intersection? Junction?
Interchange.
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Old December 30th, 2008, 02:26 AM   #851
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Quote:
Originally Posted by jumoni View Post



Was this really necessary..????
Yes. The traffic on LA freeways is so high that such interchanges are needed to avoid perpetual gridlock.
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Old December 30th, 2008, 11:21 PM   #852
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Some interesting interchanges near me:


Overview photos:
















Close-up photos:

Approaching the mammoth:


Overlooking a stack:


A neat look under a cloverstack:


The belly of the beast:


4 levels:

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Old December 31st, 2008, 03:38 AM   #853
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One of the cheapest (and worst) interchanges I know, is in Salamanca, where the A-66 meets the A-62, on the west part of the city

http://maps.google.es/?ie=UTF8&ll=40...19312&t=h&z=16

what is worst is that on the other side of the motorway, on the north of the city is a regular interchange:

http://maps.google.es/?ie=UTF8&ll=40...19312&t=h&z=16
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Old December 31st, 2008, 07:00 AM   #854
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An example of a Stack in Caracas:



And a cloverstack?? ()

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Old January 3rd, 2009, 11:34 PM   #855
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Interesting interchange in Bronx, NYC area (I-95/I-296/I-678). Elements of turbine and cloverleaf plus direct ramps of I-295 merging from SE. Not all directions are available though, some direct ramps are missing.

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Old January 3rd, 2009, 11:39 PM   #856
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That's the Bruckner Interchange. The Hutchinson River Parkway also starts here to the north, besides the roads you've mentioned.

The problem with this kind of interchanges is that their geometry is outdated and often cause congestion while the lane capacity itself is okay. The same happens further west with the I-95 interchanges with the I-87/Harlem River Drive and Henry Hudson Parkway.
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Old January 5th, 2009, 11:27 AM   #857
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Here's a clever cloverstack junction in the UK. It is completely free flowing, yet only costs 3 quite small bridges. (plenty of space though). This must be a VERY cost effective junction.


Last edited by scotdaliney; January 6th, 2009 at 09:23 AM.
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Old January 5th, 2009, 08:26 PM   #858
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Not really a stack actually because the sliproad goes around the center instead of over, or under, it.
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Old January 5th, 2009, 08:32 PM   #859
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I'm not sure how this one's called though. There are a few of them in the UK.
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Old January 6th, 2009, 09:13 AM   #860
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Quote:
Originally Posted by ChrisZwolle View Post
I'm not sure how this one's called though. There are a few of them in the UK.
They would seem to be cheaper or close to it to build than those terrible 3 level roundabout interchanges they insist on punishing us with. With much better capcity.

Last edited by scotdaliney; January 6th, 2009 at 09:18 AM.
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