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Old December 30th, 2007, 09:39 PM   #521
TheCat
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Ontario was the first to use parclo (partial cloverleaf) interchanges between motorways and main streets, but I think now they are the standard in many places around the world.
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Old December 31st, 2007, 07:43 PM   #522
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You forgot the roundabout interchange!


Essentially the same as any roundabout, only that one motorway is grade-separated from the roundabout and the intersecting motorway. This type is extremely common in the UK.
There is also an advanced variation of roundabout interchange, called three-level stacked interchange:


Where the two intersecting motorways as well as the roundabout itself are grade separated.

Both are considerably cheaper than their clover/stacked counterparts, however both have low capacity.


Lofthouse Interchange, Yorkshire, UK

http://maps.google.com/maps?q=Braint...&t=h&z=17&om=1
Pilgrims Hwy with Union St., Braintree, MA

http://maps.google.com/maps?q=Gardne...&t=h&z=18&om=1
MA Route 2 with Pearson Blvd., Gardner, MA
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Old December 31st, 2007, 09:48 PM   #523
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Here is a good page about different types of junctions:

http://www.cbrd.co.uk/reference/interchanges/

One of the only good things about the UK's motorway system is that we have never had any cloverleafs.
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Old December 31st, 2007, 11:21 PM   #524
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But you have traffic light-controlled roundabouts instead...
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Old January 1st, 2008, 11:49 AM   #525
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Quote:
Originally Posted by CborG View Post
1) Cloverleaf:

The cloverleaf is the most basic and cheapest to built because only one viaduct is required. Left turns are handled by loop ramps , Not suitable for busy crossings because the weaving lanes and tight corners reduce the road capacity. A half cloverleaf is used as a temporary solution when an extension of the connecting motorway is planned.
----------------
2) Trumpet:

Allways a 3-way junction. The left turns are handled by a loop ramp and a semi-directional ramp on the outside of the loop.
----------------
3) Star or Stack:

A star or stack is a four-way interchange in which left turns are handled by semi-directional flyover ramps which don't cross the center of the interchange.
These types lack weaving lanes and have higher entrance speeds so they can handle much more traffic than a cloverleaf.
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Don't forget countries where traffic drives on the left have motorways too...!
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Old January 1st, 2008, 09:01 PM   #526
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Quote:
Originally Posted by The Knowledgeable View Post
You forgot the roundabout interchange!


Essentially the same as any roundabout, only that one motorway is grade-separated from the roundabout and the intersecting motorway. This type is extremely common in the UK.
There is also an advanced variation of roundabout interchange, called three-level stacked interchange:


Where the two intersecting motorways as well as the roundabout itself are grade separated.

Both are considerably cheaper than their clover/stacked counterparts, however both have low capacity.


Lofthouse Interchange, Yorkshire, UK

http://maps.google.com/maps?q=Braint...&t=h&z=17&om=1
Pilgrims Hwy with Union St., Braintree, MA

http://maps.google.com/maps?q=Gardne...&t=h&z=18&om=1
MA Route 2 with Pearson Blvd., Gardner, MA
I like this a lot. It would also look nice if the roundabout thing was under the motorway and the motorway overpasses the roundabout.
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Old January 1st, 2008, 09:08 PM   #527
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Those roundabouts are outdated, and not suitable meeting todays traffic unless both motorways barely exchange traffic.

Though these solutions are fine for ordinary exits, but not for motorway-to-motorway interchanges.
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Old January 1st, 2008, 09:09 PM   #528
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Quote:
Originally Posted by Chriszwolle View Post
Those roundabouts are outdated, and not suitable meeting todays traffic unless both motorways barely exchange traffic.

Though these solutions are fine for ordinary exits, but not for motorway-to-motorway interchanges.
Ofcourse I was refering to ordinary extits.
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Old January 1st, 2008, 09:31 PM   #529
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roundabouts seem to be nice, but only for non congested exits. if this up would be congested exit/intersection, roundabout wouldn't be suitable because at the meeting point of exit ramp and roundabout speed drasticly falls and that would make waiting in a row at exit ramp. also, for motorway intersections they are totaly inappropriate. at medium and smaller exits they are very nice, but i guess in that case it is cheaper to make ordinary exit that roundabout. but they are nice indeed.
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Old January 1st, 2008, 09:40 PM   #530
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The busiest interchange in my city is a 3-lane roundabout with traffic lights. The motorway carries between 130.000 and 110.000 vehicles, while the N337 dumps about 45.000 vehicles a day on the roundabout. Yet this is not very congested.
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Old January 3rd, 2008, 04:06 PM   #531
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This reminds me of The Rotor in Zagreb...
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Old January 3rd, 2008, 05:24 PM   #532
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Quote:
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This reminds me of The Rotor in Zagreb...
roundabouts here shown have larger radius that the rotor and aren't so congested.
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Old January 3rd, 2008, 05:29 PM   #533
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Quote:
Originally Posted by The Knowledgeable View Post
You forgot the roundabout interchange!


Essentially the same as any roundabout, only that one motorway is grade-separated from the roundabout and the intersecting motorway. This type is extremely common in the UK.
There is also an advanced variation of roundabout interchange, called three-level stacked interchange:


Where the two intersecting motorways as well as the roundabout itself are grade separated.

Both are considerably cheaper than their clover/stacked counterparts, however both have low capacity.


Lofthouse Interchange, Yorkshire, UK

http://maps.google.com/maps?q=Braint...&t=h&z=17&om=1
Pilgrims Hwy with Union St., Braintree, MA

http://maps.google.com/maps?q=Gardne...&t=h&z=18&om=1
MA Route 2 with Pearson Blvd., Gardner, MA

They're going to be building one of these ******* things at the future N18/17/6 interchange in Ireland Three Level Stacked roundabouts - you'd have think they'd ******* learned by now.
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Old February 19th, 2008, 07:18 PM   #534
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Ah, In Turkey it's not higher than 3 level!
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Old February 19th, 2008, 10:49 PM   #535
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Houston...5 stack paradise














Last edited by SkyView; February 19th, 2008 at 10:55 PM.
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Old February 20th, 2008, 07:59 AM   #536
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The I-43/94/794 'Marquette' interchange in downtown Milwaukee, WI (USA), currently under construction to replace its older version, is an irregular five levels.

http://www.mchange.org/page.jsp?&key=tni

Mike
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Old April 20th, 2008, 07:53 AM   #537
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Quote:
Originally Posted by noblergt View Post
Here is a good page about different types of junctions:

http://www.cbrd.co.uk/reference/interchanges/

One of the only good things about the UK's motorway system is that we have never had any cloverleafs.
There is one near my old house in Redditch, Worcestershire. On the A441
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Old April 20th, 2008, 11:29 AM   #538
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Who can explain this junction?

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Old April 20th, 2008, 11:46 AM   #539
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What kind of interchange does this count as?

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Old April 20th, 2008, 11:52 AM   #540
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That's not a single junction there

I see 2x semi-directional Ts, a half cloverleaf and elements of a parclo and a diamond...

Last edited by Realek; April 20th, 2008 at 12:08 PM.
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