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Old December 9th, 2007, 07:58 PM   #501
ChrisZwolle
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Holy moly that's an impressive interchange!
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Old December 11th, 2007, 07:50 AM   #502
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The I-610/U.S. 59 one is surprisingly nice looking from above.
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Old December 11th, 2007, 08:12 AM   #503
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It seems like 5-level interchanges are only possible when you have intersecting frontage/service/access roads, otherwise you'll have a four level stack.
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Old December 11th, 2007, 01:41 PM   #504
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Quote:
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I don't know how many levels this is, but it looks huge and its, i think proposed, for baltimore. it looks pretty big even if it isn't 5 levels

Holly smoke!

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Old December 11th, 2007, 01:52 PM   #505
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Quote:
Originally Posted by FM 2258 View Post
It seems like 5-level interchanges are only possible when you have intersecting frontage/service/access roads, otherwise you'll have a four level stack.
or HOV lanes
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Old December 11th, 2007, 04:19 PM   #506
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This is the Spaghetti Junction in Birmingham,England not sure how many levels it has four at least.








Last edited by marrio415; December 11th, 2007 at 04:25 PM.
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Old December 11th, 2007, 04:59 PM   #507
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Quote:
Originally Posted by MDguy View Post
I don't know how many levels this is, but it looks huge and its, i think proposed, for baltimore. it looks pretty big even if it isn't 5 levels

WOW! That's a Huge project! Probably as big as the Springfield Interchange Project in Virginia or probably bigger!
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Old December 11th, 2007, 05:28 PM   #508
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that's almost the size of an old town or a small village!
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Old December 11th, 2007, 05:34 PM   #509
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I think this is only a 3-level stack. But it looks pretty big. It's in Tampa, Florida.
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Old December 11th, 2007, 06:02 PM   #510
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Quote:
Originally Posted by marrio415 View Post
This is the Spaghetti Junction in Birmingham,England not sure how many levels it has four at least.







I counted only three.
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Old December 12th, 2007, 03:10 PM   #511
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yeah, me too
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Old December 27th, 2007, 07:51 AM   #512
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Motorway junction types

There are many different types of junctions. And although it looks like if there are hundreds of different lay-outs, sizes and shapes, almost all of them are spin-offs from 5 basic forms.

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.
----------------
4) Turbine or Whirlpool



Essentially the same as the stack but with slightly less capacity because the semi-directional ramps bend and sweep around the center in the form of a 3/4 roundabout.
----------------
5) Windmill:



Same as turbine but the ramps make a tighter turn around the center of the interchange reducing the speed and capacity. It's also cheaper to built because it requires fewer viaducts.
----------------
Variations:

Common crossovers from the five above are the:
1) Cloverstack


2) Cloverturbine
http://maps.google.nl/maps?f=q&hl=nl...&t=k&z=16&om=1

3) Starturbine
http://maps.google.nl/maps?f=q&hl=nl...wloc=addr&om=1

4) Double trumpet (mostly between tolled and untolled motorways)
http://maps.google.nl/maps?f=q&hl=nl...wloc=addr&om=1

5) Clovermill


---




I'll add some more info in the future
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Last edited by CborG; December 28th, 2007 at 01:28 AM.
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Old December 29th, 2007, 10:40 PM   #513
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nice job here, very interesting
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Old December 30th, 2007, 05:47 AM   #514
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Several of Ohio's old Cloverleaf interchanges are being upgraded to this style of interchange, which I don't believe is seen anywhere else:



With 2 flyovers, 1 loop, and 1 flyunder, it eliminates weaving entirely. Since the ramps spend less time off the ground and are closer to the ground, they are more practical than a stack interchange in Ohio's winters when long high ramps become icy. That said Ohio does have 4 four level stack interchanges, including 3 in Cleveland, its most snow prone city.

Last edited by Paddington; December 30th, 2007 at 05:59 AM.
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Old December 30th, 2007, 06:44 AM   #515
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This one in Zagreb, Croatia is a perfect example of a clover-stack:
[IMG]http://i17.************/6sl7qj4.jpg[/IMG]

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Old December 30th, 2007, 06:47 AM   #516
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Quote:
Originally Posted by Ballota View Post
This one in Zagreb, Croatia is a perfect example of a clover-stack:
[IMG]http://i17.************/6sl7qj4.jpg[/IMG]

it must be one of the broadest in the world....
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Old December 30th, 2007, 11:54 AM   #517
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Quote:
Originally Posted by Paddington View Post
Several of Ohio's old Cloverleaf interchanges are being upgraded to this style of interchange, which I don't believe is seen anywhere else:

http://www.dot.state.oh.us/161next/i...age4_large.jpg

With 2 flyovers, 1 loop, and 1 flyunder, it eliminates weaving entirely. Since the ramps spend less time off the ground and are closer to the ground, they are more practical than a stack interchange in Ohio's winters when long high ramps become icy. That said Ohio does have 4 four level stack interchanges, including 3 in Cleveland, its most snow prone city.
A very efficient way of eliminated old, slow-speed, traffic jam causing cloverleafs. Cloverleafs are only efficient with low traffic levels. Cloverleafs with parallel lanes are somewhat more efficient, but you barely see cloverleafs with a 2 lane connectorlane, so their capacity is low.

The worst Dutch cloverleaf is interchange Hoevelaken near Amersfoort i think, this one's even often jammed on sundays. They are also not efficient with large loads of trucks, since they have to slow down to like 30 to 50 depending on the size of the cloverleaf.

German cloverleafs are often extremely compact, with 30 km/h turns. A lot of German autobahn infrastructure is outdated.
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Old December 30th, 2007, 04:44 PM   #518
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This site is really fun:

http://www.cbrd.co.uk/badjunctions/
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Old December 30th, 2007, 05:23 PM   #519
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Quote:
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This site is really fun:

http://www.cbrd.co.uk/badjunctions/
Yeah, I go the sometimes.
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Old December 30th, 2007, 06:02 PM   #520
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Quote:
Originally Posted by OettingerCroat View Post
it must be one of the broadest in the world....
Hahaha...yeah...
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