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Old May 30th, 2007, 05:44 PM   #281
Racingfreak
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My favorite freeway

http://www.youtube.com/watch?v=bH3jLTC3KEY
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Old May 30th, 2007, 11:21 PM   #282
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Do you call that racing? Everybody here in the northeast drives that speed.
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Old June 2nd, 2007, 09:16 PM   #283
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Do you call that racing? Everybody everywhere drives that speed
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Old June 2nd, 2007, 11:20 PM   #284
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Quote:
Originally Posted by DFM View Post
Do you call that racing? Everybody everywhere drives that speed
Not in the US.
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Old June 2nd, 2007, 11:46 PM   #285
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No, you fell asleep driving a car in the rural US
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Old June 2nd, 2007, 11:47 PM   #286
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Quote:
Originally Posted by Chris1491 View Post
No, you fell asleep driving a car in the rural US
I know, i was talking about urban freeways(at least in MD).
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Old June 2nd, 2007, 11:59 PM   #287
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Only 140. .
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J’aime Paris et je veux des tours !
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Old June 4th, 2007, 07:28 AM   #288
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huahuahua_321 that is the most amazing freeway!!!
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Old June 4th, 2007, 04:39 PM   #289
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Talking about the Big Dig, other cities have already started (and nearly finished) projects similar to this one to re-organize its congested inner traffic, for example Madrid. However, I think Boston's Big Dig is a way more complicated project than Madrid's one. Anyway, both of them, Boston and Madrid's projects are breath-taking.

From Discovery Channel Megabuilders:
Madrid's Inner Ring-Road, The M30.

Madrid is currently suffering a traffic crisis that needs to be solved quickly and efficiently, as the city has expanded rapidly in recent years and dangerous congestion is becoming an almost constant problem. Madrid’s inner ring road, the Calle 30, is the worst offender. The busiest road in Spain, running close to the Manzanares River, it is famous for its traffic jams and pollution.
The M30 project aims to solve the problems of gridlock on Madrid’s roads by refurbishing the road and running major sections of it beneath the city, creating new parkland and riverside above. A total of 99km of new road and 56km of tunnel will have been constructed by the time the project is completed. With an estimated budget of €3.7 billion and completion date (already behind) of mid-2007, this is a major undertaking!
The M30 Madrid Project is so massive that no less than seven Earth Pressure Balanced (EPB) Tunnel Boring Machines (TBMs) of various specifications have been specially ordered for the 15 separate projects around the city.

Here's a video showing major sections of the M30 beneath ground. Have a look at it:

Last edited by growingup; June 4th, 2007 at 10:46 PM. Reason: spelling
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Old June 4th, 2007, 05:07 PM   #290
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How busy is that M30 exactly? I heard it is about the busiest road of Europe.
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Old June 4th, 2007, 10:51 PM   #291
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Well, actually I don't know if M30 is the busiest road in Europe but it is among them, and for sure is Spain's busiest road. I think is very difficult to say which is the best freeway/highway (BTW, what's the difference?) in any european country... but I'll bet for those constructed recently xD.
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Old June 4th, 2007, 11:17 PM   #292
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I wish I had some computer savey or I would post more Canadian photos.
The 401 is great and a hoot to drive on but there are so many freeway roads in Canada that aren't getting on.
Many of those pictures have beautiful freeways and yet don't have to much traffic. If only Canadian roads had that kind of light traffic.
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Old June 6th, 2007, 07:55 PM   #293
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The Coquihalla in BC is probably the best if best means beautiful rather than busy.
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Old June 7th, 2007, 01:59 AM   #294
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Cloverleaf intersections and issues

Cloverleafs is IMO the most rational intersection. It only requires one single bridge and can handle more traffic than any bridge based roundabout, while it's a lot cheaper to build. There's two main arguments against cloverleafs.

Weaving and space-requirement.

Weaving
Weaving can be isolated on a CD road, the problem decrease a lot just by that.
There's lot's of ways to combat the actual weaving for heavy congested CLs. One way would be to build a banana like CD road connection with the leaf instead of a straight one. This would make it possible for incoming earlier and lose enough speed to make it possible for earlier, controlled weaving with the outgoing traffic. Another way is to apply roundabout rules/connections which make possible for outgoing traffic to exit safely while incoming traffic has to wait(cloverleafs is like 4 half circle-roads).

Lot's of space is taken
It can be designed to take less space. Just build the outer(right-90-degree-turning) ramps closer to the inner and the problem is solved.

This is some solutions in how to remake cloverleafs without destroying it's original 4 270 degree turns. Complete CLs also looks a lot better than 6 ramps partial CLs.
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Old June 7th, 2007, 03:17 AM   #295
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What about American stack interchanges, they eliminate weaving entirely:







The biggest downside is that they can be dangerous in cold weather, since the many long bridges can freeze. But then again Cleveland has three 4-level stack interchanges.

There's also this style of interchange, currently unnamed but a number of which that are currently under construction in Ohio:



As you can see, it's a modified cloverleaf, with three of the loops taken out and replaced with flyovers to eliminate weaving. Also, the length and number of bridges is minimized compared to a stack interchange, making it safer in cold weather places. This design also allows faster speeds on the ramps. It's major downside compared to a stack is the amount of horizontal space it takes up (stack interchanges are great in urban areas), but it's far superior to any cloverleaf.

And for surface road/expressway interchanges, there's the SPUI!



Here's one in Columbus: Single Point Urban Interchange
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Old June 7th, 2007, 12:37 PM   #296
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Quote:
Originally Posted by Paddington View Post
What about American stack interchanges, they eliminate weaving entirely:

The biggest downside is that they can be dangerous in cold weather, since the many long bridges can freeze. But then again Cleveland has three 4-level stack interchanges.
1. They cost too much to build.
2. The many bridges destroy the sight for the drivers.

Quote:
Originally Posted by Paddington View Post
There's also this style of interchange, currently unnamed but a number of which that are currently under construction in Ohio:



As you can see, it's a modified cloverleaf, with three of the loops taken out and replaced with flyovers to eliminate weaving. Also, the length and number of bridges is minimized compared to a stack interchange, making it safer in cold weather places. This design also allows faster speeds on the ramps. It's major downside compared to a stack is the amount of horizontal space it takes up (stack interchanges are great in urban areas), but it's far superior to any cloverleaf.
Well, if you want to eliminate weaving with flyovers, only two is required. But adding flyovers isn't the only way to combat weaving.

Quote:
Originally Posted by Paddington View Post
And for surface road/expressway interchanges, there's the SPUI!
Hmm.. don't get the point, it stops traffic, not only for those that wants to enter to the left, but also on the upper road. Wouldn't an ordinary cloverleaf work better here?

Quote:
Originally Posted by Paddington View Post
Here's one in Columbus: Single Point Urban Interchange
Should be upgraded into a CL. It seems that it barely can handle the traffic. Having traffic lights in a congested intersection doesn't make any sense.
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Old June 7th, 2007, 02:08 PM   #297
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Cloverleafs are okay for quiet intersections, with no great loads of traffic.

When traffic increases, you can build a parallel road for the weaving traffic.

It also depends on traffic patterns, when there is a lot of exiting traffic or TOTSO's (Turn Off To Stay On [roadnumber]), you might wanna extend the cloverleaf with some flyovers for some directions.

When you have very busy freeways intersectioning, the 4 level stack is a good option. It is more expensive, but a better flow guaranteed.
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Old June 7th, 2007, 03:49 PM   #298
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Actually I'm not sure that a cloverleaf can carry a lot more traffic than a typical British roundabout interchange, which requires a lot less land (although two bridges). Does anyone have figures?
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Old June 7th, 2007, 04:00 PM   #299
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Quote:
Originally Posted by Chris1491 View Post
Cloverleafs are okay for quiet intersections, with no great loads of traffic.

When traffic increases, you can build a parallel road for the weaving traffic.

It also depends on traffic patterns, when there is a lot of exiting traffic or TOTSO's (Turn Off To Stay On [roadnumber]), you might wanna extend the cloverleaf with some flyovers for some directions.
I agree that one or two flyovers can be built for TOTSO roads(two is enough to eliminate weaving). However I try to figure out how, converting a CL into six ramp interchange makes any sense. Apart from that. What is roundabout interchanges major advantage over CLs, except the space a traditional CL use? A CL is cheaper to build since it requires less bridges. It can pump more traffic, it's easier to upgrade and it's probably also safer.

Quote:
Originally Posted by Chris1491 View Post
When you have very busy freeways intersectioning, the 4 level stack is a good option. It is more expensive, but a better flow guaranteed.
Well as I've allready noted, two flyovers is enough to eliminate weaving. Building more than two saves some time for the drivers, but it's expensive and it doesn't increase safety, nor capacity.
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Old June 7th, 2007, 04:15 PM   #300
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Quote:
Originally Posted by chrishillcoat View Post
Actually I'm not sure that a cloverleaf can carry a lot more traffic than a typical British roundabout interchange, which requires a lot less land (although two bridges). Does anyone have figures?
The major traffic is often staying on both roads. A simple two-bridge-roundabout-interchange force one of the road to slowdown and enter a roundabout. There's also 10 kinds of traffic that have to share the roundabout. Even a more complex M-way roundabout-interchange is can't compete with a CL. One of the more famous such can be found in Manchester. Here is it. The reason is that traffic there's four kind of traffics that share the roundabout(not eight as it might have been when the IC was new).

M66-south -> M62-west
M62-east -> M62-south
M66-north -> M62-east
M62-west -> M66-north

In a CL, you would have four lanes for each of those traffics, so they don't have to share.
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