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Old June 6th, 2011, 01:49 PM   #3281
g.spinoza
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Thanks muc. I'm not sure but I think that the ramp from Deggendorf to Nürnberg has been also recently changed. I drove there yesterday again but I didn't have the chance to look carefully. It seems to me that the ramp entrance has been moved few hundreds of meters ahead. Can you confirm this?
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Old June 6th, 2011, 03:48 PM   #3282
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Quote:
Originally Posted by g.spinoza View Post
Thanks muc. I'm not sure but I think that the ramp from Deggendorf to Nürnberg has been also recently changed. I drove there yesterday again but I didn't have the chance to look carefully. It seems to me that the ramp entrance has been moved few hundreds of meters ahead. Can you confirm this?
It has been rerouted already a few months ago, if you mean the ramp on the right side of this photo, compared to the one closed: http://www.panoramio.com/photo/49093517
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Old June 6th, 2011, 09:49 PM   #3283
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Is there a specific purpose to the curbs on the Autobahn? And why is it there on some sections and not others?
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Old June 7th, 2011, 06:45 PM   #3284
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Is there a specific purpose to the curbs on the Autobahn? And why is it there on some sections and not others?
Kerbs are placed where surface water cannot or must not trickle into the soil beside the carriageway.
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Old June 7th, 2011, 11:49 PM   #3285
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Quote:
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Kerbs are placed where surface water cannot or must not trickle into the soil beside the carriageway.
Does that affect the drainage capabilities? It seems like water would stay on the roadway around the curbs.
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Old June 12th, 2011, 09:18 AM   #3286
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Alright, I would like a debate:

Which do you prefer and why: Parallel merge/diverge slip roads or tapered merge/diverge slip roads?

I'm going to post the same question in the U.S. Interstates thread to compare responses. Feel free to discuss in both threads.
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Old June 12th, 2011, 09:01 PM   #3287
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I don't know if it has been said in the thread but they're reconstructing part (or all) of the Kreuz Neufahrn interchange between A9 and A92... I passed there yesterday on my way to the airport, and I saw signs stating that the reconstruction will be complete by December 2011.
You can see on Openstreetmap what they are doing: Kreuz Neufarhn

I think the use of a semi-directional ramp to replace a loop is quite a common way of upgrading a cloverleaf (is there a name for it?) but I haven't seen one of the right-hand movements (or left-hand, in countries that drive on the left) rebuilt like this, but it is a rather odd ramp as it curves in the middle round the loop, rather than just at each end. There's also some nice braiding being added too.
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Old June 13th, 2011, 09:07 PM   #3288
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Some pictures of German autobahns which I took 2 months ago when I went to Essen for a short trip -

image hosted on flickr


image hosted on flickr


image hosted on flickr


image hosted on flickr


image hosted on flickr
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Old June 13th, 2011, 09:28 PM   #3289
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At the picture no. 2 can be seen, that the right viaduct (in direction Hamburg) had carried the entire Autobahn before widening. The left viaduct has been built when the Autobahn was widened from 2+2 to 3+3.
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Old June 13th, 2011, 09:43 PM   #3290
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Quote:
Alright, I would like a debate:

Which do you prefer and why: Parallel merge/diverge slip roads or tapered merge/diverge slip roads?

I'm going to post the same question in the U.S. Interstates thread to compare responses. Feel free to discuss in both threads.
I guess many people here don't even know what is a tapered slip road. At least I didn't know before looking into the US thread.

I prefer parallel acceleration/deceleration lanes by far. They allow you to match your speed with the traffic on the right lane of the highway before merging and to slow down before you enter the off-ramp. So I think they are much safer especially where high speeds are allowed.
I don't think you'll find tapered slip roads on modern Autobahns.
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Old June 13th, 2011, 10:56 PM   #3291
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Quote:
Originally Posted by ed110220 View Post
You can see on Openstreetmap what they are doing: Kreuz Neufarhn
I do not understand what is the purpose of the lane in construction connecting directly Eching Ost exit with the Kreuz...
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Old June 13th, 2011, 11:06 PM   #3292
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The purpose is to avoid conflicts between the Eching->A92(West) flux and A92(East)->A9(South) flux. Eching Ost is too close to che Kreuz, you would have a very short distance for lane choice (for German standards, of course).

You build an overpass to reduce the need of changing lanes, in major junctions it is a good practice.
The same reason why they're upgrading all major cloverleaf. The aim is to have only bifurcations where you choose your destination, and then you never cross any other path until you merge on the last road.

Best example is the famous Frankfurter Kreux:
http://goo.gl/maps/Pks0

You can see that all the interchange arms overpass the others: if you look closely, following a direction from one road to the last one, you'll have almost no need to change lane.
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Old June 13th, 2011, 11:32 PM   #3293
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Thanks!
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Old June 16th, 2011, 10:30 AM   #3294
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Can someone explain to me what do blue signs with U## mean? These ones:

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Old June 16th, 2011, 11:03 AM   #3295
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They are detours, each with its own number. If I remember correctly, the U stands for Umstieg/Umstiegen.

Pretty useful to have a route number also for detours!
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Old June 16th, 2011, 11:22 AM   #3296
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Do you mean detour as in roadworks? I don't think so, because they are permanent and very common.
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Old June 16th, 2011, 11:23 AM   #3297
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U=Umleitung=detour

very useful in case of traffic jams. Just follow the U signage and you will get back to the Autobahn.
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Old June 16th, 2011, 11:26 AM   #3298
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No, these detours (Umleitungen) are pre-created. The idea is that when there is a congestion on your way and you know where approximately, you will have the opportunity to exit the motorway before the queue starts. Then, you just have to follow the "U" signs with the number posted at the Ausfahrt, where you have left the autobahn. These signs will lead you to the next exit in your direction, where, supposedly, there will be no queue.
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Old June 16th, 2011, 11:44 AM   #3299
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Supposedly indeed. Most of the time, the U-route cannot handle the load of the motorists that exit the Autobahn in an attempt to bypass the queue. But if a motorway really gets blocked, there is use in the U-numbers. For the motorists and for the road authorities, that do not need to take any step at that stage to guide the motorist over the deviation.
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Old June 16th, 2011, 11:54 AM   #3300
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Quote:
Originally Posted by Christophorus View Post
U=Umleitung=detour
Thanks Umstieg is most used in railways.

As I use to say, I don't speak German, I only speak Eisenbahndeutsch
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Due to Photobucket f*cking up, most images won't be visibile in my old posts. If you need anything specific, please write me.
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