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Old August 23rd, 2011, 01:09 AM   #41
g.spinoza
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alserrod, why not use the geoid, like in the rest of the world?
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Old August 23rd, 2011, 01:24 AM   #42
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Quote:
Originally Posted by g.spinoza View Post
alserrod, why not use the geoid, like in the rest of the world?


Didn't exist in the 19th century... : Cheers:



Surfing on the web.... at the end of 19th century and for more than 10 years it was calculated the sea level altitude at Alicante thanks to the tide-meter.
Considering the tools they had, precission was very high.

They started to calculate all altitudes always with that reference (end of 19th century) and had been considered official at all.

Using any computering program today we will have similar altitudes than those calculated more than one century ago.


As it can be though, sea level at Atlantic is upper than in Mediterranean (where water evaporation is highest and it is enough to see ocean current at Gibraltar strait).

This is why they chose a new point in the Atlantic for specific meditions... but in any case, all Atlantic cities will be oficially 1,5m over sea level at least!!!.
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Old August 23rd, 2011, 01:25 AM   #43
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Hungary

M1 - Nagyegyháza/Szárliget: 270m


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Old August 23rd, 2011, 10:00 AM   #44
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Isn't it near section with many tunnels?
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Old August 23rd, 2011, 10:05 AM   #45
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Quote:
Originally Posted by seem View Post
Isn't it near section with many tunnels?
There are no tunnels on M1 in Hungary. The only motorway tunnels in Hungary are on M6.

u/c picture:
Quote:
Originally Posted by Qtya View Post
A bit earlier aerial photo of the u/c tunnels of M6...

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Old August 23rd, 2011, 10:20 AM   #46
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Where those tunnels necessary? From the pic it looks like they could have built the motorway without them and without viaducts, just with a little of uphills and downhills...
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Old August 23rd, 2011, 10:47 AM   #47
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It looks quite ridiculous how they built such a tunnels on a lowland. In Slovakia we built motorways in some nice valleys just to avoid tunnels - http://www.skyscrapercity.com/showpo...postcount=2106
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Old August 23rd, 2011, 11:52 AM   #48
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In Spain they will never make a tunnel for that type of road.
Furthermore... there are cases when I ask myself why they didn't planned a tunnel somewhere (when more necessary)... and the reason is the cost.
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Old August 23rd, 2011, 12:54 PM   #49
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Quote:
Originally Posted by g.spinoza View Post
Where those tunnels necessary? From the pic it looks like they could have built the motorway without them and without viaducts, just with a little of uphills and downhills...
The initial option was to build the road trough open cuts of 30-50 metres deep and build longer and higher viaducts. As the soil is silt and clay, that appoach would have had a major impact to the landscape. The cut would have been several hundred meters wide. To create a more esthetic solution, they decided to build those tunnels.
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Old August 23rd, 2011, 01:06 PM   #50
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Spain: Already said. But according to Google Earth, the E05 only reaches 1440 meters above sea level. AP-6 climbs to about 1290 meters. When completed, E07 will reach 1280 meters.

And as said, the highest paved road in Europe is not the Restefond pass in France (2802 meters), but the Veleta peak (3367 meters). But that is restricted, so Restefond keeps as winner. I know there is a pass on Canary islands at 2300 meters.

And outside my country, I've read that Chinese will build an expressway up to 5100 meters above sea level. Currently they have one at 3800 meters, and roads up to 6000 meters (Maybe highest in the world?).
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Old August 23rd, 2011, 02:08 PM   #51
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Quote:
Originally Posted by MattiG View Post
The initial option was to build the road trough open cuts of 30-50 metres deep and build longer and higher viaducts. As the soil is silt and clay, that appoach would have had a major impact to the landscape. The cut would have been several hundred meters wide. To create a more esthetic solution, they decided to build those tunnels.
But you don't need any tunnels or cuts. You just go over, repeat: over the hills.
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Old August 23rd, 2011, 02:22 PM   #52
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Germany:

Highest road *should be* the one leading to Kehlstein (Hitler's Eagle's nest), ca. 1700m, but it is closed to normal traffic and only buses can go up there. This is a picture taken by me at the end of the road (but I did not take the bus, I hiked up there instead):


Highest regular road should be Roßfeld high ring road, ca. 1560 m.

from www.koenigssee.com

Highest motorway is A980 at 947 m:

from geocaching.com
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Old August 23rd, 2011, 04:07 PM   #53
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Quote:
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But you don't need any tunnels or cuts. You just go over, repeat: over the hills.
They were building a motorway, not a rollercoaster.

The hills are rather steep, up to 7% in average. That steep climbs are usually avoided on motorways.
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Old August 23rd, 2011, 05:20 PM   #54
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Quote:
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Where those tunnels necessary? From the pic it looks like they could have built the motorway without them and without viaducts, just with a little of uphills and downhills...
No. Would have been solvable without tunnels, but the politicians wanted tunnels and viaducts (more cost, more corruption, it was built up under the social-liberal government).


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Old August 23rd, 2011, 05:28 PM   #55
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Quote:
Originally Posted by MattiG View Post
They were building a motorway, not a rollercoaster.

The hills are rather steep, up to 7% in average. That steep climbs are usually avoided on motorways.
7%? It doesn't look that steep on the pictures at all, my bad.

That would be a fun trip
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Old August 24th, 2011, 12:15 AM   #56
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A positive point: these tunnels add some variety on an elsewhere flat scenery. Keeping drivers interested and awake is a good thing...
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Old August 24th, 2011, 12:42 AM   #57
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Hungary is probably a country which can afford such a things.

It is same as here, just to make motorway more expensive.

The new government is doing really well, so far they have saved up to about 500 million € on a on going motorway projects comparing to the old government.
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Old August 24th, 2011, 12:57 AM   #58
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Vielha tunnel has a 5% pendant and a length of 5,1 km.

Southern entrance to tunnel is at 1605 m



N-230 from Lérida (A-2) to France via Viella
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Old August 24th, 2011, 10:17 PM   #59
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Greece

National Roads: Katara Pass 1705m (on NR6) - Pisoderi Pass 1420m (on NR2) - Polymylos Pass 1360m (on NR4) - Vytina Pass 1135m (on NR74) - Artemisia Pass 1024m (on NR82).

Motorways tend to avoid high altitudes by cutting through tunnels. I assume that the highest points should be at about 800 - 900m on quite a lot of points on the A2 between Ioannina and Kozani and around Artemisio Tunnel on the A7.
Katara Pass
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Old August 25th, 2011, 12:04 AM   #60
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People's Republic of China:

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And outside my country, I've read that Chinese will build an expressway up to 5100 meters above sea level. Currently they have one at 3800 meters, and roads up to 6000 meters (Maybe highest in the world?).
Currently no timetable for the 5100-meter expressway, not in this decade.

Road: 5,433 meters above sea level, China National Highway G219 from Kargilik in Xinjiang to Lhatse in Tibet

Pictures: Building a highway 5,000 meters high (China Daily)

Motorway: 3,650 meters above sea level, Lhasa to Gonggar Airport Expressway (world's highest)

World's highest motorway, connect Lhasa to its international airport, in Tibet, opened in July 2011:






Last edited by yaohua2000; August 25th, 2011 at 12:36 AM.
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