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Old June 6th, 2008, 10:37 AM   #21
ChrisZwolle
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This crashbarrier is probably a few decades old.
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Old June 6th, 2008, 10:46 AM   #22
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Quote:
Originally Posted by Chriszwolle View Post
This crashbarrier is probably a few decades old.
doesn't matter as far as it serves the job. Good project.
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Old June 11th, 2008, 03:45 AM   #23
Aerin
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Quote:
Originally Posted by pmaciej7 View Post
Despite crasbarriers are important part of road infrastructure, we don't have thread dedicated to them yet (or i couldn't find it).
As you all know, shiny crashbarrier is a detrminant of high-tech road. So let's have a review of crashbarriers in different countries.

Poland:
Steel:
A1 near Grudziądz. Double crashbarrier.
Is it wise to use barriers that have the ends sloping downwards such as the one shown above? It looks like it can launch errant vehicles into outer space. Why not simply maintain the height of the barrier throughout its length and place crash cushions at the end(s)?
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Old June 11th, 2008, 06:18 PM   #24
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Picture is made from temporary road crossing motorway under construction. They had to end this barrier like this in this moment. After opening, there will be continous barrier.

I hadn't better picture and this one was posted only to show double barrier on polish road.
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Old June 11th, 2008, 06:20 PM   #25
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Old June 11th, 2008, 09:40 PM   #26
Aerin
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Quote:
Originally Posted by pmaciej7 View Post
Picture is made from temporary road crossing motorway under construction. They had to end this barrier like this in this moment.
Why?
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Old June 11th, 2008, 09:43 PM   #27
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Such ends like the Polish picture are actually pretty standard. We use them all the time in the Netherlands near objects that are close to the roadway, like viaduct pillars or signage gantry's.

It's better to slide on that thing than crash directly against it. However, it's better just to stay on the road
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Old June 11th, 2008, 09:49 PM   #28
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They actually make special ends for crashbarriers that absorb the energy.
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Old June 11th, 2008, 10:13 PM   #29
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Quote:
Originally Posted by Aerin View Post
Why?
To cross a motorway before viaduct is finished.

Look at the barriers.


Now turn around.


View from other side.
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Old June 12th, 2008, 12:02 AM   #30
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Quote:
Originally Posted by Chriszwolle View Post

It's better to slide on that thing than crash directly against it. However, it's better just to stay on the road
i absolutely agree. todays near my house there was an accident, a car crashed into "cut" end of crashbarrier (so not the "slide" one), it entered into car through windshield and reached rear seats it was an ugly scene. and speed was not high, under 50 km/h because it was the beginning of the road
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Old June 12th, 2008, 12:30 AM   #31
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Quote:
Originally Posted by Chriszwolle View Post
Such ends like the Polish picture are actually pretty standard. We use them all the time in the Netherlands near objects that are close to the roadway, like viaduct pillars or signage gantry's.

It's better to slide on that thing than crash directly against it. However, it's better just to stay on the road
Quote:
Originally Posted by Rebasepoiss View Post
They actually make special ends for crashbarriers that absorb the energy.
Quote:
Originally Posted by x-type View Post
i absolutely agree. todays near my house there was an accident, a car crashed into "cut" end of crashbarrier (so not the "slide" one), it entered into car through windshield and reached rear seats it was an ugly scene. and speed was not high, under 50 km/h because it was the beginning of the road
In Norway (and I believe Sweden) "cut end" crashbarriers have been obsolete for several decades (40 years?) for obvious reasons. Also the Polish (and it seems Dutch) ramps (which in Norway typically would lead the car down an abyss...) have been phased out during the last decade. The standard and safest way to end a crash barrier is either to bend them away from the road (cheapest, but require a few meters at the side of the road, and of course only works for steel barriers, not Jersey) or to indeed make an absorbing "cushion":

(This, picture was the only one I could find, but there are many models used in Norway. They are quite expensive, I guess, but of course whenever they have to be replaced the road authorities feel very good since they know that the cushion probably saved at least one life.



Quote:
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This looks like a serious waste of steel, surely there are cheaper (and equally effective) ways of making a barrier....
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Old June 12th, 2008, 01:48 AM   #32
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Quote:
Originally Posted by Chriszwolle View Post
Such ends like the Polish picture are actually pretty standard. We use them all the time in the Netherlands near objects that are close to the roadway, like viaduct pillars or signage gantry's.

It's better to slide on that thing than crash directly against it. However, it's better just to stay on the road
Yes I've seen them in other countries also, but can't remember which, though. I do understand why the ends are angled but then there is still a downside to the design.

As I and others have noted, crash cushions can be placed to prevent a vehicle from directly crashing against the barriers. In addition, there are some crash cushions that will also redirect errant vehicles when impacted from the side.
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Old June 12th, 2008, 06:55 AM   #33
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Minnesota tested the cable gaurdrails about 5 yrs ago. Since then we have been installing them everywhere. They can stop an 18 wheeler from crossing over into oncoming traffic very well. Normally with minimal damage to the vehicle due to the fact that the cables flex and absorb the impact instead the vehicle taking the impact(as with steel and concrete barriers). You have to be carefull where you place traffic barriers because they are a roadside hazard themselves many people die each year from hitting them.
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Old June 12th, 2008, 09:17 AM   #34
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Quote:
Originally Posted by 54°26′S 3°24′E View Post
This looks like a serious waste of steel, surely there are cheaper (and equally effective) ways of making a barrier....
There are two because of the viaduct pillars in the median.
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Old June 12th, 2008, 05:25 PM   #35
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Quote:
Originally Posted by Chriszwolle View Post
There are two because of the viaduct pillars in the median.
That certainly makes it more understandable!
Quote:
Originally Posted by MSP View Post
Minnesota tested the cable gaurdrails about 5 yrs ago. Since then we have been installing them everywhere. They can stop an 18 wheeler from crossing over into oncoming traffic very well. Normally with minimal damage to the vehicle due to the fact that the cables flex and absorb the impact instead the vehicle taking the impact(as with steel and concrete barriers). You have to be carefull where you place traffic barriers because they are a roadside hazard themselves many people die each year from hitting them.
Cable guardrails are very popular in Sweden and Denmark as well. Another advantage with them is that they does not take much road area. In Sweden they have transformed many old single carriage 13 m wide roads (2 lanes + wide hard shoulders) into much safer dual carriage ways just by placing such a fence in the middle. In Norway they also installed quite a lot of these fences a couple of years ago, mostly in the medians of motorways, but they quickly angered the MC community which called them "egg slicers", so they are no longer being installed.
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Old June 13th, 2008, 02:08 AM   #36
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Cable barrier in Kennedy Avenue (expressway), Santiago, Chile.

Cable barriers are rare in Chile.







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Old June 20th, 2008, 04:11 PM   #37
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This could happen without a well designed crash barrier....

The big jump....

I am not sure if the road this guy was driving even had a barrier...

These accidents happened with a day or two between in Norway...
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Old June 20th, 2008, 04:20 PM   #38
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Quote:
Originally Posted by Chriszwolle View Post
near objects that are close to the roadway, like viaduct pillars or signage gantry's.

It's better to slide on that thing than crash directly against it. However, it's better just to stay on the road
Once happened in Slovenia, that a car crashed in such sort of crash barrier. Car was catapulted into nearby signage portal, which had pillar in the middle, crashed into it and then fell onto other side. I think 4 dead in that car and in car from opposite side, which crashed into catapulted one.

If it would just crashed into normal crashbarrier (on that place crashbarrier was closed into continuous one), probably no one would die.

Catapulting ends are very unsafe.
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Old June 20th, 2008, 04:34 PM   #39
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I never heard such things in the Netherlands. The slides are also not very steep, but last for like 10 meters or more. Maybe that guy in Slovenia drove way too fast.
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Old June 21st, 2008, 01:10 AM   #40
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Quote:
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If it would just crashed into normal crashbarrier (on that place crashbarrier was closed into continuous one), probably no one would die.

Catapulting ends are very unsafe.
khm, i'm not sure. imagine what happens when there are 4 people in a car and the crash into "cut" crashbarrier which enter into car through front windshield
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