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re: Interstate Cable Barriers

Posted on 1/4/15 at 2:43 pm to
Posted by kywildcatfanone
Wildcat Country!
Member since Oct 2012
119430 posts
Posted on 1/4/15 at 2:43 pm to
Your tax money goes to other things first, such as healthcare and benefits for illegals. They will get around to doing things that benefit the taxpayers when all other wants are taken care of, if there is any money left.
Posted by AndyCBR
Baton Rouge, LA
Member since Nov 2012
7556 posts
Posted on 1/4/15 at 5:27 pm to
quote:

You guys just aren't getting it


Nothing to "get".

Sure you prevent some crossover fatalities but the cable barriers:

1) Are 100% ineffective when they are in their non-repaired state for hundreds of yards at a time per incident. Often for extended periods of time.

2) Create a new hazard for ALL motorists traveling on the near side from loss of runoff and scattering of debris.

3) Are very expensive to maintain and suffer extensive damage from the most minor swerving incidents on the near side. Incidents that would have resulted in no accident or damage to the vehicle/roadway are now major incidents.

It's another great example of stupidity in design and execution by a wasteful federal government.


Posted by The Boat
Member since Oct 2008
164336 posts
Posted on 1/5/15 at 5:03 am to
The should just say frick it and put up concrete barriers like Texas did on I-20 between Dallas and Shreveport. They look ugly as sin but no car is getting through that.
Posted by Road Tiger
SW Landmass
Member since Oct 2014
834 posts
Posted on 1/5/15 at 8:23 am to
quote:

Are very expensive to maintain and suffer extensive damage from the most minor swerving incidents on the near side. Incidents that would have resulted in no accident or damage to the vehicle/roadway are now major incidents.


The whole point of cable vs. concrete barriers is the difference in you walking away from an accident. Cables are meant to deflect and bend. That's to slow your car down at a slower rate. Concrete has no give and if you hit a concrete barrier at interstate speeds your odds of surviving decrease dramatically.

You clearly have no idea of what you're talking about.
Posted by member12
Bob's Country Bunker
Member since May 2008
32119 posts
Posted on 1/5/15 at 8:25 am to
quote:

Concrete has no give and if you hit a concrete barrier at interstate speeds your odds of surviving decrease dramatically


Concrete barriers are not unsafe. You do realize that most points of contact with any median highway barrier running parallel to travel lanes are going to be a glancing blow and not a head on collision, right?

There is more give in the cables, but the main reason they are popular now because there aren't many other options for medians with a drainage swale, which is what most rural American interstate highways have.

I think they need to redesign them to be useful further from the highway. They are just too close, subjecting them to minor impacts. It's a good idea that needs to evolve.
This post was edited on 1/5/15 at 8:34 am
Posted by Road Tiger
SW Landmass
Member since Oct 2014
834 posts
Posted on 1/5/15 at 8:35 am to
quote:

You do realize that most points of contact with any median highway barrier running parallel to travel lanes are going to be a glancing blow and not a head on collision, right?


In an urban setting with a tight corridor, yes that is correct.

But in instances where you're talking about wide open pieces of interstate, you're not dealing with glancing blows. You're looking at things like drivers falling asleep at the wheel and veering into the median. That is where cables come in.

What end treatment do you propose for a concrete barrier in the middle of the interstate with a 75 mph speed limit? How can you design that safely with no chance of fatalities?

ETA: I realize that with everything, there is some chance of fatality. But in road design, you design at the absolute minimum risk, especially with interstates.
This post was edited on 1/5/15 at 8:40 am
Posted by GetCocky11
Calgary, AB
Member since Oct 2012
51364 posts
Posted on 1/5/15 at 8:37 am to
quote:

Do they actually stop cars from going across?


Yes, they absolutely do. Crossover accidents were a big problem in SC before they went up.
Posted by jmarto1
Houma, LA/ Las Vegas, NV
Member since Mar 2008
34045 posts
Posted on 1/5/15 at 8:40 am to
Aesthetically, they look awful and are in disrepair in a lot of places. I wish we'd find something that can take a hit and look good.
Posted by Sir Drinksalot
Member since Aug 2005
16750 posts
Posted on 1/5/15 at 8:43 am to
I read up on them one day. Very interesting.

3 million dollars per mile is what I think the article said.

This was after I saw one rip a car apart. But the stats showed they worked.
This post was edited on 1/5/15 at 8:45 am
Posted by PhiTiger1764
Lurker since Aug 2003
Member since Oct 2009
13917 posts
Posted on 1/5/15 at 8:57 am to
Extensive research and crash testing has been done with cable barriers. The use of cable barriers are based on ADT, clear zone requirements, median width, crash history/severity, and a host of other things.

A lot of what you are spewing is simply garbage based on your bias as a motorcyclist. You simply don't know what you're talking about.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43030 posts
Posted on 1/5/15 at 11:09 am to
You're still not getting it. The main difference between the two is that the cables "catch" you and absorb the impact much better than concrete because they stretch and break. It is basically a conservation of momentum concept when you break it down

And to your point about them being close to the road, I haven't seen any that didn't at least have a lane's width between the edge of the road and the cable. There is a reason for that also


*I'm no traffic engineer, but if you look at everything logically and use your ENTIRE brain, you should be able to figure this stuff out
Posted by AndyCBR
Baton Rouge, LA
Member since Nov 2012
7556 posts
Posted on 1/5/15 at 6:44 pm to
quote:

Extensive research and crash testing has been done with cable barriers. The use of cable barriers are based on ADT, clear zone requirements, median width, crash history/severity, and a host of other things.

A lot of what you are spewing is simply garbage based on your bias as a motorcyclist. You simply don't know what you're talking about.



You're entitled to your opinion and so am I. That doesn't make it garbage. As far as my opinion being based on a motorcyclists view, that is certainly part of it. As a point of reference the cable barrier systems are not allowed in Europe due to the hazard they present to motorcyclists.

Many of my statements are mirrored by the Federal Highway Administration:

LINK

"While cable median barriers have low installation costs, they can be to maintain due to the number of crashes that result in damage. Even though the cost of a crash is generally low, the system receives some damage from even slight hits, and needs to be repaired to provide optimum performance. Also, even low tension cable does not always go down on impact. It is more likely than high tension cable to go down after a hit."

A Kansas DOT official also questions their overall effectiveness here:

LINK

"“Cable barriers are not benign. They don’t solve all the problems and can in some situations create problems,” KDOT Secretary Deb Miller said Friday. “So our deliberations must center on whether they provide more benefits or create more liabilities. The question isn’t: Do we have the money? The question is: Is this the right strategy?”

Caltrans agrees:

LINK

"The California Department of Transportation used the cable rail system as their standard during the early 1960s, but abandoned it by 1978. The agency stated in its 1997 Cable Median Barriers Report that the cable barrier is "the least expensive to install, but it has had the worst accident experience and is the most expensive to maintain.""

For someone to state, as you do, emphatically, that cable barriers are without a doubt the only and best answer to highway safety demonstrates your lack of knowledge on the subject matter.

Spending of this type is a hallmark of our federal government. Low initial cost and high maintenance costs forever. An increase in safety in one metric, and a decrease in safety in many others.


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