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PostPosted: Sat Sep 05, 2009 07:05 
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ree.t wrote:
Speed does not increase the likely hood of a collision, the increase in the density of things to collide into does.



I'd say both do.

More speed effectively increases the density of hazards as it's more likely a hazard will come into play.

Take a track, and fire some ball bearings down it. The ball bearings have a detector and can slow down and stop if they detect something being fired randomly across the track (the detector dosn't work properly on some ball bearings).

The faster the ball bearings are fired the more chance they have of striking the things going across the track, it's simply physics surely?


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PostPosted: Sat Sep 05, 2009 08:05 
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GreenShed wrote:
When you drive at higher speeds on what "appear" to be empty roads something unexpected may happen and an increased speed will reduce the time to be able to react to that. Examples may be a deer running into the road, a mechanical fault, a health problem/event...the list is not exhaustive.


Greenshed, we have to balance the probability of what might happen with what is going to happen. I don't drink much or smoke, but do eat properly and am fairly fit. So at a stroke I have removed much of the probability of an early expiry date.

As for driving, my car is meticulously maintained, so the wheels aren't going to fall off, if some thing leaps out in front of me, she should stop ok and the windows are clean, so I should be able to see.

When we drive through deer country a deer might leap out of the hedge in front of us. But how slow should we drive so we don't hit it? We could crawl along at walking pace and still have it land on our bonnet. They are brown and camouflaged so we can't seem 'em even if we are looking for them.

Drive with some COAST action going on and much of the risk is managed.


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PostPosted: Sat Sep 05, 2009 09:17 
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weepej wrote:
adam.L wrote:
All the road users are never going to travel at the same speed unless that is you want to limit everyone to what a digger travels at. Or in your case a bike.



Average speed.

You take the speeds of the vehicles going down the road and calculate an average.

You don't include bicycles and diggers.



A digger ist still traffic und if there are a lot of bicycles .. especially two abreast at 20 mph - then they would be a car width to pass und thus would have to be included in the average speed flow on that road.. because their impact make the average speed of your journey - oder? :popcorn:

You cannot disclude disinclude.. :? :? uninclude :? (:censored: what's the damn word!) a bicycle from the traffic when bicycles are part of the traffic :popcorn:

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PostPosted: Sat Sep 05, 2009 09:40 
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weepej wrote:
ree.t wrote:
Speed does not increase the likely hood of a collision, the increase in the density of things to collide into does.



I'd say both do.

More speed effectively increases the density of hazards as it's more likely a hazard will come into play.

Take a track, and fire some ball bearings down it. The ball bearings have a detector and can slow down and stop if they detect something being fired randomly across the track (the detector dosn't work properly on some ball bearings).

The faster the ball bearings are fired the more chance they have of striking the things going across the track, it's simply physics surely?



Except that in the case of most cars - believe it or not - some COAST at various levels of competence does go on. We are trying to help folk to harness, develop und improve upon these skills as constant. :popcorn:

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(& other good causes..)

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PostPosted: Sat Sep 05, 2009 10:28 
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adam.L wrote:
When we drive through deer country a deer might leap out of the hedge in front of us. But how slow should we drive so we don't hit it?



Well, if you drove at 5mph you should be OK, 15, sorted, 30 a bit more risky, 50 more risky still.

If you drive at 100 though the footprint of your future self reaching out in front of you means any deer popping out is more likely to be in this area (it gets bigger the faster you drive), and you are more likely to be involved in a collision.


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PostPosted: Sat Sep 05, 2009 10:50 
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weepej wrote:
ree.t wrote:
Speed does not increase the likely hood of a collision, the increase in the density of things to collide into does.



I'd say both do.

More speed effectively increases the density of hazards as it's more likely a hazard will come into play.

Take a track, and fire some ball bearings down it. The ball bearings have a detector and can slow down and stop if they detect something being fired randomly across the track (the detector dosn't work properly on some ball bearings).

The faster the ball bearings are fired the more chance they have of striking the things going across the track, it's simply physics surely?

While your simple explanation does make sense, I have to say that simple isolated effects of physics is trumped by real-world psychology and physiology. You can add some real-world risk homeostasis to that too(which was directed at you weepej, yet I didn't get an acknowledgement) :roll:

I can't help but notice how we're now going in circles.

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PostPosted: Sat Sep 05, 2009 10:56 
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Unless you happen to be institutionally complacent or a BiB of a certain ilk ... you know the type.. "goranaexempsham.. been twained..thinks this "twaining" gives super powers etc .. .":roll: - you would see no problem in driving at double the speed limit to get your doughnuts or drive at over the ton on a twisty rural like Over Kellett.


BUT like the NORMAL folk like on this message board .. you would not be at 100 mph in deer country. You would be aware.. looking ahead....to likely habitat... which can be

1. forests
2. former forest areas cleared for farm crops which do not have high enough fencing around.



It's a case of planning and being COAST aware at all times :wink:

Driving ist complex und subject to human decsion making /repsonsibility und skill

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PostPosted: Thu Sep 10, 2009 19:42 
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Weepej said,

Quote:
Average speed.

You take the speeds of the vehicles going down the road and calculate an average.
....


correct and now you can tell me why a road with an average speed of 50MPH is less safe than a road with an average speed of say 26MPH?

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PostPosted: Thu Sep 10, 2009 20:40 
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graball wrote:
correct and now you can tell me why a road with an average speed of 50MPH is less safe than a road with an average speed of say 26MPH?



The "same" road presumably?

See above where I outline a thought experiment that demonstrates that the faster you go the more chance you have of not avoiding something that pops out in front of you.

It's why people slow down.


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PostPosted: Thu Sep 10, 2009 20:55 
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Ball bearing aren't cars driven by people, so show me using stats, some figures that prove roads with a higher average speed have more A/100mkvs

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PostPosted: Thu Sep 10, 2009 20:57 
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Quote:
The "same" road presumably?


Explain how the same road can have different "average" speeds while you are at it.

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My views do not represent Safespeed but those of a driver who has driven for 39 yrs, in all conditions, at all times of the day & night on every type of road and covered well over a million miles, so knows a bit about what makes for safety on the road,what is really dangerous and needs to be observed when driving and quite frankly, the speedo is way down on my list of things to observe to negotiate Britain's roads safely, but I don't expect some fool who sits behind a desk all day to appreciate that.


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PostPosted: Thu Sep 10, 2009 21:24 
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graball wrote:
Quote:
The "same" road presumably?


Explain how the same road can have different "average" speeds while you are at it.


By reducing the limit.


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PostPosted: Thu Sep 10, 2009 21:25 
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graball wrote:
Ball bearing aren't cars driven by people, so show me using stats, some figures that prove roads with a higher average speed have more A/100mkvs


Graball, I've explained before, you can't go comparing motorways or country roads with urban roads in densly populated environments, it makes no sense.


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PostPosted: Thu Sep 10, 2009 21:34 
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weepej wrote:
Graball, I've explained before, you can't go comparing motorways or country roads with urban roads in densly populated environments, it makes no sense.

Therefore, you can't compare 'speeding' on motorways with 'speeding' in densely populated environments, it also makes no sense. :wink:

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PostPosted: Thu Sep 10, 2009 21:59 
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Steve wrote:
weepej wrote:
Graball, I've explained before, you can't go comparing motorways or country roads with urban roads in densly populated environments, it makes no sense.

Therefore, you can't compare 'speeding' on motorways with 'speeding' in densely populated environments, it also makes no sense. :wink:


Did I ever do that?

I'd be happy for motoways to be left out of the discussion altogether frankly, but you and graball keep pulling them back in , graball is particulary keen on trying to assert that because motorways have low incident rates compared to urban roads it must be OK to travel at 70mph through a pedestrianised town centre.


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PostPosted: Thu Sep 10, 2009 23:06 
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weepej wrote:
Steve wrote:
weepej wrote:
Graball, I've explained before, you can't go comparing motorways or country roads with urban roads in densly populated environments, it makes no sense.

Therefore, you can't compare 'speeding' on motorways with 'speeding' in densely populated environments, it also makes no sense. :wink:


Did I ever do that?

Did I say you did?

In fact, despite my repeated questions on the issue, you wouldn’t let yourself be drawn on it.

At least we now know that we understand a fundamental reason for the actual answer, even if one isn’t wiling to admit it.


weepej wrote:
I'd be happy for motoways to be left out of the discussion altogether frankly, but you and graball keep pulling them back in ,

With good reason! One of the original topics of this thread was the (generally accepted) needless limitation of motorway travelling speeds.

weepej wrote:
... graball is particulary keen on trying to assert that because motorways have low incident rates compared to urban roads it must be OK to travel at 70mph through a pedestrianised town centre.

I don't think he said that at all; I suspect you are wilfully misrepresenting what he said to enable you to make his argument seem absurd.

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PostPosted: Thu Sep 10, 2009 23:57 
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Weepej, forget motorways now let's talk about single carriage way roads.

30MPH equals 101 A/100mvkms, NSL equals 45 accidents/100mvkms... can even you not spot the more dangerous roads?

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PostPosted: Fri Sep 11, 2009 06:35 
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graball wrote:
30MPH equals 101 A/100mvkms, NSL equals 45 accidents/100mvkms... can even you not spot the more dangerous roads?


I don't know about Weepje but I can spot that the 30mph limited roads are more dangerous. But to conclude that the increased danger is a consequence of the speed limit is ludicrous. It would be a valid response to your statistic - but not one that I would advocate - to reduce the limit from 30mph to 20mph

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PostPosted: Fri Sep 11, 2009 06:44 
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Steve wrote:
At least we now know that we understand a fundamental reason for the actual answer, even if one isn’t wiling to admit it.



Are you suggesting that ALL roads should be like motorways (no t junctions, no pedestrians, armco down the middle)?

That's practical, (not!).


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PostPosted: Fri Sep 11, 2009 06:47 
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Steve wrote:
weepej wrote:
Did I ever do that?

Did I say you did?


The insinuation that I did is clear.


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