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PostPosted: Tue Feb 21, 2006 22:09 
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ndp wrote:
Agreed *but* sometimes a road environment can be such where even to higher-level drivers are unable to properly determine the appropriate speed (the very best may well work it out - but as you say not all drivers will be advanced drivers). You can try to rectify this by warning of a hazard, or by otherwise altering the road environment to encourage the appropriate response - but if that doesn't work, then legislative requirements are imposed. And if drivers don't respond to them, enforcement may be necessary to encourage them to respond appropriately.


Care to give an example of the above? I can see circumstances where a hazard (e.g. a junction or farm entrance) may be concealed and the road character and layout otherwise conducive to traffic speeds that could result in real danger of collision if 'unfortunate' circumstances combine. That would be a case for special treatment, where road engineering is not a practical alternative. Is that the sort of case you had in mind?

Generally, we seem to agree on more than we disagree. Indeed, it's the tragedy of the debate between speed camera proponents and opponents that the participants become entrenched in defending narrow issues (sometimes, as you noted, taking absurd positions) instead of searching for the (probably substantial) common ground and building on that.

BTW, you still haven't answered the question.


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PostPosted: Tue Feb 21, 2006 22:21 
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PeterE wrote:
Yes, but you can only tell how effective the cameras are if you can compare results from two broadly similar sites.


You can, but there is nothing to suggest on Paul's page that that has occured. its just "roadworks", with no regard for the nature of the works and inflows.

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Otherwise it is simply a matter of blind faith.


In practise, finding control sites is easier said than done (for a start, people tend to complain if they notice remedial measures being withheld from the control site).

Having found a problem site where the accident rate is greater than the expected level for the given link/junction type and inflows, and found a potential solution after all the investigation to determine how/why drivers are failing to cope with their environment, and to establish what trend the accident rate is following and that a recent spike isn't simply random fluctuation or due to existing measures wearing out (literally or otherwise) one then tries the solution to see if it delivers an improvment.

The point about flows and the nature of the works is that if cameras are used in works where the expected accident rate is higher than where the cameras aren't used, then the cameras could still be improving things despite non-camera works having a lower accident rate.


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PostPosted: Tue Feb 21, 2006 22:29 
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Observer wrote:
ndp wrote:
Agreed *but* sometimes a road environment can be such where even to higher-level drivers are unable to properly determine the appropriate speed (the very best may well work it out - but as you say not all drivers will be advanced drivers). You can try to rectify this by warning of a hazard, or by otherwise altering the road environment to encourage the appropriate response - but if that doesn't work, then legislative requirements are imposed. And if drivers don't respond to them, enforcement may be necessary to encourage them to respond appropriately.


Care to give an example of the above?


One example would be a signalised junction where intergreens had been reduced to provide additional capacity.

Another would be where a road has been designed so that it has certain parameters with a design speed but other parameters have a higher design speed (not good design, but common in the 1980s rush for capacity). This can result in the environment being suggesting a higher speed is appropriate than actually is.

Another would be the A14 - a road which in places is fully dualled, GSJed, with access control - and then dumps onto what is little more than a single carriageway rural road with another carriageway built alongside with some bends straightened out etc. - but with no apparant change in the road characteristics, hence people treat all sections like the good bits.


Quote:
I can see circumstances where a hazard (e.g. a junction or farm entrance) may be concealed and the road character and layout otherwise conducive to traffic speeds that could result in real danger of collision if 'unfortunate' circumstances combine. That would be a case for special treatment, where road engineering is not a practical alternative. Is that the sort of case you had in mind?


Thats a fair case (though speed limits aren't too good for isolated hazards - you can't enforce them, you get "see-through" issues etc)

Quote:
Generally, we seem to agree on more than we disagree. Indeed, it's the tragedy of the debate between speed camera proponents and opponents that the participants become entrenched in defending narrow issues (sometimes, as you noted, taking absurd positions) instead of searching for the (probably substantial) common ground and building on that.


Agreed.

Quote:
BTW, you still haven't answered the question.


I messed up the quoting so it may not have been clear it was an answer to your question, but I did say this:

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Of course being a traffic engineer doesn't make one an advanced driver, nor vice versa.


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PostPosted: Tue Feb 21, 2006 22:32 
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PeterE wrote:
ndp wrote:
The questioning of the use of terms "road engineer" earlier in the thread was not sensitivity on my part - I was merely wished to find out why those who claimed to know so much about traffic engineering where using such unusual terms

Is it not perhaps a useful portmanteau term to include both highway engineers and traffic engineers (who do complementary but different jobs)? :D


Its one that I suspect has just been invented ;)

And I suspect signals engineers, street lighting engineers, bridge engineers etc would be aggrevied to be left out ;)


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PostPosted: Wed Feb 22, 2006 00:04 
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ndp wrote:
PeterE wrote:
Yes, but you can only tell how effective the cameras are if you can compare results from two broadly similar sites.

In practise, finding control sites is easier said than done (for a start, people tend to complain if they notice remedial measures being withheld from the control site).

In actual fact control site data may already exist in Cumbria. IIRC, there was a discussion on the now defunct Cumbria Safety Camera Partnership forum where the Partnership manager admitted that they had the data to allow for a comparison between sites selected for a camera and others which were not. They refused to release the data though. Wonder why? :scratchchin:

I'm getting all nostalgic now. :D

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PostPosted: Wed Feb 22, 2006 00:10 
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ndp wrote:
PeterE wrote:
ndp wrote:
The questioning of the use of terms "road engineer" earlier in the thread was not sensitivity on my part - I was merely wished to find out why those who claimed to know so much about traffic engineering where using such unusual terms

Is it not perhaps a useful portmanteau term to include both highway engineers and traffic engineers (who do complementary but different jobs)? :D

Its one that I suspect has just been invented ;)

And I suspect signals engineers, street lighting engineers, bridge engineers etc would be aggrevied to be left out ;)

They're welcome to the party :lol:

And, as you know, a mutual acquaintance used the term "road engineer" this very evening :P

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PostPosted: Wed Feb 22, 2006 01:50 
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ndp wrote:



Not just out of piste, but out of resort


So where do you like to ski? 8-) Have been to a number of places – and I do join my Swiss cousins in cross-country and so on. :lol: But you always have and need a guide :wink: – the Swiss have a nasty habit of charging you for rescues if you were at fault


(am fortunate :D and unfortunate :twisted: in having a certain “riff :evil: raff” element related to me… They are jolly useful when it comes to “holidays” though :lol: 8-) )

Quote:
me wrote:
]
But in any case - you lose a ski in slalom and I believe the breakages are just a bit on the very severe side. (Cousin of mine - Wildy's sister - competed in this sport as youngster.)



Of course, but as I say it’s limiting the risks. You never remove the risk.


But as Kriss tells me (she took a bronze in her event once because someone else fell) - the skiers start to adjust and decelerate as they near the end of the run – as colliding with netting hurts…

Me wrote:
But in general - most drivers assess and gauge traffic and speed well enough to negotiate and blend in the flow of traffic. We do this when walking in a crowd or cycling or riding en groupe as well. Humans have this extraordinary brain/eye/hand/body co-ordination skill and as we gain expertise and practice - so it sharpens.


ndp wrote:
Of course, and that’s why accidents are rare and random.


And precisely why claiming a speed camera will stop accidents or even change behaviour is such an absurd claim. :wink: :roll:
Quote:
IG wrote:

But fining jay-walkers - no one complains in the countries (including some USA states) - and why would environmentalists be up in arms about fining jay walkers who saunter and moon walk across roads. I'd be inclined to serve these moon walkers and deliberate dawdlers in the road with an ASBO, as this loitering is really what it is...



Alas, the merits of their arguments are neither here nor there in democracy. Its simply whose voice is loudest.


Their democracy has been in favour of this. It stops silly accidents and explains why less pedestrians and cyclists are killed on the roads. Continental countries have many more road traffic accidents than here overall per their statistics – and Germany appears to show greater proportion of incidents in the former GDR due to really awful roads and badly trained pre-unification drivers, coupled with drivers from other equally badly trained former Soviet controlled drivers. Cobbled streets also play their part – and significantly there are some emerging worries that people underestimate danger in the very low speed areas.

IG wrote:
Jay -walking is different. It is a form of anti-social behaviour - if a deliberate act of trying to force traffic to stop.



Well yes, if it is.[/quote]

There is no “if” – If the person deliberate steps out into the road and moon walks – that is “anti-social” :roll:

Apart from that - I do not deliberately get under someone else’s feet when walking in shops or anywhere else – and I do hold doors for people. It’s called courtesy and consideration to others.

Causing someone to alter course by deliberately getting in the way is just downright rude behaviour. :roll: If they do so in front of moving vehicles including bicycles and horses – plain dangerous ::banghead: as well as stupid and irresponsible.

The fact that Swiss. Germans, Austrians, some Americans States and a couple of other European countries fine for this promote responsible and safe behaviour by all.

It is certainly no less fair than fining a driver and potentially removing his livelihood and giving him a record if he appeared before magistrates over four marginal blips for which police would use a better and more rounded professional judgement

What’s good for the goose :wink:

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Quote:
Of course it - and we also play fair when dealing with incidents involving cyclists - and we do know what the "cyclists who have never heard of Cycle Craft of Highway Code or any internet site" do at red lights and one ways....



There seems to be a double standard here


What double standard? :?

We would do any one who ignores a red light. :wink: Just because they are on a bike does not matter. Jump a red and you are clearly in breach of the law – whatever you are driving or riding. :wink:

The double standard apples when cyclists tell me a driver should be fined for this :roll: – yet it’s OK for them to do so. :?

Nope. :nono:

We do fine people here – for running reds and behaving like :censored: dangerous half wits. :twisted:


Bit of a myth that we don’t ….But at least – people know exactly why they were told off or prosecuted – and for this reason – we appear to beget respect from all. :wink:

Quote:
If an experienced driver knows that a certain speed is safe for the circumstances he would be very unlikely to be affected by misapplied policing.


(From http://www.safespeed.org.uk/speeding.html )

Now I appreciate that (presumably) Paul wrote that and not yourself, but should cyclists be able to pass through red signals, or cycle against a one-way street if they know its safe without "being affected by misapplied policing"?


Big difference – if a cyclist amber gambles – they have not the acceleration power and one-way streets? All drivers and other riders expect and PEDESTRIANS expect the traffic to be approaching from one direction.

Speed – they can judge within reason – but if a traffic signal is on green for an approaching car and some idiot goes through on a red – moving traffic offence, careless and dangerous driving are things we will go for :roll: – and I can think of any number of public order charges to ban a cyclist to rights over this and provide sufficient ammo for CPS to hold water :twisted: Have done so in the past and can do so again. :twisted:

Quote:
Not that anyone ever knows anything of course - they only think they know.


:? :?
They know “red means stop and No Entry means NO!” and that there is a greater degree of danger in this than blipping over a speed limit and being able to stop safely in distance they can see to be clear. :wink:

Bit COAST drivers and cyclists have more self-respect and pride in their drives and rides to do this. :wink: 8-)



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Quote:
Decent cycle facilities? Or the crappy 1.3m cycle lanes that run in the gutter with the drains, deteriorating surface and such? Or the off road paths with the bumbling pedestrians, broken glass, and giveaway lines at every junction if you're lucky, or at every private access if you're not?



Oh - if you want awful cycle lanes - I gather the Mad Doc has locked his "Stag" horns with some bloke in his local Council over the ones in the Lakes. Gather the firm commissioned to do the paint job wanted the instruction in written triplicate before they started.

Sure some are dreadful and so badly planned by road planners that one wonders if whoever designed them has half a brain cell.


Some of it is certain groups insisting there should be a cycle lane, or tokenism from developers or whatever. The engineers (usually) know when they're not up to task, but don't necessarily get the final say. [/quote]

Of course there are targets – why some of these lanes are a sick joke and those responsible should be strung up over it. But then again – you are up against these same town hall twits who decide speed limits, humps and so on because “it’s political correctness for them to do so”

Quote:
.
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Most of the problems is about trying to do things on the cheap - camera preoccupation is one of them



The vast majority of remedial measures don't involve cameras, so I don't think that statement isn't especially fair.


Perhaps – but then it seems to be the case in many areas these days – and certainly not enough attention is paid to other areas of road safety. Besides - we had a most unfair press over our little blip and opur stance on the subject of pratnerships...and even though we had a "bad" year for crashes - we still had less than the places wioththe cameras a= - and still do ... :wink: We are trying to reduce them further - we have a little headache with middle aged wannabe Hell's Angels though... :roll: in one little area... :roll:

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It's called wasting our money and I may get my salary courtesy of Joe the Public Tax Payer - but at least I try to earn it by delivering the sort of service required - and this per my colleague West Mercia's CC in a press interview - means being accountable, accessible and visible


Of course, its all very well highlighting waste as an issue - but what do you do about it?


As stewards of taxpayer’s cash – we have an obligation to provide a value for money service. In some ways – we deliver here by prudent down to earth deployment of staff and expenses and no gimmicks – such as “recipe books for doughnuts and – er – a guidebook telling me I must refer to some pals of mine (one right short crust tub of lard :lol: - and one – more than a bit tall :lol: :o and he does look a sight on my 70s icon bike (my trusty Chopper of my early teens)) as “height challenged” :roll:

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Besides .. 33 mph - a non-starter as cambers and tyres affect speed fluctuate and no human can keep steady - try a freewheel on a bike on a downward gradient. It picks up speed very gradually. Also speedos are not that accurate. You do not nit pick over silly blips - makes bad law and bad justice. Common sense applies and we do allow a fair tolerance and we judge on what is actually seen.



Whilst that is true, it is important to recognise that the speed limit is a limit, and nothing more. You don't have to drive at 30 in a 30, indeed its a good idea to drive a little slower than the limit to largely (though obv not entirely) ensure that any upward drifts don't exceed the limit (and if they do they do so to a lesser degree).

But we have roads with limits higher than 30 mph and motorways – very easy to exceed on a simple overtake – simply to get out of trouble.

We judge accordingly as drivers. But it does not matter how fast or slowly a driver drives - the other road user still has to judge a speed of approach and only cross or move to a primary when it is safe to do so. Thus all parties have a responsibility to COAST it.
Most COAST drivers will be blipping up to 3 under and over as constant. :wink:


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The roads I have in mind - have no hazards.


No road has no hazards


I can name one near here – no residents, no crossings and very slight bends. :wink:

Quote:
Quote:
Yet there is a 50 mph road which is residential around here ....



Well there are shades of residential - even sections of the A1 have residential frontage


Like the A6 and A19 and A55… when they run though towns – but when they enter the rural or have motorways status for some distance…. (A1 M/A57 (M) etc. :wink:

These are main trunk backbone roads, which link the networks when all’s said and done. But I am talking of a road which has houses on each side and one school and some shops – and another road – 30 mph and field on each side…field where cattle graze and barbed wired and wooden fences and hedge-grows prevent straying animals – and the open plan NSL with the suicidal sheep…. :roll: and never underestimate the dangers of a "road kill" on this one. Matter of more than mint sauce... :wink:

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Quote:




I can't comment on the specific examples you give, I don't know the roads. But it is important that limits are consistant with the road environment and each other as far as is possible. Limits which are apparently inconsistant with the road environment are sometimes a necessary evil - however, where the justification doesn't exist they do alot of harm IMV.

Ah.. but far too often - no more thought is given to a situation other than reduce a speed limit and enforce with a camera



I don't think thats fair, at least, not until the public or their representitives get involved - but thats the catch of democracy


But I don’t choose who represents these parties – they are foisted on us. And they are not road experts or even drivers or riders either.. :wink:

But then there is a saying

Those who can – DO

Those who cannot – opt for POLITICS and proof of their ineptitude is apparent across the globe

It should also be noted that the Ministers all want us to buy them a Jag “because it can accelerate out of danger faster than the cheaper eco-friendly Prius.” :roll:

Hmmm speed kills all but Cabinet Ministers then :scratchchin:

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PostPosted: Wed Feb 22, 2006 04:31 
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Now you have completely lost my interest because you are not conducting an honest discussion. If you want to explore the road safety information then you will have to answer simple questions honestly and provide supporting reference sources when required.

ndp wrote:
Quote:
Now if you really want to continue the conversation, please go back to this post and make a fair stab at answering it properly.


Its not a question of the data being "strange", it is the assumption that all accidents where excessive speed and/or exceeding the speed limit will have this cited as a contributory factor, and that by implication excessive speed and/or exceeding the speed limit isn't a factor when it isn't cited.


No such assumption is required.

ndp wrote:
As I say, how do you explain the accidents with no contributory factors cited?


Information wasn't available when the form was filled in. Of course that helps to make the data stronger because forms aren't routinely filled in when insufficient data is available.

You can pretend the data is wrong as much as you like, but until you have evidence or analysis that shows it is wrong you're just blowing hot air.

So, please, please, please stop messing about and get to grips with the questions. Unless you do this'll be my last reply.

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PostPosted: Wed Feb 22, 2006 08:42 
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ndp wrote:
How have they imposed "artifical congestion"?

How many examples do you want?

Putting in chicanes narrowing the road to one lane and alternate priority

Filling in bus stop laybys, so buses have to stop in the inside lane

Changing free-flowing road layouts to near grid-lock layouts

Changing free-flowing junctions

If ever you're down this neck of the woods let me know - I'll show you!

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PostPosted: Wed Feb 22, 2006 19:30 
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SafeSpeed wrote:
Of course that helps to make the data stronger because forms aren't routinely filled in when insufficient data is available.


Do you think that officers revist the forms for every accident?


SafeSpeed wrote:
Unless you do this'll be my last reply.


Thats a very convenient way of refusing to acknowledge my points regarding the flaws in your simplistic analysis of accident severity in 20mph zones and accident rates in motorway roadworks where speed cameras are deployed.


safeSpeed wrote:
blowing hot air.


As are you when you don't properly consider the impacts of inflows and the nature of traffic management when analysing the effects of speed cameras in roadworks.

Unless of course you have, in which case you are more than welcome to post this analysis.


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PostPosted: Thu Feb 23, 2006 00:22 
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NDP, forgive me for pointing out this oversight so publicly, but in quoting Paul, you apear to have missed the sentences, and only quoted a few words of each.
They ACTUALLY read:
Quote:
You can pretend the data is wrong as much as you like, but until you have evidence or analysis that shows it is wrong you're just blowing hot air.

So, please, please, please stop messing about and get to grips with the questions. Unless you do this'll be my last reply.


I think you watch too much Jeremy Paxman, and let his style influence your posting. :lol:

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PostPosted: Thu Feb 23, 2006 00:35 
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Ernest Marsh wrote:
NDP, forgive me for pointing out this oversight so publicly, but in quoting Paul, you apear to have missed the sentences, and only quoted a few words of each.
They ACTUALLY read:
Quote:
You can pretend the data is wrong as much as you like, but until you have evidence or analysis that shows it is wrong you're just blowing hot air.

So, please, please, please stop messing about and get to grips with the questions. Unless you do this'll be my last reply.


I think you watch too much Jeremy Paxman, and let his style influence your posting. :lol:


A fair comment perhaps - however as I'm sure you can understand I am troubled by Paul's failure to acknowledge my concerns with his reasoning for some of his bolder statements - hence the perhaps assertive style to try and see these concerns acknowledged and eased.


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PostPosted: Thu Feb 23, 2006 02:42 
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ndp wrote:
Ernest Marsh wrote:
NDP, forgive me for pointing out this oversight so publicly, but in quoting Paul, you apear to have missed the sentences, and only quoted a few words of each.
They ACTUALLY read:
Quote:
You can pretend the data is wrong as much as you like, but until you have evidence or analysis that shows it is wrong you're just blowing hot air.

So, please, please, please stop messing about and get to grips with the questions. Unless you do this'll be my last reply.


I think you watch too much Jeremy Paxman, and let his style influence your posting. :lol:


A fair comment perhaps - however as I'm sure you can understand I am troubled by Paul's failure to acknowledge my concerns with his reasoning for some of his bolder statements - hence the perhaps assertive style to try and see these concerns acknowledged and eased.

I can only speak from experience of the situation in Cumbria, while Paul sees a much wider picture.

Locally, the partnership rules have allowed the establishment of a mobile camera site, where the accidents used to justify the cameras, are outside of the limit area monitored, AND were not related to vehicle speed, but medical emergencies (heart attack at the wheel).
Accidents continued to take place - outside the monitored site, (but within the prescribed distance either side) and with none of the vehicles exceeding the prescribed limits, but guilty of careless or dangerous driving (and one mechanical failure) and one drunken pedestrian who thwarted all efforts to avoid him.
Fixed cameras are now in place, BUT accidents continue either side of the site, including one just outside the area a couple of weeks ago, where an 18 year old lost his life - possibly through his own actions. THIS stretch of road was reported to the Safety Camera Partnership by myself, and surveyed by them - only to report (as I already knew) that exceeding the speed limit was not a problem, just BAD driving.

Over a three year period, the SCP have collected revenues from motorists who exceeded the speed limit on a stretch of road which previously had a 60 limit, now 40 mph, yet have made NO difference to the accident rate - indeed have seen accidents increase as motorists race away from the camera site to "make up for lost time".

The Partnership are so embarrassed at having the causes of accidents they claim to be reducing called for inspection, that they refused a FOI request from the local paper to see the accident causation figures.
I recently received the results of an FOI request, when in the paper the SCP claimed to have reduced accidents by 70%, when the figures on THEIR website showed a reduction of at best 7%.
I suggested they had been misquoted, but no, they claimed that between Jan.1999, accidents at core sites had reduced by 72%.

However, the camera partnership was only formed in 2003, so four years of falling figures (without the aid of cameras) were added to the minute fall THIS year (they rose last year) and reported as a 72 % fall attributed (by themselves) to the use of Safety Cameras!!!
Twisting and misrepresenting statistics is a full time job for three managers in Cumbria. A good proportion of the money they raise is spent on them and their cameras!!
Their whole reason d'etre is to deflect criticism of the council and police for a poor safety record, appease inexperinced residents who call for speed cameras evertime an accident occurs in their village, and collect revenue while doing it.
In the meatime, young drivers continue to die in Cumbria with just a few leaflets to try and discourage them!
Check out the CSCP threads on this site, for a background to the affair!!

Remember, that of all the motorists the SCP penalised for speeding, NOT ONE of the drivers concerned was stopped, and prevented from continuing onwards in such a reckless fashion!! They even complained of drivers passing their site on the M6 in fog, so dense they could not record the numbers of the offenders.... at up to 70 mph in a 50 limit (for roadworks)
Those drivers should have been STOPPED for all our safetys sakes!!

Partnership Rules are written with one thing in mind - to justify the placement of a robotic means of recording an offence.
Nobody needs to be stopped and held up - you simply pay a small toll a couple of weeks later, and in the meantime you can continue on your way.
HARDLY SAFETY CAMERAS when they fail to prevent a known crime taking place!!

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PostPosted: Thu Feb 23, 2006 07:32 
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ndp wrote:
Thats a very convenient way of refusing to acknowledge my points regarding the flaws in your simplistic analysis of accident severity in 20mph zones and accident rates in motorway roadworks where speed cameras are deployed.


I don't do crap like that.

ndp wrote:
As are you when you don't properly consider the impacts of inflows and the nature of traffic management when analysing the effects of speed cameras in roadworks.

Unless of course you have, in which case you are more than welcome to post this analysis.


http://www.safespeed.org.uk/trl595.html
http://groups.yahoo.com/group/SafeSpeedPR/message/80

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SafeSpeed wrote:
ndp wrote:
Thats a very convenient way of refusing to acknowledge my points regarding the flaws in your simplistic analysis of accident severity in 20mph zones and accident rates in motorway roadworks where speed cameras are deployed.


I don't do crap like that.


I would suggest that simply reposting the links to the analysis I have raised concerns with without addressing those concerns *is* doing "crap like that".

Quote:
ndp wrote:
As are you when you don't properly consider the impacts of inflows and the nature of traffic management when analysing the effects of speed cameras in roadworks.

Unless of course you have, in which case you are more than welcome to post this analysis.


http://www.safespeed.org.uk/trl595.html


It appeas you have failed to consider the implications of differences in the nature of roadworks and inflows through the roadworks.

For instance, one would expect a set of roadworks which consist of a closed hard shoulder on the M45 to have a lower accident rate than the recent M25 widening works with its complex traffic management, regardless of any limits of cameras. If the M25 works had cameras but the M45 works didn't, it would therefore be foolish to assume this is due to the deployment of cameras - yet this appears to be what you have done by making a simplistic comparison between "roadworks without cameras" and "roadworks with cameras".


Quote:
http://groups.yahoo.com/group/SafeSpeedPR/message/80


Which fails to address the fact that any injury-only accidents which are reduced to damage-only accidents by the 20mph zone (or anything else for that matter). Thus reductions in the severity of would-have-been-injury accidents actually result in an *increase* in accident severity by your measure. This is patently absurd.


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PostPosted: Thu Feb 23, 2006 20:12 
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ndp wrote:
Which fails to address the fact that any injury-only accidents which are reduced to damage-only accidents by the 20mph zone (or anything else for that matter). Thus reductions in the severity of would-have-been-injury accidents actually result in an *increase* in accident severity by your measure. This is patently absurd.

But surely we would also expect a commensurate reduction in K to SI and SI to I, although obviously the same size for more severe accidents will be small.

Are there any road safety statistic that you do consider to be robust, or is it all a matter of faith?

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PeterE wrote:
ndp wrote:
Which fails to address the fact that any injury-only accidents which are reduced to damage-only accidents by the 20mph zone (or anything else for that matter). Thus reductions in the severity of would-have-been-injury accidents actually result in an *increase* in accident severity by your measure. This is patently absurd.

But surely we would also expect a commensurate reduction in K to SI


Yes (though this would have no affect on Paul's measure of accident severity).

Quote:
and SI to I, although obviously the same size for more severe accidents will be small.


Again, yes.

However, as I have said accidents are rare and random - and KSI accidents are even more so. Given this and the (relatively) small populations of 20 zones and accidents within 20 zones, its difficult to draw too much of a conclusion from the statistics alone.

Quote:
Are there any road safety statistic that you do consider to be robust, or is it all a matter of faith?


Neither - the point is to use statistics with due caution.

As I said earlier, the statistics provide pointers as to what further investigations may be worthwhile. But you have to carry out those further investigations to get an idea of what is happening.


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PostPosted: Sun Feb 26, 2006 17:21 
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ndp wrote:
Agreed *but* sometimes a road environment can be such where even to higher-level drivers are unable to properly determine the appropriate speed (the very best may well work it out - but as you say not all drivers will be advanced drivers). You can try to rectify this by warning of a hazard, or by otherwise altering the road environment to encourage the appropriate response - but if that doesn't work, then legislative requirements are imposed. And if drivers don't respond to them, enforcement may be necessary to encourage them to respond appropriately.

But I would suggest the examples where the road environment is genuinely deceptive, although they do exist, are relatively few - one could be where what is apparently a tree-lined rural road conceals a lot of entrances to large private houses.

In the vast majority of cases, this is not the reason for reducing speed limits - it is a kneejerk response to a perceived safety problem, and the type of road environment is entirely obvious.

In every limit above 30 you can probably find an isolated hazard or two that might be used to justify a reduction, but speed limits should not be set for isolated hazards but for the generality of hazard density along the stretch of road.

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PostPosted: Sun Feb 26, 2006 18:46 
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PeterE wrote:
ndp wrote:
Agreed *but* sometimes a road environment can be such where even to higher-level drivers are unable to properly determine the appropriate speed (the very best may well work it out - but as you say not all drivers will be advanced drivers). You can try to rectify this by warning of a hazard, or by otherwise altering the road environment to encourage the appropriate response - but if that doesn't work, then legislative requirements are imposed. And if drivers don't respond to them, enforcement may be necessary to encourage them to respond appropriately.

But I would suggest the examples where the road environment is genuinely deceptive, although they do exist, are relatively few - one could be where what is apparently a tree-lined rural road conceals a lot of entrances to large private houses.

In the vast majority of cases, this is not the reason for reducing speed limits - it is a kneejerk response to a perceived safety problem, and the type of road environment is entirely obvious.

In every limit above 30 you can probably find an isolated hazard or two that might be used to justify a reduction, but speed limits should not be set for isolated hazards but for the generality of hazard density along the stretch of road.


Ist true :yesyes: We have one or two road around here which are NSL - then we have less than half mile of 40 mph - A591 past Grasmere - we have about three such ones. Given the layout - the junction, the pub und the lay-by with the scenic view...I think it would be better to have the whole mile und bit at 40 mph instead of this rather silly situation....

Why I do not suggest upping to NSL ist because of the pub und the turning out of Grasmere .. (ist the one after the mini roundabout which lead to car park und Dove Cottage )

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