Safe Speed Forums

See this new page:

http://www.dft.gov.uk/stellent/groups/d ... 10516.hcsp

Someone put in an FoI. (not me this time! )

I have had a quick look and it is remarkable to not that they made absolutely no mention of using the data to reduce vehicle speeds. Their objectives were to invistigate the possibilities of making impact friendly vehicles.

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Paul Smith
Our scrap speed cameras petition got over 28,000 sigs
The Safe Speed campaign demands a return to intelligent road safety

This is interesting:



It's hard to know what the vertical scale represents. I'm still trying to figure it out. Nevertheless it is clear as crystal (and supported in text) that the median impact speed for injury crashes of all severities lies between 20 and 25km/h.

That's between 12.5 and 15.5 mph.

If we were able to include non-reported and non-injury crashes it's as clear as day that the figure would drop much further.

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Paul Smith
Our scrap speed cameras petition got over 28,000 sigs
The Safe Speed campaign demands a return to intelligent road safety

I think the vertical scale is the total number injures. The horizontal scale is the distribution against speed...i.e most fatal accidents occure on the 51 60 km/h band. This is not connected to severity, just frequency.

There is no data that I can see that refers to the reduction in fatalities based on speed reduction from 30 to 25mph (the focus of much hype), only that they have extrapolated the frequency data. By the same token you could say the same about speeds above 61km/h

If this data has been used to justify the speed kill campaign it is a major misrepresentation of the facts....this could get very interesting.

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Speed camera policy Kills

First the 'one third lie' (although some numbnuts are still peddling that one) and now this....

Things are looking up.

Nice to see lovely up to date documents being used (25 years old)

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"Are you sh**ing me?"
"John Spartan, you are fined one credit for a violation of the verbal morality statute."

Looking at it again I can see where the comparison of speed"V"severity come from. If you look at the change in relative percentage of the three severity bands against speed it suggests that the likelyhood of an accident being fatal rather than serious is significanlty increased going from one speed band to another. I think this is taken out of context from the original data but I am not sure how. I am still working on that one. It does contradict the hype regarding the increase in risk of fatality for a 5mph increase in speed.

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Speed camera policy Kills

Those are no more than distribution curves.
Taken at face value, one could say that it's perfectly safe to hit a pedestrian at 100km/h - which is, of course, nonsense.
Also, they are against impact speeds, not free travelling speeds.

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Only when ideology, prejudice and dogma are set aside does the truth emerge - Kepler