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Spinning Speed Camera Stats


Article by: rob brady
Date: 28 Aug 2011

pocketgpsworld.com
Benjamin Disraeli famously said: "There are three kinds of lies: lies, damned lies, and statistics."

The Department for Transport (DfT) released figures earlier in the week which gave details of the perceived effectiveness of some speed cameras. These figure were drawn from local authorities who recently started publishing data on accidents and casualties on particular stretches of road before and after the installation of speed cameras in their particular areas.

The national press picked up on this with headlines from The Telegraph such as "Speed cameras fail to cut accidents" and "Speed cameras do not cut accidents... they create them, study finds" from the Daily Mail. It wasn't a study by the way, it was just a release of simple data.

However, some may feel that the Guardian have produced a more measured reaction to the story headlined: "So speed cameras can cause accidents? The maths just doesn't add up".

They argue that, statistically speaking, random factors could lead to a situation where the number of accidents increase after the installation of a speed camera saying "This will happen even if the probabilities of an accident happening have actually gone down".

Over the years, there's been a lot discussion about the regression to mean effect and randomness when it comes to speed camera statistics- usually from those trying to proving the speed cameras don't work. It's interesting to find an argument that attempts to prove that these factors have a part to play in explaining why cameras are effective overall even if they don't appear to work in certain places.

   
 
Comments
Posted by JimmyTheHand on Sun Aug 28, 2011 12:51 pm Reply with quote

"What is sauce for the goose is sauce for the gander." - if the speed camera industry uses statistics in a naive way to justify them then they should expect the same back


J.

 
Posted by mostdom on Tue Aug 30, 2011 6:50 am Reply with quote

Sensationalized headlines from the Mail and telegraph. Obviously couldn't help themselves!


Dom

HERE LIES PND May it rest in peace.
Navigon 7310/iPhone Navigon&Copilot

 
Posted by JQL on Fri Sep 02, 2011 9:17 am Reply with quote

The Gaurniad is biased as well. The Maths does add up.

Case in point. About one month ago, following an out-of-town car at about 5mph below the posted speed limit, on a dual carriageway, when the driver spots a TAX camera. So what does he do?

Slams on his brakes and I mean slam them on. His speed drops by nearly 50% to below 40mph! As I was riding my motorcycle, I had no problems slowing down. The car driver behind me though, nearly rear-ended me. I only avoided being rear-ended by lane-splitting (luckily the middle lane had sufficient space to do this).

This is not the first time it has happened to me and, when it happens again and, if I do get hit (and survive), I will be suing whoever installed the camera and its operator.

TAX Cameras, for the most part, are dangerous, revenue generating devices and only a very small number are actually safe or for safety.

What is needed is a visible Police presence. That's much more effective at slowing drivers down.


John

E-TEN M700 with TomTom

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