|
I'd go with the eyesight problem ;), it seems so should you. Maybe you should look at the text. "two-thirds of cars exceeded the 30 mile an hour limit on urban roads." Now, that does NOT mean "two thirds of all cars on the road are exceeding the limit in 30 zones at any one time" You are assuming that it does mean this, when it doesn't.
I can understand why it would confuse you but you need to think about it. To record speed of a car, you need some form of speed gun, where do they place speed guns? Where it is a common place for speeding and where it is actually **possible** to speed. (They don't place speed guns at traffic lights, or just as you pull out of junctions do they!) Now the accident data is for ALL roads everywhere, anywhere an accident has taken place.
So compare roads, the accident figures are for ALL ROADS everywhere in the UK, whereas the data you've given is the data for those little stretches of road which happen to have a speed camera on it. Can you not see how vastly different those two situations are?
It may be hard to grasp, but a great way of showing you the error is by the fact that using your interpretation, speeding drivers are over three times as safe as non-speeding ones, which is a ridiculous conclusion!
|
|
|