Safe Speed Forums

That's interesting, especially the following:

Reducing anything by more than 100% is very impressive

I had something similar happen to me on the M6 a few years back, but in my case the accelerator cable snapped, while in lane 3. After a split second while the problem registered I hit the hazard light switch. I also had a passenger who made the decision to drop his window and use the up and down arm movement to indicate we were slowing down.

We got over to the hard shoulder with out any problems, the road was busy but not as busy as it could have been seeing as it was a Friday at about 5pm.

How is this possible, without going into a negative collision rate, whatever that might be.

The conventional definition is 100% * (X2 - X1) / X1, which for -200% would require a negative collision rate.

The only way I know is to use the logarithmic definition of percentages.

percentage = 100% x Natural-Log(X2 / X/1)

-200% means that X2 is 0.1353 times X1, or a reduction of 86.5% by the conventional definition.

For small changes this produces the same results as the conventional method, but is much better when large changes are being considered, such as occur in some engineering calculations

A good interim method for reasonably large changes is 200% * (X2 - X1) / (X2 + X1), which is the first term of the Taylor expansion series for the logarithmic version, but for -200% that would give the result that X2 = 0
.

Best advert i saw regarding road safety and speed was this one from wmfs.net, cant find a photo of it but the text went thusly:

"Check your driving. Attitude and speed dont mix."

How much more sensible is that compared to the "speed kills" nonsense being espoused by the likes of weepej et al?

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"Safety" Scamera Partnerships;
Profitting from death and misery since 1993.

Believe nothing- Question everything.

An improvement would be:
"Check your mindset. Poor attitude and driving don't mix."

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Prepare to be Judged