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PostPosted: Tue Mar 27, 2007 15:41 
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From a Pistonheads discussion: http://www.pistonheads.com/gassing/topi ... 368168&h=0 (requires free registration)

R_U_LOCAL wrote:
vonhosen wrote:
When training you can drive as fast as it is safe to (just like you can on a call).


That's not quite correct though, is it? Police driver training does carry a speed exemption, but it was decided at a national Police driving school conference a few years ago that advanced training should only go up to a maximum of 90% of the vehicle's top speed. That means that in a car capable of 150MPH, the driver should knock 10% off the top speed, and not go above 135 MPH.

Obviously, this is national guidelines, rather than a legal requirement, but it's another reason why this bobby ended up on a charge.

I replied:

safespeed wrote:
You're kidding right? I hope?

'Top speed' is such a variable thing that any such idea is meaningless.

In order to derive a top speed figure, manufacturers take the average of two runs in opposite directions on a flat test strip.

Anywhere else, with a head wind or a tail wind, up a hill or down a hill, with or without a rev limit, with or without a top speed limit, with colder denser air or with warmer thinner air, with a new engine or one that has done 130,000 miles, with slightly different fuels, differnt loads, different tyre pressures, blue lights on the roof increasing drag, window open or closed and so on... All these things have a marked effect on top speed.

To say '10% less than top speed' is, unfortunately, meaningless drivel.

The discussion continues...

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Paul Smith
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The Safe Speed campaign demands a return to intelligent road safety


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PostPosted: Sat Mar 31, 2007 02:26 
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I have to say Paul, that in these days of the easy availability of "Track days" used increasingly by the general public for "car testing" .. "self training" and "familiarity of the vehicle". That Police drivers still find the need to do it on public roads whilst telling the public that it is: "Unsafe", (for them), to drive at these speeds on public roads.......but they do it anyway, 'cos (Stasi like) they can!....and the "bent" judiciary (no apologies) let them off.



Police "training and familiararity" with their vehicles should clearly take place on tracks........putting the general public at risk is unacceptable.

Now I'm NOT against a much higher speed limit, especially on motorways, and until recently I was against a 2 tier licence.....but!
There is a good arguement here, a very good one, that certain vehicles and drivers should be allowed a higher speed limit by virtue of the vehicle they are driving plus their experience..

i.e. An experienced driver driving a Micra would STILL be limited to 70 mph because the vehicle is clearly incapable of performance at high speed, although I would still not impose electronically limiting the vehicles speed because I believe that "dumb" limiting is dangerous in itself. I would not want to limit these drivers in a situation when a slightly higher speed may be the safer option.
Safety.......is a variable. Insurance Companies take into account these very same variables.......so why can't the law?

For instance, the same driver, driving a high performance car, may safely drive at......? 150 mph? .. (to be decided) if he has the experience etc and an insurance company would reflect this at a reduced premium over an unexperienced driver. But the same driver would recognise the "limitations of the vehicle" when driving the Micra..

A mixture of maybe age, car capability, and driver expertise in my opinion is the answer.
Certainly, the "speed camera" revenue gathering (stealth tax)approach is now totally discredited and will ultimately fail due to public pressure and sites like "safespeed".


Apologies for my slightly alcohol fueled rant there, Paul. But it it Friday!....... :D


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PostPosted: Sat Mar 31, 2007 08:58 
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I would be uncomfortable with such widely varying motorway speed limits. They would intentionally increase the speed differential of vehicles within the carriageway, which is not a desirable situation.


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