T
The Luggage
Guest
On 13 Apr, 14:21, JNugent <[email protected]> wrote:
> [email protected] wrote:
> > On Sat, 12 Apr 2008 20:52:31 +0100, JNugent <[email protected]> wrote:
>
> >> Colin Reed wrote:
> >>> "JNugent" <[email protected]> wrote in message
> >>>news:[email protected]...
>
> >>> This is an oft quoted "guideline" that seems to be regularly denied by
> >>> police spokesmen when talking about speeding.
> >> That's odd.
>
> >> ACPO doesn't "deny" it. They promote it, not least on their website.
>
> >>> Do you actually have any
> >>> cite to show that this is an "official policy"?
> >> <http://www.acpo.police.uk/asp/policies/Data/speed_enforcement_guideli...>
>
> >> See page 6.
>
> >> The published margins are, of course (as I suspect you already know),
> >> related to the legal requirements for accuracy of speedometers, with a
> >> tiny bit added on for a safety cushion.
> > The published margins are not related to the legal requirements for
> > accuracy of speedometers.
>
> Except for the fact that they are both 10%, you mean?
Except that they are not. The relevant allowable tolerance for
speedometers is ZERO. As m ellis has already posted, and you snipped,
a speedometer must not underread. So if your speedo reads 70 mph, your
actual speed will be between 63 and 70.
> Yes - we know that there's another 2mph added to the prosecution
> tolerances, but that is on top of the 10%.
>
> Why, in your opinion, are these tolerance levels applied? I'm not aksing
> you whether you think they *should* be applied, only why they are applied.
I'm not the OP, but I think they add 10% and 2 mph because they know
they would have far too much work on their hands collecting the fines
and dishing out the points if they set it any closer to the limit.
TL
> [email protected] wrote:
> > On Sat, 12 Apr 2008 20:52:31 +0100, JNugent <[email protected]> wrote:
>
> >> Colin Reed wrote:
> >>> "JNugent" <[email protected]> wrote in message
> >>>news:[email protected]...
>
> >>> This is an oft quoted "guideline" that seems to be regularly denied by
> >>> police spokesmen when talking about speeding.
> >> That's odd.
>
> >> ACPO doesn't "deny" it. They promote it, not least on their website.
>
> >>> Do you actually have any
> >>> cite to show that this is an "official policy"?
> >> <http://www.acpo.police.uk/asp/policies/Data/speed_enforcement_guideli...>
>
> >> See page 6.
>
> >> The published margins are, of course (as I suspect you already know),
> >> related to the legal requirements for accuracy of speedometers, with a
> >> tiny bit added on for a safety cushion.
> > The published margins are not related to the legal requirements for
> > accuracy of speedometers.
>
> Except for the fact that they are both 10%, you mean?
Except that they are not. The relevant allowable tolerance for
speedometers is ZERO. As m ellis has already posted, and you snipped,
a speedometer must not underread. So if your speedo reads 70 mph, your
actual speed will be between 63 and 70.
> Yes - we know that there's another 2mph added to the prosecution
> tolerances, but that is on top of the 10%.
>
> Why, in your opinion, are these tolerance levels applied? I'm not aksing
> you whether you think they *should* be applied, only why they are applied.
I'm not the OP, but I think they add 10% and 2 mph because they know
they would have far too much work on their hands collecting the fines
and dishing out the points if they set it any closer to the limit.
TL