| Re: Why can't car speedos be accurate? |
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Group: uk.transport · Group Profile
Author: PetertPetert Date: Sep 20, 2008 10:15
On Sat, 20 Sep 2008 13:09:53 +0100, "Mortimer" privacy.net> wrote:
>"Petert" googlemail.com> wrote in message
>news:m1o9d4hir57o1ik14bbu1tamjde3dmg8il@4ax.com...>> On Mon, 15 Sep 2008 05:29:39 -0700 (PDT), Boltar
>> yahoo.co.uk> wrote:
>>
>> I suppose one reason is that the radius, or rather, the circumference
>> of the wheels of cars/lorries etc aren't constant. It will change as
>> the tyre wears down and as the pressure of the air inside it
>> expands/contracts/leaks.
>>
>> Perhaps a different means of measuring the speed of a vehicle is
>> needed - perhaps some sort of radar signal bounced off the road below
>> the vehicle?>
>Or maybe laser light, using same technology as for laser mice. Or GPS
>(assuming you can get satellite reception). May be overkill, though ;-)
>
Someone explained to me once that the speed shown by a GPS receiver
isn't necessarliy accurate as you may be driving up or down a steep
hill - the GPS will show your speed as though you were driving along a
flat road
--
Only some ghastly, dehumanised moron would want to get rid of the Routemaster.
Ken Livingstone 2001.
PeterT - "Reply to" address is a spam trap - all replies to the group please
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