On Wed, 9 Apr 2003, Smith, Graham - Computing Technician wrote:
> Generally the error margin worsens as the speed increases.
> At an indicated 70 mph you may only be doing 67 mph. And
> when at an indictated 140 mph you may well only be doing 135 mph.
the error is usually worse than that. eg, 136MPH == 120MPH on quite a
few motorbikes.
> The reason that the speedometers are designed to error in that way
> is to reduce the possibility of law suits against manufacturers
> whereby owners received speeding fines etc believing they were under
> the limit.
its an EU directive (presumably implemented in law across all EU
countries). its illegal to sell cars in EU with speedometers that
indicate than true speed.
> So if the speedometer doesnt behave this way, it's defective and
> that makes it the owners repsonsibility to ensure the car is legal
> as with lighting and tyres etc.
>> Graham.
regards,
--
Paul Jakma Sys Admin Alphyra
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