Re: Why can't car speedos be accurate?
Group: uk.transport · Group Profile · Search for wearing in uk.transport
Author: Petert
Date: Sep 20, 2008 10:15
...0700 (PDT), Boltar <boltar2003@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 ...
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