You're right, I think, Brian.
The most accurate indication of speed is probably a GPS readout.
Chris
On 17 Jan 2013, at 12:41, Brian Gray <bsg017@xxxxxxxxxxxxxx> wrote:
> As far as I know car speedometers are actually geared to the rotation
> rate of the wheel. So the accuracy of the speedometer will vary as the
> tyres wear, perhaps by 3% or more over their life. In the UK I note
> with interest that the 'doppler' speed indicators which light up at the
> start of some speed restrictions if you are still over the limit
> generally seem to agree with my speedo reading on newish tyres.
> Brian
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