From: Brenton 
Reply-To: Brenton , Fidonet AVtech Echo
	

BV> but it does not make any reference to showing
BV> any speed higher than you are actually travelling.
             ^^^^^^
JS> You mean lower?  ..[]..

Yeah, I knew what I meant :)

Actually, I've found the relevant regulation ...

This is covered by :

ROAD TRANSPORT (VEHICLE REGISTRATION) REGULATION 1998
- SCHEDULE 4

http://www.austlii.edu.au/au/legis/nsw/consol_reg/rtrr1998478/sch4.html

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41 Speedometers

Every motor vehicle (not being a trailer) manufactured on or after 1 July 1974
and capable of being driven at a speed in excess of 40 kilometres per hour on
a level road must be fitted with a speedometer that must:

(a) indicate the speed at which the vehicle is being driven in kilometres per
hour, and

(b) indicate, when the vehicle is travelling at a speed in excess of 50
kilometres per hour, a speed that is not more than 10- less than the actual
speed, and

(c) be readily visible to the driver.

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> I've seen this to be the case, but I think it was only on
> modified vehicles (either wheels, diff ratios or both).

Nope.  As clearly stated in the regs, it is for very vehicle, built after 1974,
which can travel at a speed in excess of 40kph.

BV>> I don't know where this +/- 10% came from, but it is an urban
legend ..[]..

JS>  Interesting, I've read a few cases where this has been done, but of course
JS> the "I've seen it on the internet so it must be true" case
could apply here.

Probably the same authorative reporting that helps people be aware that petrol
pumps can explode when a mobile phone rings near them, or that women shouldn't
masturbate with Lobsters.

>  Over the weekend while driving to and from the snow ..[]..

We've done that once or twice too.  Having the GPS linked to a notebook with
maps of the entire state ( and most of the coutnry ) at 25k:1 res, and the
entire country at 100k:1, helps though :)

>  One thing I did learn is that you cannot trust a car's speedo.  Not only are
> they off, the error is not linear, neither a factor error, it's all over the
> place.

The 200 isn't to bad. It is a little low at 80 and about 5 clicks low at 110.

> I haven't had the opportunity to test a digital readout speedo yet.

I've got a heads-up display which I have fitted to the 200.  It reads the pulses
directly from the speed sensor, and is dead accurate, although unfortunately the
response time is a little slow.  What I mean by that, is that I can out
accelerate and brake it, but when cruising the indicated speed is very accurate.

Cheers, Brenton


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