From: "Mark Fisher" <[EMAIL PROTECTED]>
Do you have any idea why Australian ADR's allow a +/-10% variation on Speedo's, yet we can booked if doing 3% over ??
Because the ADR's are a Federal government rule and the 3% is a Victoria Police rule. I assume your "we" doesn't include yourself because the last time I looked, SCU wasn't in Victoria, it's in the same reasonable State I live in where the allowance is around 10%. Yesss!
Seems to me like the government has left the door wide open for those wishing to dispute a speeding fine?
"I'm sorry your honour, I was only following the advice given to me buy the instruments sanctioned as "accurate enough" buy the federal government!..... i.e. the people who pay YOU"
They won't be the people who pay him even if you were booked in the ACT. Road traffic enforcement is a State/Territory matter, not Federal.
The other interesting point is that most Police radars, as supplied are spec'd to +2kmh....at any speed. This would be 2% at 100kmh, but closer to 6% error at 35kmh.
"X5" as a speed is only used on advisory signs. Enforceable limits are multiples of 10. In any case, limits below 60km/h are rarely enforced in NSW except by fixed cameras - ask me how I know!
Cheers, Graeme Cant
Cheers
Mark
Mark Fisher Sports Technologist School of Exercise Science Southern Cross University www.scu.edu.au
Ph: +61 2 66203655 Fax +61 2 66203880
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Allan Armistead Sent: Tuesday, 17 May 2005 2:53 PM To: Discussion of issues relating to Soaring in Australia. Subject: Spam: [Aus-soaring] Off topic - speedo accuracy
I'd like to ask for the indulgence of the group to go a bit off topic to gliding.
Those of you who are also members of NRMA might have seen a letter (and editorial comment) in their last edition about speedo accuracy.
As it relates to an area of interest of mine (roads/road safety) I'm intending to respond on the matter and thought it would be useful to do a straw poll of people who have the ability to "calibrate" their speedos, to get a reasonable idea of the order of accuracy across a range of makes and models. I know both my cars are optimistic by around 6-8km/h at highway speeds.
So who better to ask than people who have access to speed measuring equipment (GPS) and drive a range of vehicles on the highways and byways (glider pilots).
If anyone is interested in giving me some input into this, I would ask you to do the following - safely, on a quiet road, at legal speeds and with a passenger to read the GPS;
. drive at steady speeds of 80, 100 and (if possible/legal) 110km/h as indicated on your vehicle speedo,
. note the GPS reading at each of these indicated speeds
. tabulate the results, together with the make, model and year model of the vehicle,
. email them direct to me at [EMAIL PROTECTED] (please do not clog up the newsgroup with the results)
Apart from my specific interest in the matter, it is useful information to have for your own purposes. Australian Design Rules require a speedo accuracy of +-10%. My experience/observation is that speedos are generally a bit optimistic, but it is quite possible that if you are reading 100km/h you are actually doing somewhere between 90 and 110 - which could be important to know if you are in Victoria with it's 3km/h tolerance level.
Allan Armistead ph (02) 6249 6470, fax (02) 6249 6555, mobile 0413 013 911 PO Box 908, Dickson ACT 2602, Australia
"When once you have tasted flight, you will always walk with your eyes turned skyward, for there you have been and there you always will be." Leonardo da Vinci, 1452-1519
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