This will be interesting as the (vehicle) Australian Design Rules require a speedometer to be calibrated at 40, 80 and 120kph. There is no requirement for accuracy under 40kph.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
Mike that's interesting the last 3 Mitsubishis that I owned when checked against the sections of road set up for that purpose (also backed up by my GPS) the actual speed has been 5kph less than what the speedo was reading. Is this design requirement actually a law or is it a guideline as there seems to be some sort of tolerance built in or Mitsubishi and probably some of the other manufacturers do not comply ? When I also see in that article experts quoting the % of accident reduction in increments of 1kph I get a little worried about what beuracrauts on some of these more progressive councils will come up with next. I'm all for pedestrian safety and making the roads safer but the rules that are put in place need to be achieveable otherwise people just won't be able to comply with them.
Whilst the ADRs are not law a new vehicle must comply with them before it may be sold on the Australian market.
They specify speedo. accuracy at 40, 80, 120kph and it must be between minus zero and plus (10% + 4kph) - so a speedo may never show less than true speed but may show more by a few kph.
> When I also see in that article experts quoting the % of accident reduction in increments of 1kph I get a little worried
It's crap isn't it. The WHO says 1kph reduction equates to 3% fewer accidents. Great! So we reduce 110kph roads to 77kph and they'll be no accidents at all! An awful lot of high paid jobs are dependent on the flourishing of the Road Safety Industry.
"Lies, damned lies, and statistics"
It's a shame similar resources are not put in to suicide prevention which claims far more lives in Australia than are lost in road deaths - it just doesn't make such sexy news stories though.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
Statistics are like little puppies ... once you get them down you can do anything with them.
From the article -
Yarra mayor Daniel Nguyen said he wanted to make it safer for pedestrians and cyclists on the area's smaller roads, which are often used by motorists travelling between the outer suburbs and the city. One hundred crashes occurred within the new speed zone between 2012 and 2017. More than 90 per cent of the crashes involved pedestrians, cyclists and motorcyclists.
Just this year, two staff members were "knocked off" their bikes and students had "close calls" with motorists, who choose to drive on roads surrounding the school's entrance to avoid Hoddle Street.
Research shows that the chance of a pedestrian dying when hit by a car drops by more than half when speeds are reduced from 40km/h to 30km/h.
Apparently there have been no deaths, or fatal injuries in the past five years - just crashes with no mention of injuries.
There may, emphasis on may, be less accidents. However, if being "knocked off" ya bike at 30kph or 40kph ya gonna have a bitta skin missin'
Cheers - John
-- Edited by rockylizard on Wednesday 8th of August 2018 08:30:40 AM
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2006 Discovery 3 TDV6 SE Auto - 2008 23ft Golden Eagle Hunter Some people feel the rain - the others just get wet - Bob Dylan
Got me buggered. Most cars I've owned have read between 5 & 7k over actual speed. All the Hyundai I've owned about 1k over actual. As far as I'm concerned only Hyundai got it right. The others have serious quality issues. Even if it is intended. Garbage really.
Annoying that the manufacturer only has to be within 10% and law enforcement will only allow 3% at 100 km/hr.
Aussie Paul.
But the point is that the speedo can NEVER show a speed that's lower than actual, but MAY read high by up to 10% + 4kph.
What that means, in practice, is that you should never get pinged for speeding if you drive so that the speedo reading is at or below the posted limit!
Law enforcement might allow you to be (depending on the state) maybe 3% or 5% over the posted limit, so you might be safe to drive at 103 (indicated). I'd not bet on it, but!
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If you had to choose between being fit and drinking wine ...
Correct as of around 2006. In 2011 I purchased a brand new Proton Jumbuck ute. 6 months later I got pinned on a radar for 108 in a 100 zone. I told the policeman and he discounted my claim (of course). Only then did I download a gps program to find my speedo read UNDER the actual speed by 6kph.
I rang the Sargeant in charge of traffic and his response was to explain the adr of 2006 that no vehicle was permitted to have a speedo reading under. Then he told me that my new car did not comply hence was unroadworthy and he might "issue it with a defect notice"
Proton was required to recalibrate my cars speedo. My suspicion was that the car had been fitted with larger than standard tyres at the factory.
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Be nice... if I wanted my school teacher here I would have invited him...
The ADRs were changed in 2006 to the numbers I mentioned, prior to then I believe they required speedo. accuracy to be +/-10%.
Clearly there was an issue with your Proton, I'm sure all importers would have been well on top of the 2006 change but... you never know....
The 30kph limit is interesting though; I cannot see how a court can convict someone of exceeding a limit his speedo is not mandated to measure. No doubt someone will appeal a conviction and upper courts will decide.
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"I beseech you in the bowels of Christ think it possible you may be mistaken"
Oliver Cromwell, 3rd August 1650 - in a letter to the General Assembly of the Kirk of Scotland
No matter how low a speed limit is set, certain people will still be texting and not watching the road.
I measure that, and similar aspects of human behaviour, by a new measure I'm developing which I have called the "F-Id10T" index.
I haven't established a formal calibration procedure yet but I am overwhelmed with data from which it should be fairly easy to calculate one.
Mike,
There's been a similar thing in existence for many years in the computer business. It is known as the IDtenT error.
Diagnosis of the symptoms show that the user often suffers from the similar (but with slightly different outcomes) PEBCAK disease. (Problem Exists Between Chair And Keyboard).
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If you had to choose between being fit and drinking wine ...
