Which speed reading to believe

[Dot]

Brain boxes unite for this Q/
Car speedo says 80 kph
Phone app thingo says 77kph (Margaret put it on for me)
Which one would you say is the one to believe?

[Romany Rambler]

All speedos are roughly 5% fast, so if you abide by your speedo and dont exceed the posted limit you will never get a ticket. If you follow the GPS speed you will need to be careful as if the posted speed is exceeded you are giving Mr Plod a reason to stop you.
I usually follow the GPS speeding tbe open road but follow the speedo in a built up area.

Robin

[Peter and Sandra]

Dot be careful of the GPS speed as they're usually pretty accurate when in the open and heading anywhere from west around to east but when heading south or anywhere in the southern quadrants or in heavily treed country or in valleys the gps can miss signal for 10 or 20 seconds so hold the current speed when in actual fact you could have sped up or slowed down.
This is because GPS satellites are in an equatorial orbit so when heading southwards the metal roof of the vehicle can stop or weaken signals.
We quite often run up and down the east coast on the freeway between Newcastle and Sydney and the delay is very noticeable sometimes on the phone, the Hema and the Heads up display on the windscreen.
I've just worked out what the error on the vehicle speedo is and account for that.
The problem comes when all of our three vehicles have different errors in the vehicle speedo and you momentarily forget which one you are driving )

[Greynomad]

We have a gummint speed-check gantry across the Hume Highway just south of Wodonga. Speed limit is 110km/h.

Suzuki speedo reads 118;
built-in cruise control reads 115;
phone speedo app reads 111;
gantry reads 110.

Honda speedo reads 116;
built-in cruise control doesn’t have a display;
GPS (aftermarket plug-in) reads 112;
phone speedo app still reads 111;
gantry reads 110.

Take your pick.

[T1 Terry]

You will see that just about all truckies seem to be speeding, but they are driving via GPS signal rather than the speedo reading. All large companies now log their trucks computer outputs and know if a driver is actually speeding because both the computer and the satellite log the true speed.

The nonsense that a police officer can book you for being 1 or 2 km/h over the speed limit is just that, nonsense, if it ever made it to court the magistrate would throw it out on the basis of reasonable doubt that the instrument used to measure the speed was correctly calibrated at the time ..... t
Here is a bit from SAPOL (South Australian Police) https://www.police.sa.gov.au/your-safet ... detections

[Peter]

Wish Qld commissioner would follow the same protocols. I was done for 3km/h over limit coming down the range from Maleny to Landsborough at 7pm at night. For anyone who knows the area it is a fairly steep decent. I use my gears to control speed whilst descending this road rather than riding the brakes all the way down.. Ticket in the mail 3 weeks later The Qld Govt needs the revenue I am unaware of the current situation however some years back the traffic police had a special overtime budget to operate speed cameras. Every shift the Traffic police were given 4 hours overtime to operate the speed cameras. And that overtime rate was at double time for the entire period. How do I know this information. I was a Qld police officer for 33 years and am proud that I only ever did one days radar operation in that entire period I worked in the world of real police work.

I was and still am of the opinion at we all speed from time to time not deliberately however it does happen. Not many people get out of bed in the morning and say I am going to speed today or go through a set of red traffic lights. The police need to concentrate on the small minority that drive like idiots. Unfortunately this will never happen as the Govt need the fines from the ordinary Mr and Mrs Citizen.

[Greynomad]

Vic Police allow 4% over before you cop a fine.
Probably in recognition of two facts: the majority of people unintentionally creep over the limit sometimes, and their cameras are not calibrated every day.

[T1 Terry]

Wish Qld commissioner would follow the same protocols. I was done for 3km/h over limit coming down the range from Maleny to Landsborough at 7pm at night. For anyone who knows the area it is a fairly steep decent. I use my gears to control speed whilst descending this road rather than riding the brakes all the way down.. Ticket in the mail 3 weeks later The Qld Govt needs the revenue I am unaware of the current situation however some years back the traffic police had a special overtime budget to operate speed cameras. Every shift the Traffic police were given 4 hours overtime to operate the speed cameras. And that overtime rate was at double time for the entire period. How do I know this information. I was a Qld police officer for 33 years and am proud that I only ever did one days radar operation in that entire period I worked in the world of real police work.

I was and still am of the opinion at we all speed from time to time not deliberately however it does happen. Not many people get out of bed in the morning and say I am going to speed today or go through a set of red traffic lights. The police need to concentrate on the small minority that drive like idiots. Unfortunately this will never happen as the Govt need the fines from the ordinary Mr and Mrs Citizen.

Just needs more people to challenge these fines through the courts. Long drawn out events over multiple days with expert witnesses that can testify about how such a piece of equipment would need to be set up and it is impossible to get an accurate reading under 10% with a hand held radar or tripod mounted unit, or car mounted unit for that matter, then all the court costs and witness costs fall back on the dept and really stuffs their budget.

It was virtually impossible to challenge a radar fine in NSW, till someone took a case through the court system regarding a radar fine on Elizabeth Drive Liverpool I think it was ..... the Police lost big time because the expert they brought out from the US stated to the court that the Police were told in the very beginning that the unit was not accurate being used they way the Police intended to use them .... everyone who pleaded not guilty to the offence, even if they paid the fine, had to be refunded, there were heaps of case actions against the Police and RTA regarding lost income because it resulted in loss of a job or increased insurance premiums ..... NSW Police are very careful these days to ensure they tick all the boxes and were happy to hand the speed camera stuff off to private enterprise.

There is also a case in SA where a hand held radar was proved to be incorrect after challenging it through the courts, the flow on from that is still happening.

Another case was thrown out after the QC asked in the photo image had been altered in any way ..... there was a clear hi-lighted area around the number plate and the drivers image .... when the original was produce it added the benefit of doubt as to what the actual image showed ......

T1 Terry

[Kappy]

WA speed camera's and all speed detection device have detected and alleged speed, being 2km/h less than detected.

So even laser still has a 2km/h tolerance.