European speedos with 6% "Error"

[NDORFN]

I have. Seem to remember a post on here a couple of weeks ago - dude got done for 104 FFS!

That's insane. I'd have to see it to believe it.

[steve_t]

they park 300 mtrs away from the school over the road from the park , and i got the ticket at 10 45.

At school start and finish times i am very cautous. Kids as we know are very impulsive and do silly things, well i know my son does and would hate anything to happen to him as any parent would

10 45am ticket is just revenue grabing, and its a high school too, not little kids

I thought the ticketing anyone above 55km/h in front of a school was only between 7:30am-9:30am Mon-Fri. Or is that only here in Hamiltron? Oh and after school too

[RDjase]

I thought the ticketing anyone above 55km/h in front of a school was only between 7:30am-9:30am Mon-Fri. Or is that only here in Hamiltron? Oh and after school too

I thought it was something like that but couldnt be bothered with letters and all the crap over a $30 ticket.

[boomer]

In Europe, at least for cars, they have a rule that a car speedo can never read more than the actual speed it is travelling at.

This rule you quote... can you point me to it...??!!


man i can't believe the sh ite you come out with

[Hitcher]

On the occasions when it works, the Shiver's speedo reports a 6% error. I know this because I have a GPS fitted to the bike for the occasions when the speedo doesn't work. The odometer, on the other hand, is accurate to 0.1%. Given that the speedo and odo share the same components, one can safely assume that the error is deliberate.

On other occasions, the speedo is all over the place like a mad woman's breakfast (I've had 100km of Lotto numbers once, and an indicated top speed of 200kmh) or not working at all. In those cases the error varies a little from the more usual 6%.

Oh, and did I mention that I've been waiting since March for parts?

[p.dath]

This rule you quote... can you point me to it...??!!

man i can't believe the sh ite you come out with

http://www.answers.com/topic/speedometer

"In many countries the legislated error in speedometer readings is ultimately governed by the United Nations Economic Commission for Europe (UNECE) Regulation 39[4] which covers those aspects of vehicle type approval which relate to speedometers."

I'm guessing you hadn't heard of this legislation before?

[p.dath]

http://www.answers.com/topic/speedometer

"In many countries the legislated error in speedometer readings is ultimately governed by the United Nations Economic Commission for Europe (UNECE) Regulation 39[4] which covers those aspects of vehicle type approval which relate to speedometers."

I'm guessing you hadn't heard of this legislation before?

And if you want to get super technical, refer to:
http://www.unece.org/trans/main/wp29...gs/r039r1e.pdf
Section 5.3.
Which specifies this formula for the standard error:
0 ≤ (V1 - V2) ≤ 0.1 V2 + 4 km/h
But I'll let you read it. It's a tad complicated for me. But basically, at 100km/h it equates to a 6% error.

[Hitcher]

http://www.answers.com/topic/speedometer

"In many countries the legislated error in speedometer readings is ultimately governed by the United Nations Economic Commission for Europe (UNECE) Regulation 39[4] which covers those aspects of vehicle type approval which relate to speedometers."

That reference doesn't validate your previous statement. It just allows for a maximum error margin for speeds over 40kmh.

[davereid]

I have got a Holden ute, its got an analog and a digital speedo, and a trip computer.

They are all different.

At 103 on the analog speedo, the digital one says 100. But if I lock the cruise control on, after a minute or so the computer will tell me average speed is 96.

Computer is very close to GPS.

[boomer]

That reference doesn't validate your previous statement. It just allows for a maximum error margin for speeds over 40kmh.

Exactly; teh standards are quite clear in what they're set out to achieve and its not what you're saying/claiming..... And many countries does not a Europe make...

[road king]

our trucks at work are all isuzu's. one of them reads 100km/h when your doing 90km/h. and another one reads about 80km/h at 90.



and the cops have a tolerance of 5km/h

[boomer]

In Europe, at least for cars, they have a rule that a car speedo can never read more than the actual speed it is travelling at.
So how do the car manufacturers handle this? They introduce a deliberate 6% error, and report the car is travelling faster than it is. For example, if it says you are travelling at 100km/h, you are actually doing 94km/h. It stands out a lot when you use a GPS.

Most European cars are affected by this, like BMWs.

In NZ we don't have any such rule, and typically we have used "average speed" speedos. So if your car (assuming it wasn't made in for for Europe) says you are doing 100km/h, you are (within a small +/- range).

What I'm trying to find out is what regulations NZ has with regard to speedo accuracy. I've had a good search, and just kind find it.
I'm sure we must have something that governs this.

Does does anyone know the regulation/rule/legislation that covers this, or better still, can give me a URL so I can read it myself?

your math is all wrong...

• The indicated speed must never be less than the actual speed, i.e. it should not be possible to inadvertently speed because of an incorrect speedometer reading.
• The indicated speed must not be more than 110 percent of the true speed plus 4 km/h at specified test speeds. For example, at 80 km/h, the indicated speed must be no more than 92 km/h.

110% +4kmh on 100 is 114 so in ur example if ur travelling literally at 94kmh then ur speedo may show upto 107.4 kmh



and Nz probably dont have any such guidelines because they dont build cars....

[p.dath]

...
110% +4kmh on 100 is 114 so in ur example if ur travelling literally at 94kmh then ur speedo may show upto 107.4 kmh

Not quite. I think this is the way it works.

v1=100km/h (displayed speed - how fast you think you are going)
v2=88km/h (actual speed you are going, ignoring fraction)

The rulle requires v1-v2 (which equals 12km/h) to be less than 0.1v2+4 (which equals 12.8km/h). v1-v2 must also be above zero.

So if you were a manuafcturer and wanted to sit in the middle of that range, then the speed offset would be 12/2 - or 6km/h.

Which supports what I said, that when the speedo displays 100km/h the actual speed (as report by GPS) is 94km/h - or a 6km/h error. Bang smack in the middle.

Make sense?

[Sam I Am]

so how without a gps can i messure out if my speedo is out ?

[Hitcher]

Not quite. I think this is the way it works.

v1=100km/h (displayed speed - how fast you think you are going)
v2=88km/h (actual speed you are going, ignoring fraction)

The rulle requires v1-v2 (which equals 12km/h) to be less than 0.1v2+4 (which equals 12.8km/h). v1-v2 must also be above zero.

So if you were a manuafcturer and wanted to sit in the middle of that range, then the speed offset would be 12/2 - or 6km/h.

Which supports what I said, that when the speedo displays 100km/h the actual speed (as report by GPS) is 94km/h - or a 6km/h error. Bang smack in the middle.

Make sense?

Apart from the spelling, no. 94 plus 6% isn't 100. And it's "bang smack in the middle" of what?