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  Reply # 1491894 14-Feb-2016 07:59
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UncleArthur:
FYI, GPS is only accurate if you are travelling on the flat, as the gps satellite network can only determine your location in 2 dimensions.

Eg. If you were travelling up a 45 degree slope at 100km/h GPS would report only your horizontal speed, which in this case would be 50km/h.

Something to consider before thinking of gps speed as an authoritative source.

 

Many GPS units have altimeters actually, which allows them to determine altitude (I suspect including one is a cheap addition that allows them to be more accurate) and all phones do.

 

 


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  Reply # 1491993 14-Feb-2016 12:21
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Kyanar:

 

Many GPS units have altimeters actually, which allows them to determine altitude (I suspect including one is a cheap addition that allows them to be more accurate) and all phones do.

 

 

 

 

They don't need altimeters. Lock on 4 or more GPS satellites gives you position in 3 dimensions.





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  Reply # 1492079 14-Feb-2016 14:15
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They certainly do know your position in three dimensions so should be able to account for elevation. Without looking at the particular calculation of the device however you wouldn't know.

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  Reply # 1492087 14-Feb-2016 14:32
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There's a newer model, white, Toyota Estima with an odd towbar fitting that I've seen around Glenfield (Auckland) a lot. Seen quite a few 55km/h tickets from it between friends & family.


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  Reply # 1492095 14-Feb-2016 15:23
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AidanS:

 

There's a newer model, white, Toyota Estima with an odd towbar fitting that I've seen around Glenfield (Auckland) a lot. Seen quite a few 55km/h tickets from it between friends & family.

 

 

 

 

Yep, Had to explain to my mother to look out for them particularly around the top end of Wairau Road after she got a few tickets.

 

 

 

I've gotten one on that road but I usually set the cruise control to 50 and stop paying attention, Although I typically have to pull over to the side lane going up as it leads to a very large amount of angry people sitting behind me and anyone else in the car asking why I'm going so slow, No way that road should be anything lower than a 70.

 

 

 

Side note: Starting to get tempted to get tinting and racing stripes on the commodore so people stop thinking I'm a cop and slowing down as the stupidly loud exhaust doesn't seem to be stopping them.





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  Reply # 1492098 14-Feb-2016 15:25
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UncleArthur:
tehgerbil:

 

In most cars I've known, they display a bit over your real speed - my old 96 mirage was a good 5km over real speed (determined by gps and those reactive speed readout signposts) this is also reflected by Drive.com.au analysis of basically every vehicle they tested. 

 

 

 

In short if you get pinged at 55, there's a high likelihood you were a bit north (in my case that'd be 60!) than that on your speedo and you should have been paying better attention. 

 



FYI, GPS is only accurate if you are travelling on the flat, as the gps satellite network can only determine your location in 2 dimensions.

Eg. If you were travelling up a 45 degree slope at 100km/h GPS would report only your horizontal speed, which in this case would be 50km/h.

Something to consider before thinking of gps speed as an authoritative source.

 

Did they not teach trigonometry at your school?

 

Going up or down a 45 degree slope at a road speed of 100kph would give you a horizontal speed of 70kph.

 

You would need to be going up or down a 60 degree slope to get a halving of horizontal speed.

 

It is irrelevant anyway. We do not have streets with 45 degree slopes. The world's steepest street - yay for Dunedin - is only 19 degrees at its very steepest ('cording to wikiP) and that is enough to give an error in GPS speed of a whole huge 5% which means that in the real world your GPS is as accurate as you need.

 

Also, the GPS network can calculate your height. In terms of absolute height it is less accurate than in terms of horizontal position but in relative heights, it is good enough that some aircraft constructors have built systems to detect and display angle of bank and angle of pitch by measuring the relative GPS heights across wing-tips and from nose to tail. I am sure that the GPS speed shown on your phone does not take this into account - it does not need to - even on Baldwin Street but it certainly can measure your height.


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  Reply # 1492110 14-Feb-2016 15:54
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Are radar detectors still legal in NZ these days?





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  Reply # 1492111 14-Feb-2016 15:56
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And are those old speed cameras still working? I've always wanted to know how they operate technically, like how do they set the speed tolerance for all the cameras in NZ? Do they use mobile data to remotely send all the infringing images and information to the central police headquarters?





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  Reply # 1492127 14-Feb-2016 16:50
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sonyxperiageek:

 

Are radar detectors still legal in NZ these days?

 

 

Still? They have been widely and openly for sale in the 11 years I have been here.






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  Reply # 1492143 14-Feb-2016 17:54
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sonyxperiageek:

 

Are radar detectors still legal in NZ these days?

 

 

Yes, but largely useless based on the one that came fitted to my car at giving warning. Have usually seen the estima and started to slow down before it goes off.





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  Reply # 1492226 14-Feb-2016 19:57
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Jaxson:

 

I got a ticket recently, first time in ages.  Thought I was under the 4km/hr tolerance at 72 but turned out I was still in a 50km/hr zone :(

That 50km/hr zone stays in place for miles as you head north out of Otorohanga in the Waikato.  Roads wide as and all the houses are off driveways back up off the road.  Caught me by surprise.

 

 

 

You want to try Lake Terrace coming into Taupo from the south.  Most of the year the 70km/50km change over occurs near Makatu St but over Christmas/New Year it moves further out of town out past Richmond Ave. It's a real trap when you're used to it being closer to town.





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  Reply # 1492313 14-Feb-2016 22:54
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SaltyNZ:

 

Kyanar:

 

Many GPS units have altimeters actually, which allows them to determine altitude (I suspect including one is a cheap addition that allows them to be more accurate) and all phones do.

 

 

 

 

They don't need altimeters. Lock on 4 or more GPS satellites gives you position in 3 dimensions.

 

 

 

 

Learn something new every day :-)


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  Reply # 1492325 14-Feb-2016 23:14
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jpoc:

 

UncleArthur:
tehgerbil:

 

In most cars I've known, they display a bit over your real speed - my old 96 mirage was a good 5km over real speed (determined by gps and those reactive speed readout signposts) this is also reflected by Drive.com.au analysis of basically every vehicle they tested. 

 

 

 

In short if you get pinged at 55, there's a high likelihood you were a bit north (in my case that'd be 60!) than that on your speedo and you should have been paying better attention. 

 



FYI, GPS is only accurate if you are travelling on the flat, as the gps satellite network can only determine your location in 2 dimensions.

Eg. If you were travelling up a 45 degree slope at 100km/h GPS would report only your horizontal speed, which in this case would be 50km/h.

Something to consider before thinking of gps speed as an authoritative source.

 

Did they not teach trigonometry at your school?

 

Going up or down a 45 degree slope at a road speed of 100kph would give you a horizontal speed of 70kph.

 

You would need to be going up or down a 60 degree slope to get a halving of horizontal speed.

 

It is irrelevant anyway. We do not have streets with 45 degree slopes. The world's steepest street - yay for Dunedin - is only 19 degrees at its very steepest ('cording to wikiP) and that is enough to give an error in GPS speed of a whole huge 5% which means that in the real world your GPS is as accurate as you need.

 

Also, the GPS network can calculate your height. In terms of absolute height it is less accurate than in terms of horizontal position but in relative heights, it is good enough that some aircraft constructors have built systems to detect and display angle of bank and angle of pitch by measuring the relative GPS heights across wing-tips and from nose to tail. I am sure that the GPS speed shown on your phone does not take this into account - it does not need to - even on Baldwin Street but it certainly can measure your height.

 

 

Yeah they did, but I haven't been to school for 25 years, and I was not suggesting we have 45 degree roads, just picking numbers to demonstrate concept.

 

 

 

 


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  Reply # 1492353 15-Feb-2016 05:38
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johnr: @Dunnersfella All of the tickets have been issued on the North Shore, Auckland

and Yes I agree with you, Don't speed then no ticket but this seems OTT

 

 

 

yes, North Shore, 55 in a 50, its really very annoying, to stop that one would need to be constantly staring at the speedo which is just silly if the point is safety.


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  Reply # 1492362 15-Feb-2016 07:06
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thecatsgoolies: Mine was issued on 20th Jan. Mid week not in the holiday period. Infringement states alleged speed of 55 in 50 area. Got the ticket yesterday. Yes I was obviously speeding but a $30 ticket probably cost more to process and yes, on the shore and no where near a school.

 

 

 

Well you can't really call it revenue gathering then can you!


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