mudguard: Speed is always a factor, rarely is it a stationery car, but how often is it excessive speed? Tell how fast someone left a corner, were they doing 104k, were they doing 130k? I've no idea how they would work out the speed in a crash now either. I presume they must estimate from the damage on the car.

Bung:

mudguard: Speed is always a factor, rarely is it a stationery car, but how often is it excessive speed? Tell how fast someone left a corner, were they doing 104k, were they doing 130k? I've no idea how they would work out the speed in a crash now either. I presume they must estimate from the damage on the car.

On some modern cars if the air bags operate there is some retained data including the speed during the last few seconds. http://www.stuff.co.nz/national/crime/4006781/Airbag-data-convicts-driver

RunningMan:

mudguard:

On a side note, do trucks have a lower maximum speed limit or are they the same as cars?

The lower of 90km/h or the applicable speed limit for the area.

http://www.nzta.govt.nz/resources/roadcode/heavy-vehicle-road-code/about-limits/speed-limits.html

andrewNZ: My understanding is that a speedo is allowed to read 10% high (says 100 but you're travelling slower) but it absolutely must not read low.

In my experience, most modern cars read 5-10km/h high so there's a good chance you thought you were doing 110 anyway.

Bung:

mudguard: Speed is always a factor, rarely is it a stationery car, but how often is it excessive speed? Tell how fast someone left a corner, were they doing 104k, were they doing 130k? I've no idea how they would work out the speed in a crash now either. I presume they must estimate from the damage on the car.

On some modern cars if the air bags operate there is some retained data including the speed during the last few seconds. http://www.stuff.co.nz/national/crime/4006781/Airbag-data-convicts-driver

andrewNZ: Perhaps officers could have the option of (alternatively or additionally) making you sit quietly no phone, radio, or other distraction except perhaps a information leaflet for 15-30 minutes and think about it. Might stop people speeding if they're in a hurry. A 30 minute delay is a pretty big deterrent in many cases.

mudguard:

andrewNZ: Perhaps officers could have the option of (alternatively or additionally) making you sit quietly no phone, radio, or other distraction except perhaps a information leaflet for 15-30 minutes and think about it. Might stop people speeding if they're in a hurry. A 30 minute delay is a pretty big deterrent in many cases.

I think this would be a brilliant idea actually.
5-10k over 30 minute wait
20-30k, 1 hour
30k and over 2 hours...

Police could simply take your keys, and have then drop them back, or have another car do it on their way past. If the car moves (ie spare set in the glovebox) instant impounding or loss of licence.

frankv:

mudguard:

andrewNZ: Perhaps officers could have the option of (alternatively or additionally) making you sit quietly no phone, radio, or other distraction except perhaps a information leaflet for 15-30 minutes and think about it. Might stop people speeding if they're in a hurry. A 30 minute delay is a pretty big deterrent in many cases.

I think this would be a brilliant idea actually.
5-10k over 30 minute wait
20-30k, 1 hour
30k and over 2 hours...

Police could simply take your keys, and have then drop them back, or have another car do it on their way past. If the car moves (ie spare set in the glovebox) instant impounding or loss of licence.

Not so brilliant, IMHO... it's the thin end of a very long wedge for a person to be detained without any kind of judicial overview. Police can now do that for up to 15 minutes to "verify your identity". Allowing them to effectively imprison you (and your innocent passengers) in your vehicle is way over the top.

Given the dubious social benefits of driving at 100kph vs 105kph, it's completely unwarranted.

gished: So the consensus seems to be no, because most speedos over compensate. That's fine, good to see it generated some discussion.

Was I aware I was going over the limit? Yeah possibly, if it was where I think it was - I drove just under 1k km's that week so it's hard to say definitively but there were times where I would look down and realised I'd crept over the limit and slow down. It also didn't help that I started using the satnavs gps as the odometer.