Re: Help for speeding.
Originally Posted by
Bathsheba
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My satnav always seems to read a couple of miles per hour under what the car's speedo is recording. So I could be bang on 30 according to the satnav, then I glance at the speedo and it's registering around 32. So maybe not always best to rely on the satnav. Or is that more accurate than the car's speedo?
Car speedos are designed to read low it is in the car design rules, your sat nav is far more accurate.
I always set my cruise control to 98kph according to my sat nav (for 100kph limit) which is about 105kph according to my speedo
This is the Australian design rules but these were made to conform with European rules probably applied years before.
From July 1 2006 a new standard began its phase in and by 1 July 2007 all new vehicles had to comply. The new standard requires that:
The speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 percent plus 4 km/h.
Odometer accuracy is no longer defined.
What this means:
For a vehicle travelling at a true speed of 100km/h, the speedo must read between 100km/h and 114km/h. The effect of this is that many drivers will find that at 100km/h they are driving up to 14km/h below the speed limit if they rely on the vehicle’s speedo.
The speedo must always read 'safe', meaning the vehicle must not travel faster than the speed indicated by the speedo.