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Until July 2006 the Australian Design Rules specified that new cars sold in Australia had to have speedos that were accurate to within 10 per cent of a car's actual speed.
But under the current ADR a speedometer is not allowed to indicate a speed that is less than a car's actual speed, called under-reading. But it is allowed in effect to over-estimate the speed, by up to 4km/h plus 10 per cent, called over-reading.
There are however several other factors which come into play and could influence the result. These include under or over-inflating a car's tyres or for that matter fitting different-sized wheels or tyres, all of which will have an effect on the accuracy of your speedo.
If the vehicle you are driving is carrying a heavy load it could also cause the speedo to over-read as the tyres will be pushed out of shape and have a smaller rolling diameter as a result.
And, we're talking here only about cars sold officially here, not "grey imports" like the Nissan GT-R which is very popular with teenagers. These vehicles are not required to conform to Australian design rules.
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