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I personally use OBDII as that bypasses the tolerance set by manufacturers. This is usually set to +0% to -10%. The problem with using GPS or OBDII at least here in SA is that you can be fined for doing 1 km over the limit which happened to my wife only recently. Police know the law is based on tolerance and that there is no excuse.
So drivers beware if you use GPS as the speed is done using averaging otherwise variation in GPS accuracy can give multiple fast fluctuations.
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