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This has nothing to do with BMW design or a BMW-specific safety feature, and if you find it beyond annoying you'll need to stop buying European cars. European law stipulates that speedometers can't show speeds less than the actual speed and they can't show more than 110% of actual speed plus 4 km/h.
Actually, you may need to stop buying cars altogether and discover the joy of mopeds. I believe even US manufacturers are allowed a % variation based on the total range of the speedometer used in the car - I think a US car with a 150mph speedo is allowed up to a 6mph variation above a certain speed, might be 55mph. I saw something in Car & Driver about this, has to do with the engineering standards followed with respect to speedometer accuracy in the USA. Bottom line - this is not a BMW-specific thing.
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