Via word-of-mouth, I have twice heard claims that speedometers are deliberately designed to read high, so manufacturers would not be subject to litigation for speeding.
When I first heard this claim, I thought it was simply an excuse to justify speeding. However, I've noticed that this claim is even on Wikipedia (ref.), albeit unreferenced:
Vehicle manufacturers usually calibrate speedometers to read high by an amount equal to the average error, to ensure that their speedometers never indicate a lower speed than the actual speed of the vehicle, to ensure they are not liable for drivers violating speed limits.
So my question is, simply, is this true?
Question: Do manufacturers deliberately calibrate speedometers to read high?
There seems to be plenty of such claims online, but I didn't find any trustworthy evidence to support the claim.
Moreover, this claim seems inconsistent with government-enforced accuracies on speedometers (i.e., if speedometers were deliberately designed to be incorrect, then they would be less likely to meet government standards).