Actually Andrev has a point here
I understand that in the past it was not possible to have high accuracy on the speedometer, and due to law/regulations car manufacture have been forced to add en error and show always speed above the real one.
But now, every car has GPS on board, and GPS is quite accurate on reading the real speed ... and the car could be tuned in real time to always show the real car speed (even inside a tunnel without GPS signal)
I think ... car manufacture got used to show speed in excess .. and possibly also driver got used to drive a bit faster since they know that the speedometer show an overestimated speed ...
But maybe it would be wise to change the law and regulations .. and force car manufactures to provide accurate with an error below 1% (as well ... countries should not punish people for have speed up to 1% above the speed limit ... I know most wise country and policeman do already ... but not everywhere and not every police man)
I understand that in the past it was not possible to have high accuracy on the speedometer, and due to law/regulations car manufacture have been forced to add en error and show always speed above the real one.
But now, every car has GPS on board, and GPS is quite accurate on reading the real speed ... and the car could be tuned in real time to always show the real car speed (even inside a tunnel without GPS signal)
I think ... car manufacture got used to show speed in excess .. and possibly also driver got used to drive a bit faster since they know that the speedometer show an overestimated speed ...
But maybe it would be wise to change the law and regulations .. and force car manufactures to provide accurate with an error below 1% (as well ... countries should not punish people for have speed up to 1% above the speed limit ... I know most wise country and policeman do already ... but not everywhere and not every police man)