Why the speedometer does not show the real speed of your car?

It does not matter if you have a 98 Seat Ibiza, a minivan, a Bugatti Chiron, or the most expensive car in the world in any of these cases, the speedometer does not indicate the real speed at which your car is circulating. And, to be more exact, you always go slower than you think. Like when you talk with two too many glasses, you think you are the king of public speaking, but it is only a mirage.


And the reason is simple. This is so not because we say so, but because the law says so. Specifically, the UN ECE Regulation 39 law of the European vehicle homologation regulations, which obliges manufacturers to impose a margin of error in their speed measurement systems, which must always and obligatorily be above the actual speed. Specifically, 10% above, to which we must add 4 kilometers per hour.


We give you an example in case you are of letters, like us. If the real speed at which you drive in your car is 100 kilometers per hour, your speedometer will show 114 km / h, because to those 100 you have to add 10% (10 in this case), plus the extra 4 km. This calculation, although very approximate, does not have to be exact, because here other aspects also influence such as the type of tires the car has or their wear. In any case, with this formula, what is certain is that you always move at a slower speed than that indicated by the needle.


Obviously, this has a reason behind it that is not another that you never circulate at a speed greater than that stipulated for each type of road. In addition, manufacturers save a good number of lawsuits that they would receive if, for example, you get a fine for going 128 km / h on a highway when your car clocked 118 km / h. With this regulation, this cannot happen.


That said, this margin of error works in your favor, so do not play with it while driving faster than allowed. You are warned.

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