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Should we look at the speedometer or the navy’s speed when driving? We’ll tell you.
If you have a driver’s license, you’ve probably experienced that uncomfortable feeling of being flashed. Maybe you don’t know which speedometer to trust: the one in your car or your navigation device?
Many people have two speedometers in their cars.
The answer: it’s neither one nor the other. How accurate is a speedometer?
Let’s start with the purists with the speedometer in the car. Your car never gives you the right speed, and that’s on purpose. Your ride shows a higher rate.
Depending on the model, the actual speed displayed increased by 1 to 10%. Example: If your speedometer shows a speed of 100 km/h, you could be driving between 91 and 99 km/h. This is a safety measure.
This serves as a safety measure. On the other hand, the car’s tachograph will never show a speed lower than the actual one. This is not a whim of the manufacturer but a legal requirement (in ECE regulation R39).
So if you follow your car’s speedometer, you will always stay below the actual speed, so you take no risk.
How good is the navigation system?
The speedometer will never show you the actual speed. But the navigation system also has its weaknesses. Its Achilles’ heel: It works with satellites. So it would be best if you had good reception. Otherwise, there is a latency in the display and, thus, an incorrect speed.
How does it work? The navigation system can be more or less accurate depending on the number of available satellites, the visibility around the car, or even the algorithm used.
Speed cameras also “cheat.
So it’s not easy to determine your car’s exact speed. Speed is always a matter of judgment, even for the police.
Hence the famous expression “measured speed, corrected speed.” When radars measure speed, they always correct the speed to give themselves a margin of error. This results in 5 km/h less if you are under 100 km/h and 5% less if you are over 100 km/h.
It’s still best to take it easy: You’ll be safe on the road and won’t have to worry about speed cameras.
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