Car and driver speedometer accuracy

 · Ever. On the high side, it’s allowed to read up to 10% above the actual speed plus four or six kilometers per hour, depending on the type of vehicle. Compare this Estimated Reading Time: 3 mins.  · Manufacturers are guided by a standard set by the Society of Automotive Engineers known as J Electric Speedometer Specification. At speeds above about 90 km/h the allowable range for speed is 4% of the highest reading shown on the speedometer. For the vehicles in my family, this means +/- 8 km/h for my pickup and +/- 10 km/h for my wife's car.  · GPS satnav systems calculate your speed by using satellites - and assuming the signal is strong, they should be accurate. Some sat navs installed at manufacture are integrated with the car's own measurements to provide a more accurate speed reading. Under UK law - which is based on a European Union standard - speedometers must never underreport a vehicle's speed, while it must /5(K).

Ever. On the high side, it’s allowed to read up to 10% above the actual speed plus four or six kilometers per hour, depending on the type of vehicle. Compare this chart to the first one. The most a. The law for car speedometers in the UK The UK law is based on the EU standard, with some minor changes. A speedo must never show less than the actual speed, and must never show more than % of actual speed + mph. So if your true speed is 40mph, your speedo could legally be reading up to mph but never less than 40mph. The speedometer, or "speedo" for short, is one of the most important features of any car and serves the purpose of giving the driver a good idea of the speed they are travelling in either kilometres per hour or miles per hour or even a combination of the two. But just how accurate are they? Well, as a matter of fact, they are not that accurate. Speedometers usually portray a slightly slower speed than what you are actually doing with an offset of around 2 - 4 miles per hour.

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