A vehicle's speedometer must be kept free from any obstruction that may prevent it from being read and shall at all times it is used on a road be maintained in good working order. The implications are that it must never under-read - for obvious reasons - but may over-read. The only exceptions to this are when: The speedometer became defective during the journey being undertaken, or Speedometers and the law. A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. Speedometer Accuracy. Something like a change from 195/65/R15 tyres to 195/75/R15 tyres is what seems to have happened. Vehicle construction and use regulations require a vehicle speedometer accuracy to be in the range of -0->+10%. But if Officer Aircop starts the stopwatch a second too late or stops it a second too early and gets 5.9 seconds, he incorrectly figures Dawn's speed to be (0.125 mile/5.9 sec.) ACCURACY LIMIT. Until July 2006 this rule specified an accuracy of +/- 10 percent of the vehicle’s true speed when the vehicle was travelling above 40km/h. This means that at a true speed of 100 kilometres per hour the speedo can’t be displaying 99, … "The accuracy of the speedometer in most vehicles, including Volkswagens, is generally within a few percentage points of actual speed," Tetzlaff … If the Speedo is under reading then they have changed the tyre profile to something larger. 2.5.1. That is, at a true vehicle speed of 100km/h the speedo could indicate between 90km/h and 110km/h. A small snippet from The Car Expert about car speedometer accuracy (UK specific): The UK law is based on the EU standard, with some minor changes. So, if your true speed is 40mph, your speedometer can legally read up to 50.25mph, but never less than 40mph. Speedometer Inaccuracy, Radar tolerances and the Law . New ADR 18 says speedos cannot indicate less that the true speed, and over-indication accuracy is limited to a maximum 10 per cent plus 4km/h. If a speedometer is not accurate, it could display a lower speed than the vehicle is actually travelling at, thus causing drivers to believe they are not speeding when in fact they are. Construction and use regulations specify your speedo can over-read by 10 percent, but under-read by zero percent The threshold is there, effectively, so that drivers have no excuse if caught. The current UK law is based on the EU standard with some minor changes… A speedometer must never read less than the actual speed or show more than 110% of actual speed + 6.25mph. In the speedometer's case, here's my guess of how it probably works. An odometer accuracy of +/- 4 percent was also a requirement. ‘Speedometer’ means that part of the speedometer equipment which indicates to the driver the speed of his vehicle at any given moment (2). 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