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- Generally, speedometers are designed to never under-report speed, ensuring that we do not inadvertently break speed limits. It’s quite common for speedometers to overestimate speeds slightly, a trait that can actually work in a driver’s favor, preventing unintended speeding violations.
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Feb 11, 2022 · Speed is the measurement of distance over time. But a car speedometer doesn’t actually measure how fast you travel from Point A to Point B. Car speedos usually work by measuring rotation of the car’s driveshaft, axle or wheel. They then use some basic maths to extrapolate that rotation and determine how fast you are travelling.
Aug 16, 2022 · Legislation says that a speedo can’t over-read by any more than 10% plus 6.25mph. If you’re doing a real 30mph, legally, your speedo can’t say you’re doing more than 39.25mph. If you’re doing 50mph, it can’t show you to be doing any more than 61.25mph.
Nov 23, 2021 · If the speedometer reading is higher than the actual speed, the speedometer is fast. If the speedometer reading is lower than the actual speed, the speedometer is slow – this is what you should end up with.
Feb 15, 2018 · In general, your sat nav is more likely to be more accurate than your car’s speedometer, however that being said, it’s better to rely on your speedo as it will never understate your speed: GPS devices should be used as a navigational aid and should not be relied upon for precise measurement of speed – Garmin
Jul 2, 2018 · When a car is built its speedometer cannot under-read but can over read by an amount that equates to roughly 3%. The best way to check is with a speed app on a smartphone on a clear, straight, level stretch of motorway, that will accurately give you the car's speed across the surface of the planet. Tags: speedometer tyres.
Oct 4, 2024 · Generally, speedometers are designed to never under-report speed, ensuring that we do not inadvertently break speed limits. It’s quite common for speedometers to overestimate speeds slightly, a trait that can actually work in a driver’s favor, preventing unintended speeding violations.
Jun 8, 2020 · Traditional speedometers don’t really measure a car’s speed. They’re just an rpm gauge for the drive wheels, because that’s where they get their information—typically from a drive...
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