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1. • • 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.
     askthecarexpert.com/car-speedometer-accuracy/

     Are car speedometers accurate? | Ask the Car Expert

2. People also ask

   Can a car's speedometer be over read?

   • 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.

   How accurate are car speedometers? | Ask Honest John | Honest John

   www.honestjohn.co.uk/askhj/answer/104724/how-accurate-are-car-speedometers-

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   How fast can a car speedometer read?

   • We did this by comparing how fast they said we were going with our actual speed, revealed by a VBox meter. Car speedometers are not allowed to ‘under-read’ – they can’t tell you you’re going more slowly than you really are – but they are allowed to over-read by up to 10 per cent plus 6.25mph. So they could read 50.25mph at 40mph.

   UK speed camera tolerances: Met police lowers speed limit enforcement

   www.autoexpress.co.uk/car-news/106674/uk-speed-camera-tolerances-revealed-is-your-cars-speedo-accurate

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   How accurate are car speedometers?

   • How accurate are car speedometers and what is the effect on accuracy of changing running radius of tyre as tyres wear? When a car is built its speedometer cannot under-read but can over read by an amount that equates to roughly 3%.

   How accurate are car speedometers? | Ask Honest John | Honest John

   www.honestjohn.co.uk/askhj/answer/104724/how-accurate-are-car-speedometers-

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   Can a speedometer over-read a tyre?

   • In other words, you’re allowed a margin of error of no more than 10 per cent of the car’s real speed, plus 6.25mph. If you’re a car maker, then, the obvious thing to do is to calibrate your speedometer to over-read by somewhere in the middle of this margin of error, so that there’s space either way to account for tyre condition or size changes.

   Ask the expert: 'Why are speedometers still so wildly ... - The Telegraph

   www.telegraph.co.uk/cars/advice/ask-expert-speedometers-still-wildly-inaccurate-2021/

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   Does a new car's speedometer show true speed?

   • In practice, a new car’s speedometer might not display the exact true speed but will be very close, typically within a few percent of the actual speed. This margin ensures that if there is an error, it’s on the side of caution, displaying a slightly higher speed than reality.

   How Accurate are Car Speedometers: Unveiling the Truth Behind Your

   ranwhenparked.net/how-accurate-are-car-speedometers/

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   Why are speedometer readings important?

   • Accurate speedometer readings are crucial, not only to comply with legal standards but also to ensure the safety of all road users. Laws mandate that your car’s speedometer does not under-read your actual speed. This is to ensure you do not inadvertently break speed limits by relying on inaccurate data.

   How Accurate are Car Speedometers: Unveiling the Truth Behind Your

   ranwhenparked.net/how-accurate-are-car-speedometers/

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3. www.thecarexpert.co.uk › how-accurate-is-a-carHow accurate is your car speedometer? | The Car Expert

   www.thecarexpert.co.uk › how-accurate-is-a-car

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   Feb 11, 2022 · Have you noticed that your car speedometer sometimes reads faster than your satnav says? It's very common. Find out why this happens.

4. askthecarexpert.com › car-speedometer-accuracyAre car speedometers accurate? | Ask the Car Expert

   askthecarexpert.com › car-speedometer-accuracy

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   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.

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6. www.autoexpress.co.uk › car-news › 106674UK speed camera tolerances: Met police lowers speed limit ...

   www.autoexpress.co.uk › car-news › 106674

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   Sep 28, 2022 · Car speedometers are not allowed to ‘under-read’ – they can’t tell you you’re going more slowly than you really are – but they are allowed to over-read by up to 10 per cent plus 6.25mph. So...

7. www.honestjohn.co.uk › askhj › answerHow accurate are car speedometers? - Ask Honest John

   www.honestjohn.co.uk › askhj › answer

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   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.

8. www.startrescue.co.uk › breakdown-cover › motoringHow accurate is my car speedometer? | startrescue.co.uk

   www.startrescue.co.uk › breakdown-cover › motoring

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   Jul 1, 2024 · The likely error margin of the speedometer’s accuracy is factored in to how car makers calibrate their speedometers. Car manufacturers will normally deliberately calibrate their speedos to read ‘high’ by a certain amount.

9. ranwhenparked.net › how-accurate-are-car-speedometersHow Accurate are Car Speedometers: Unveiling the Truth Behind ...

   ranwhenparked.net › how-accurate-are-car-speedometers

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   Oct 4, 2024 · Laws mandate that your car’s speedometer does not under-read your actual speed. This is to ensure you do not inadvertently break speed limits by relying on inaccurate data. The Society of Automotive Engineers (SAE) defines standard practices for speedometer accuracy, and vehicles must comply with these guidelines.

10. www.telegraph.co.uk › cars › adviceAsk the expert: 'Why are speedometers still so wildly ...

    www.telegraph.co.uk › cars › advice

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    Aug 14, 2021 · If you’re a car maker, then, the obvious thing to do is to calibrate your speedometer to over-read by somewhere in the middle of this margin of error, so that there’s space either way to ...