Many satnavs are unable to account for changes in vertical direction, so they may be less accurate if you are travelling up or down a steep hill. Stuart is the Editorial Director of our suite of sites: GAP insurance and warranty offers from ALA. Its also about the inability to see whats happening ahead and to be seen. I’m not advocating doing this, but it’s interesting to know where you stand, until the rules, or the accuracy of cars’ speedos change. In the next three days I got 3 speed fines, I was driving under the speed limit. I just noticed my 2016 Volvo XC90 reads 100kmh when my dashcam says 96. It’s a very similar concept to a bicycle speedometer. Surely car manufacturers can make their speedos accurate to the precise mph or km/h you are travelling at? They repeatedly locate your exact position on earth via satellite and calculate how far you have travelled, then divide by the time it took for you to travel that distance. Of being so close a proximity that one has visual fixation on the rear of that vehicle and being transfixed on their rear brake lights. Full Forum Listing. If the diameter decreases (eg – worn tyres, less air in the tyres, a different brand of tyre with slightly different dimensions), then the car will be travelling a shorter distance for each revolution of the wheel, therefore you will be going slower. I am in UAE, Sharjah, driving Ford Figo 2012, original tyre size written in the car is 175/65 R14 82, on 15 oct 2016 tyre shop put 185/70 R14 88 tyre when I changed them. my car could be travelling at a Speedometer speed of around 85.6 mph over which the potential fine might be applied. Is it possible the speedo on my car could be out that much? So I did a few calculations and it surprised me how little it did affect the readings. In order to correct this, you can install an In-Line Speedometer Calibrator. I understand perfectly what Les was saying above re: travelling through roadworks. If the odometer is off, the speedometer should likewise be off. It's not part of the MOT test, as far as I know. They are also inherently more accurate at higher speeds, as a larger distance over time reduces rounding errors, but a satnav will usually be much closer to a carâs true speed than the speedometer. Replacing its tires with, say, a ⦠But if you are moving at 30mph, you are covering more than 13 metres per second, which makes it possible for a satnav to measure your speed accurately. So I was wondering, how does this affect the speedo and odometer readings? As far as I’m aware, there’s no longer any difference in the accuracy of civilian vs military GPS. 215/60R16 Diameter 26.2″ Width 8.5″ Sidewall 5.1″ Circumference 82.1″ Revs/Mile 795. An exclusive Drive test has shown 93 per cent of new car speedometers are inaccurate. Wheel circumfererence (known, but with fudge factor as described above) x wheel rotation speed (known, measured from axle or wheel sensors) = vehicle speed. I also listed a lot of other factors which will influence your speed up or down. As more cars get six-speed manual gearboxes and seven- or eight-speed automoatic gearboxes, they tend to prefer being in a higher gear than you may be used to. 2005 Toyota RAV4 L 4 Cyl 2.4L Automatic Transaxle, For Speedometer; 2005 Toyota RAV4 Sport 4 Cyl 2.4L Automatic Transaxle, For Speedometer; 2007 - 2009 Toyota Yaris S 4 Cyl 1.5L; 2007 - 2011 Toyota Yaris RS 4 Cyl 1.5L; 2007 - 2012 Toyota Yaris Base 4 Cyl 1.5L; 2007 - 2013 Toyota Yaris CE 4 Cyl 1.5L; 2007 - 2013 Toyota Yaris LE 4 Cyl 1.5L Anyone can just go in and purchase these wheel and tyre combinations (and similar ones to their respective model) and just fit them to their vehicle without any recalibration by Ford. Thanks! T&Cs | Privacy | Cookies© 2021 Immediate Network Ltd. All rights reserved. Hi Neil. I also wonder if that affects the accuracy of the odometer. Only a 3% discrepancy. In fact, most manufacturers build speedometers so they fall within a fairly narrow tolerance range, no more than 1 percent to 5 percent too slow or too fast. I think they did not do actual speed test which is depends on tyre size. The problem is that in a town environment one can now apparently have two lawful speeds. Thx. I wonder if the difference is because I have 15 inch tyres instead of 17. Read More The biggest fluctuations in speed readings usually come from tyre wear, pressure and tread depth, as well as calibration of the speedo. This gives the perception that drivers are travelling faster than what they really are - or exactly at the limit. There is a difference of 43 Revs/Mile between the 17″ and 19″ wheel and tyre combination. When you upgrade your Toyota with performance tires or non-stock gearing, choose a premium speedometer calibrator to ensure your speedometer's accuracy. A lot of things are possible. Do we do 30 or 35 mph? I know which one I would choose. Some factory satnav systems will also use data from the car to integrate with the GPS signal to improve overall accuracy. Worn out tires affect the accuracy of your speedometer. Whatever the truth is about relative speeds per rotation of tyre or whatever the problem caused is that some drivers still adopt rightly or so the ida that they will stay safe and do the max speed limit as shown on their speedometers. And, as we are all told “Twenty-one’s plenty!”, The reason for the question was that this week in our local paper the Speedwatch Co-ordinator wrote that “No-one makes the public pay speeding fines and a generous allowance of at least 17% is given before tickets are issued. Several years ago The Chief of Police Officers, then known as ACPO. That is, with the speedo displaying 100km/h the vehicle must be travelling between 87.3km/h and 100km/h. So some vehicles will have been travelling only 3% slower than the speed shown. I know this as I was behind a relative and another car was in front of him, as I go through cameras I always check my speed, also the two other drivers in front have had nothing sent to them. We have a 2013 Toyota RAV4 AWD Signature Class that we purchased in December 2016 from the local Toyota Dealer. Is this a good question? Now I have driven 20,000 miles with an average loss of 1% miles on the odometer and the speedometer averages 6% over the indicated speed. I thought that the satellite signals were deliberately designed to be less accurate than possible for “security reasons”? Is it a coincidence that speed vans position themselves in downhill stretches of roads. I recently bought a 2012 Ford Focus from a local Ford dealer. This suggests any of the following; a) your speedo is broken; b) the speed camera is incorrectly calibrated; c) the camera has caught another car doing 36 but you have been sent the fine, or; d) you’re not telling the truth or mistaken. This is adopted throughout the police services nationwide. approx 10% too fast; or are the speed limits, and the well-known formula of “10% + 2mph,” based on the correctly calibrated speed of the cameras, roadside digital lights showing your speed and the accurate speedos in trucks as discussed above? Air pressure in the tyre makes no difference to the measured speed of the vehicle. I checked in internet that tyre size affects to the actual speed and also I compare to the speed application and realized that car speedo showing 4_5 km/hr less than application. The US federal regulation on speedometer accuracy reads: Each bus, truck, and truck-tractor must be equipped with a speedometer indicating vehicle speed in miles per hour and/or kilometers per hour. Tailgating is not just about being too close to the vehicle in front so that one can not guarantee stopping in the distance that can be seen to be clear ahead and that is dangerous enough there are other consequences. As car expert could you give me some solution for the current problem, instructions how to identify the exact problem, to whom contact? Thanks for that, Stuart. Toyota Safety Sense ⢠2.0 (TSS 2.0) 86 âPre-Collision System with Pedestrian Detection (PCS w/PD) 56, Lane Departure Alert with Steering Assist (LDA w/SA), 49 Automatic High Beams (AHB), 8 Road Sign Assist (RSA), 64 Lane Tracing Assist (LTA), 50 Full-Speed Range Dynamic Radar Cruise Control (DRCC) 40; Star Safety System ⢠âincludes Vehicle Dynamics Integrated Management (VDIM), ⦠To ensure that they comply with the law and make sure that their speedometers are never showing less than true speed under any foreseeable circumstances, car manufacturers will normally deliberately calibrate their speedos to read ‘high’ by a certain amount. To illustrate, if you are driving your car at 30mph in 2nd gear, 3rd gear or 4th gear, your ratios are very different but the speedo is still accurate. Hi Rahul. Can this result in a speeding ticket? The worst culprits for inaccuracy were the Nissan Juke, Toyota Kluger, Alfa Romeo MiTo and Jeep Wrangler (all 6km/h off). I have a part-time delivery job and the van's speedo regularly and consistently over-reads by 20 per cent as calibrated against my satnav, Is this legal? While this wouldn’t usually be a problem, it means I would need to take the car to higher than the speedo reading to suit the gear (and risk breaking the speed limit unknowingly), or else put up with the vibration of a labouring gear, or drop down to a less economic gear for higher engine revs. Does a speedo need to display MPH to be legal in the UK ? Surely it couldn’t be that difficult to bounce a tiny radar or sonar off the ground to measure real speed? Different police forces may adopt different tolerances for how they enforce it, but there is no such thing as two speed limits. 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