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posted by Fnord666 on Monday March 19 2018, @10:31PM   Printer-friendly
from the bound-to-happen dept.
 
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  • (Score: 2) by vux984 on Tuesday March 20 2018, @05:53PM

    by vux984 (5045) on Tuesday March 20 2018, @05:53PM (#655521)

    That's just it though. Speedometers read a touch low. So if you are intentionally keeping your speed at 60km/h as shown by the speedo, and then climb to 62km/h by accident you are still ok. The manufacturers deliberately calibrate the speedos to overestimate your speed.

    The standard in the UK for examples is that a speedo must *never* show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph. So at 100mph, its legal for your speedo to show anything from 100mph to 116.25mph. And from my (limited) experience most will probably show around 105-110. So if you are driving, and intentionally keeping it at 100mph as read by the speedo, you are *really* going mid-90s, and if you drift up to 102 now and again that's fine.

    Plus most speed traps themselves give a small bit of grace; to account for their own potential for error, except they are calibrated 'the other way'. So your speedo is always overestimating your speed (to ensure it never reads lower than you really are going), and police radar is underestimating it to ensure they never give you a ticket when you are within the limit, and the upshot is that if your speedo says 2km/h over the limit, you should have nothing to worry about. Unless your speedo is broken.

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