this post was submitted on 24 May 2024
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Pretty sure it's +10%/-0%... i.e. it can read up to 10% faster than reality, but can never read slower than reality. That's why most cars speedos tend to be out by around +5% to +8% from factory - making sure they are right in the middle, with a slight bias towards reading faster.
Well, that's better than I thought, thanks for the correct, I hope, but still bad if one wants traffic to move (I'm more interested in bikes moving personally, but whatever…)
No it's not. The most important thing for keeping traffic moving is making sure people drive consistently and predictably. It's when people slam the brakes (or even feather the brakes, if the person following them is too close) that you end up with traffic jams. A difference of a few km/h in the maximum speed you can be travelling without getting fined isn't a relevant factor.
Fair cop.
It used to ± 10% but the ADRs were changed somewhere in the '00s (2006, I think).