this post was submitted on 24 May 2024
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Given speedometers are only required to be +- 10%, that's some serious bullshit...
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).
Speedometers are required to be +10% plus 4km/h, -0 km/h. If your speedo says you're doing 60 and you're actually doing 61, your speedo is uncompliant. On the other hand you could be doing as little as 50 km/h. If it reads 100, you could be doing as little as 86 km/h or as much as 100.