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#Post#: 100771--------------------------------------------------
Re: Islington Council "10mph limit"
By: Fluffykins Date: December 2, 2025, 4:09 pm
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Just wondering: does anyone know what the legal accuracy
requirements are for speedometers at low speeds:10mph and 20mph?
#Post#: 100772--------------------------------------------------
Re: Islington Council "10mph limit"
By: andy_foster Date: December 2, 2025, 4:22 pm
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AIUI, the requirements are that it cannot under-read at any
speed, and for true speeds between 25mph and 70mph it cannot
over-read by more than 10% +6.25mph.
Accordingly for any true speed outside of the 25mph to 70mph
range, the requirements are simply that it must not under-read.
If the result of this is that Doris drives at an indicated 8mph
in a fraudulently misrepresented advisory 10mph "limit" and her
true speed is 5mph, David Lammy will argue that that shows that
the scheme is working.
N.B. If the general rule (for between 25 and 70) were extended
to all speeds, Doris' indicated 8mph could lawfully represent a
true speed of ~1.6mph, which would be argued to be a double win
- although with no rule against the level of over-reading below
25mph, the speedo could lawfully display 80mph at that speed -
which would result in Doris dying of a heart attack, as opposed
to dying of old age before getting to the end of the road.
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