(33)To ensure a maximum tolerance on speed displayed of ± 6 km/h in use, and taking into account:U.K.
a ± 2 km/h tolerance for input variations (tyre variations, …),
a ± 1 km/h tolerance in measurements made during installation or periodic inspections,
the recording equipment shall, for speeds between 20 and 180 km/h, and for characteristic coefficients of the vehicle between 4 000 and 25 000 imp/km, measure the speed with a tolerance of ± 1 km/h (at constant speed).
Note: The resolution of data storage brings an additional tolerance of ± 0,5 km/h to speed stored by the recording equipment.U.K.