Division 2.2 Measurement of speedF1F2
United Kingdom
024 The recording equipment shall measure speed from 0 to 220 km/h.
025 To ensure a maximum tolerance on speed displayed of ± 6 km/h in use, and taking into account:
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a ± 2 km/h tolerance for input variations (tyre variations, …),
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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).
025a The speed shall be measured correctly within the normal tolerances within 2 seconds of the end of a speed change when the speed has changed at a rate up to 2 m/s 2 .
026 Speed measurement shall have a resolution better than or equal to 1 km/h.
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