Correct answer
Vehicle coefficient W.
It is the vehicle’s characteristic coefficient, W. Constant K describes the input signal the tachograph needs to record one kilometre. L is the effective circumference of the driven-wheel tyres. W may be expressed in revolutions or impulses per kilometre; do not confuse it with K or assume every system transmits mechanical revolutions from the gearbox.
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Tachograph constant K.
Vehicle coefficient W.
Effective tyre circumference L.
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