Vehicles with two or more rear axle ratios must be fitted with a switch device whereby those various ratios may be automatically brought into line with the ratio for which the equipment has been adapted to the vehicle.
Vozila z dvema razmerjema ali več razmerji zadnjih osi morajo biti opremljena s preklopno napravo, s katero je možno avtomatsko uskladiti ta razmerja z razmerjem, za katerega je bil tahograf prilagojen vozilu.