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.
Caithfear feithiclí a bhfuil dhá chóimheas acastóra cúil nó níos mó acu a fheistiú le feiste lasca ionas gur féidir na cóimheasa éagsúla sin a thabhairt go huathoibríoch i gcomhréir leis an gcóimheas dá bhfuil an trealamh oiriúnaithe don fheithicil.