at least half of the axles (or two axles out of the three in the case of a three axle vehicle and three axles in the case of a five axle vehicle) is designed to be driven simultaneously, irrespective of whether one powered axle can be disengaged;
tá leath de na hacastóirí (nó dhá acastóir as an trí cinn i gcás feithicle a bhfuil trí acastóir aici agus trí acastóir i gcás feithicle a bhfuil cúig acastóir aici) deartha lena thiomáint go comhuaineach, is cuma cé acu an féidir nó nach féidir acastóir tiomána amháin a dhíghreamú;