movement of the vehicle: the vehicle must proceed, driven by its own engine, in a straight line and on a level surface, at a speed of 50 ± 5 km/h.
gluaiseacht na feithicle: caithfidh an fheithicil leanúint ar aghaidh, faoi thiomáint a innill fhéin, ar líne dhíreach agus ar dhromchla réidh, ag luas 50 ± 5 km/h.