twinned wheel - two wheels mounted on the same axle, the distance between the centres of their areas of contact with the ground being less than 460 mm. Twinned wheels shall be considered as one wheel, mopeedi, mootorratta ning kolm- või neliratta ühele ja samale teljele monteeritud kaks ratast, mille maaga kokkupuutuvate pindade keskmete vaheline kaugus on väiksem kui 460 mm. Topeltrattad loetakse üheks rattaks.