A dual-clutch transmission includes an odd gears clutch, an odd gears shaft supporting at least two odd-numbered rotary gears, an even gears clutch, and an even gears shaft supporting at least two even-numbered rotary gears. A driven rotary shaft is selectively connectable to one respective said odd- or even-numbered gear at a time. The dual-clutch transmission includes first and second range selection gears to transfer drive from the driven rotary shaft to an output shaft so as selectively to permit selection of at least a first range transmission ratio or a second range transmission ratio. The dual-clutch transmission further includes a first bypass drive line to drive engagement of at least two mutually engaged bypass rotary gears with the output shaft, giving rise to a first intermediate transmission ratio.