One (also labelled "L"): Restricts the transmission to 1st gear only, also called a "lower gear". This is useful when a considerable torque is needed with the wheels (as an example, when accelerating up a steep incline); nonetheless use at bigger speeds can operate the motor at an excessive speed, https://rafaelhlmnk.newsbloger.com/34779938/details-fiction-and-gearbox-auto