One (also labelled "L"): Restricts the transmission to 1st gear only, generally known as a "low equipment". This is helpful when a big torque is needed for the wheels (for example, when accelerating up a steep incline); nevertheless use at higher speeds can operate the motor at an abnormal pace, https://zanderqempx.theideasblog.com/34640192/gearbox-auto-fundamentals-explained