One (also labelled "L"): Restricts the transmission to 1st gear only, often called a "minimal gear". This is useful when a big torque is needed in the wheels (such as, when accelerating up a steep incline); even so use at higher speeds can operate the motor at an too much https://kylerpvxxv.shotblogs.com/5-easy-facts-about-gearbox-auto-described-48070248