One (also labelled "L"): Restricts the transmission to 1st gear only, also known as a "minimal gear". This is beneficial when a significant torque is required for the wheels (for instance, when accelerating up a steep incline); however use at better speeds can operate the motor at an excessive velocity, https://charlieseikk.bloggazzo.com/33213089/the-basic-principles-of-gearbox-auto