One (also labelled "L"): Restricts the transmission to 1st gear only, also called a "minimal gear". This is beneficial when a considerable torque is necessary within the wheels (such as, when accelerating up a steep incline); even so use at higher speeds can run the motor at an excessive speed, https://trentonmuxyx.blogdiloz.com/33139622/the-2-minute-rule-for-gearbox-auto