The document outlines color coding conventions for tractor controls. Red controls are used to stop the engine, orange controls govern ground motion like transmission and braking, yellow controls engage power, and black controls are for positioning and adjusting. General rules specify that foot brakes are pushed in while hand brakes are pulled up, foot clutches are disengaged by pushing in and engaged when released, and engine throttles increase speed when moved upward or forward for hand controls and downward for foot controls. Red controls include ignition keys to shut off gasoline engines and fuel shut-off switches for diesel engines. Orange controls govern engine speed, transmissions, parking brakes, emergency brakes, and differential locks.