This work is divided into three sections: area controllers, approach controllers and aerodrome controllers. Area controllers are responsible for a part of an airway, which is a corridor of airspace in which aircraft travel, and use radar screens to monitor the aircraft within this area and to keep them all at a safe distance apart both vertically and horizontally. Approach controllers have responsibility over the take-off and landing of all aircraft by using radar and radio contact with the pilots. Aerodrome controllers are responsible for the ground space, insuring that the runways are free for landing aircraft. They also then guide the landed aircraft to its parking position.