出典:Wiktionary
control tower (複数形 control towers)
出典:Wikipedia
出典:『Wikipedia』 (2011/08/09 14:37 UTC 版)
A control tower, or more specifically an Air Traffic Control Tower (TWR), is the name of the airport building from which the air traffic control unit controls the movement of aircraft on and around the airport. Control towers are also used to control the traffic for other forms of transportation such as rail transport (see illustration below), sea port or moveable bridges. Most of the world's airports are non-towered or mandatory frequency — only a minority of airports have enough traffic to justify a control tower, though some airports may open temporary tower units during special events like an airshow. Control towers are also located on aircraft carriers.