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Sedona Airport, in Arizona 's Verde Valley, is one of the many airports that operate without a control tower. In aviation, a non-towered airport is an airport without a control tower, or air traffic control (ATC) unit. The vast majority of the world's airports are non-towered. [citation needed] In the United States, there are close to 20,000 ...
The airspace class designation is in effect only during the hours of tower and approach operation at the primary airport; the airspace reverts to Class D if approach control is not operating, and to class E or G if the tower is closed. The vertical boundary is usually 4,000 feet (1,200 m) above the airport surface.
Panopticon. This plan of Jeremy Bentham's panopticon prison was drawn by Willey Reveley in 1791. The panopticon is a design of institutional building with an inbuilt system of control, originated by the English philosopher and social theorist Jeremy Bentham in the 18th century. The concept is to allow all prisoners of an institution to be ...
Anchorage Air Route Traffic Control Center. Atlanta Air Route Traffic Control Center. Boston Air Route Traffic Control Center. Chicago Air Route Traffic Control Center. Cleveland Air Route Traffic Control Center. Denver Air Route Traffic Control Center. Fort Worth Air Route Traffic Control Center.
Smog tower. Smog towers or smog free towers (see below for other names) are structures designed as large-scale air purifiers to reduce air pollution particles ( smog ). This approach to the problem of urban air pollution involves air filtration, and removal of suspended mechanical particulates such as soot, and requires energy or power.
Centralized traffic control ( CTC) is a form of railway signalling that originated in North America. CTC consolidates train routing decisions that were previously carried out by local signal operators or the train crews themselves. The system consists of a centralized train dispatcher 's office that controls railroad interlockings and traffic ...
Northern California TRACON (NCT) ( Terminal Radar Approach Control ), or NorCal TRACON for short (pronounced "nor-cal tray-con"), also known as NorCal Approach, is an air traffic control facility that provides safety alerts, separation, and sequencing of air traffic arriving, departing, and transiting the airspace and airports in Northern ...
On a rail transport system, signalling control is the process by which control is exercised over train movements by way of railway signals and block systems to ensure that trains operate safely, over the correct route and to the proper timetable. Signalling control was originally exercised via a decentralised network of control points that were ...