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Japanese-style ATC cab signalling indicator. Automatic train control (ATC) is a general class of train protection systems for railways that involves a speed control mechanism in response to external inputs. For example, a system could effect an emergency brake application if the driver does not react to a signal at danger.
Air traffic controllers are generally individuals who possess superior situational awareness, spatial awareness, and are well organized.Other skills that are essential include a fast processing of numeric computations and mathematics, assertive and firm decision-making skills, the ability to maintain their composure under pressure, and an excellent short-term memory.
Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled airspace. The primary purpose of ATC is to prevent collisions, organize and expedite the flow of traffic in ...
An ATC ground station consists of two radar systems and their associated support components. The most prominent component is the PSR. It is also referred to as skin paint radar because it shows not synthetic or alpha-numeric target symbols, but bright (or colored) blips or areas on the radar screen produced by the RF energy reflections from the target's "skin."
The system uses the airport's listed frequency ( 121.725 or 135.075 ). The system is activated with four "key clicks" on the VHF radio to contact the appropriate ATC facility or six "key strokes" to contact the FSS. There is a timer on the modem connection. If no voice is heard for a preset interval, the system disconnects.
Cycle lengths of signalized intersections are determined by small gears that are located within dial timers. Cycle gears, as they are commonly known, range from 35 seconds to 120 seconds. [citation needed] If a cycle gear in a dial timer results in a failure, it can be replaced with another cycle gear that would be appropriate to use. Since a ...
Air traffic control towers are elevated structures for the visual observation and control of the air and ground traffic at an airport. [1] The placement and height of an ATC tower are determined by addressing the many FAA requirements and site-specific considerations to ensure safety within the National Airspace System (NAS).
Advanced Civil Speed Enforcement System (ACSES) is a positive train control cab signaling system developed by Alstom. [1] The system is designed to prevent train-to-train collisions, protect against overspeed, and protect work crews with temporary speed restrictions.
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