These signs are on those airfields where arrester barriers, or arresting cables, are installed. These signs are used when it is necessary to hold an aircraft on a taxiway at a location other than the normal holding position when the ILS (instrument landing system) is being used. ILS critical area holding position signs. These signs located at the holding position on the taxiway have the designation of the approach end of the runway followed by a dash (-) and the letters APCH. These signs are put up if the aircraft are required to hold on a taxiway located in the approach or departure areas. Runway approach area holding position signs. In addition to showing the approximate runway alignment, the arrow indicates the direction to the runway threshold of the designated runway. If the sign is located on a taxiway that intersects the intersection of two runways, both runways are designated. On taxiways that intersect the beginning of the takeoff runway, only the designation of the takeoff runway appears on the sign, while all other signs designate both runway directions. These signs are located at the holding position on taxiways that intersect a runway or on runways that intersect other runways. They may be installed on either one or both sides of the runway. These have a black background with white inscription indicating the distance of the remainding landing run in thousands of feet. Information signs include direction signs, location signs, destination signs, runway exit signs, and runway-vacated signs. They provide information such as applicable radio frequencies, areas not visible from ATC (air traffic control), and noise abatement procedures. These have a yellow background with black inscription. Destinations commonly shown are runways, aprons, terminal areas, international areas, and fixed base operations. These have a yellow background with black inscription, indicating a destination on the airport. These signs are arranged clock-wise, starting from the first taxiway on the pilot's left. Each designation has an arrow indicating the direction of the turn. The inscription identifies the designation(s) of the intersecting taxiway(s) leading out of the intersection that a pilot would normally be expected to turn onto or hold short of. These signs have a yellow background with black inscription. These signs have yellow inscription with a black background. The signs in this category indicate taxiway locations, runway locations, runway boundaries, and ILS critical boundaries. These signs identify either a taxiway or a runway on which aircraft is located. The signs in this category are for indicating runway holding position, runway approach area holding position, ILS (instrument landing system) critical area holding position, and no-entry signs. These have a red background with white inscription and are used to denote areas where an aircraft is prohibited from entering and an entrance to a runway critical area. The signs also give information and indicate certain mandatory instructions. Signs installed on airfields to indicate locations, directions, destinations, and the remaining runway distance.
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