North American Airport Signs
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Sign Location Pilot Action/Sign Purpose
On taxiways at intersection with runway and at runway/runway intersection Do not cross unless clearance has been received (towered airport) or until clear (nontowered airport). At runway/runway intersections, hold short if land and hold-short clearance has been accepted.
Hold position on taxiway located in runway approach or departure area hold Controlled Airport - Hold when instructed by ATC.

Noncontrolled Airport - Proceed when no traffic conflict exists.
ILS Critical Area Hold when instructed by ATC when approaches are being made with visibility less than 2 miles or ceiling less than 800 feet.
Areas where aircraft are forbidden to enter Do not enter. Identifies paved areas where aircraft entry is prohibited.
Taxiway Identifies taxiway on which aircraft is located.
Runway Identifies runway on which aircraft is located.
Edge of protected area for runway These signs are used on controlled airports to identify the boundary of the runway protected area. It is intended that pilots exiting this area would use this sign as a guide to judge when the aircraft is clear of the protected area.
Edge of ILS critical aarea These signs are used on controlled airports to identify the boundary of the ILS critical area. It is intended that pilots exiting this area would use this sign as a guide to judge when the aircraft is clear of the ILS critical area.
Taxiways and Runways On Taxiways - Provides direction to turn at next intersection to maneuver aircraft onto named taxiway.

On Runways - Provides direction to turn to exit runway onto named taxiway.
Taxiway Provides general taxiing direction to named runway.
Taxiways and Runways Provides general taxiing direction to identified destination. Other destinations signs include directions to taxiway, runway.
Runway Provides remaining runway length in 1,000 feet increments.
HS-1 Land and Hold Short point for other than intersecting runways as instructed by ATC.
Taxiway ending marker Indicates taxiway does not continue.