These lights consist of a row of red, unidirectional, elevated and in-pavement lights placed at the runway holding position (runway entrance or ILS critical area). Stop bar lights confirm the ATC clearance to enter or cross the active runway in low visibility conditions. These lights consist of elevated or in-pavement, alternately flashing yellow lights that identify the location of a runway holding position marking.Įlevated runway guard lights are called “wig-wag” lights because they blink on and off in an alternating fashion. Runway guard lights are installed at taxiways that provide access to an active runway and may be used in all weather conditions. These lights are installed at some taxiway holding positions to increase the conspicuity of the holding position in low visibility conditions and periods of darkness. These lights are steady burning and emit green light.Ĭlearance bar lights consist of three yellow in-pavement lights. Taxiway centerline lights are located along the taxiway centerline to facilitate ground traffic under low visibility conditions. These fixtures are steady burning and emit blue light. Taxiway edge lights outline the edges of taxiways during periods of darkness or restricted visibility conditions. A taxiway shoulder is not intended for use by aircraft. Shoulder markings are yellow stripes that are used where conditions exist, such as taxiway curves that may cause confusion as to which side of the edge stripe is for use by aircraft. Dashed lines are used when the adjoining pavement is intended to be used by aircraft (e.g., ramps and run-up areas). These markings typically consist of continuous double yellow lines. These markings have a yellow background with a black inscription.Įdge markings help define the taxiway’s edge, primarily when the taxiway edge does not correspond with the edge of the pavement. Surface painted taxiway direction signs are provided when it is not possible to provide taxiway direction signs at intersections or when necessary to supplement such signs. Either a number or a number and letter is positioned in the center of the pink circle. These markings are comprised of an outer white or black ring with a pink circle in the middle. Geographic position markings are located at points along low visibility taxi routes to identify taxiing aircraft’s location during low visibility operations. These markings have a black background with a yellow inscription. Surface painted location signs are located on the right side of the centerline to assist the pilot in confirming the taxiway on which the aircraft is located. However, being centered on the taxiway centerline does not guarantee wingtip clearance with other aircraft or objects. Ideally, the aircraft should be kept centered over this line during taxi. Normal taxiway centerline markings are a single continuous yellow line. These markings consist of two parallel, yellow-dashed lines located on either side of the normal taxiway centerline beginning approximately 150′ before a runway holding position marking. Enhanced taxiway centerline markings are used at larger airports to warn pilots that they are approaching a runway holding position marking.
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