Page 358 - Planning and Design of Airports

Airport Lighting, Marking, and Signage 313

Maximum Longitudinal Spacing
1200 ft (365 m) Below 1200 ft
RVR and Above (365 m) RVR

Radius of curved centerlines
75 ft (23 m) to 399 ft (121 m) 25 ft (7.6 m) 12.5 ft (4 m)
25 ft (7.6 m)
400 ft (122 m) to 1199 ft (364 m) 50 ft (15 m) 25 ft (7.6 m)
≥1200 ft (365 m) 100 ft (30 m) 50 ft (15 m)
Acute-angled exits 50 ft (15 m) 50 ft (15 m)
Straight segments 100 ft (30 m) 50 ft (15 m)

TABLE 8-1 Taxiway Centerline Lighting Spacing

Taxiway centerline lights are in-pavement bidirectional lights placed
in equal intervals over taxiway centerline markings. Taxiway centerline
lights are green, except in areas where the taxiway intersects with a
runway, where the green and yellow lights are placed alternatively.
Research and experience have demonstrated that guidance from
centerline lights is superior to that from edge lights, particularly in
low visibility conditions. The spacing of the lights on curves and tangents
is given in Table 8-1 [21].
For normal exits, the centerline lights are terminated at the edge of
the runway. At taxiway intersections the lights continue across the inter-
section. For long-radius high-speed exit taxiways, the taxiway lights are
extended onto the runway from a point 200 ft back from the point of
curvature (PC) of the taxiway to the point of tangency of the central curve
of the taxiway. Within these limits the spacing of lights is 50 ft. These
lights are offset 2 ft from the runway centerline lights and are gradually
brought into alignment with the centerline of the taxiway.
Where the taxiways intersect with runways and aircraft are required
to hold short of the runway, several yellow lights spaced at 5-ft inter-
vals are placed transversely across the taxiway.
Runway Guard Lights
Runway guard lights (RGLs) are in-pavement lights located on taxi-
ways at intersections of runways to alert pilots and operators of airfield
ground vehicles that they are about to enter onto an active runway.
RGLs are located across the width of the taxiway, approximately 2 ft
from the entrance to a runway, spaced at approximately 10-ft intervals,
as illustrated in Fig. 8-17. RGLs are unidirectional, colored yellow for
aircraft facing the runway.