Page 377 - Planning and Design of Airports

328 Airp o r t D e sign

RUNWAY

PAVEMENT
EDGE
50' (15 m) MAX.
ON CURVES
INBOARD OR
OUTBOARD
YELLOW STRIPES
100' (30 m) 3' (1 m) WIDE
MAX. ON EXTEND TO WITHIN
STRAIGHT 5 FEET (1.5 m) OF
SECTIONS PAVEMENT EDGE OR
25 FEET (7.5 m)
IN LENGTH,
WHICHEVER IS LESS
TAXIWAY EDGE
MARKINGS

FIGURE 8-27 Taxiway shoulder markings.

Enhanced Taxiway Markings
Beginning in 2008, all airports serving commercial air carriers are
required to mark certain critical areas of the airfield with enhanced
taxiway markings. These markings are designed to provide addi-
tional guidance and warning to pilots of runway intersections.
Enhanced markings consist primarily of yellow-painted lines, using
paint mixtures with imbedded glass beads to enhance visibility. In
addition, yellow markings must be marked on top of a darkened
black background.
Taxiway centerlines are enhanced for 150 ft from the runway
hold-short markings. The centerline enhancements include dashed
yellow lines 9 ft in length, separated longitudinally by 3 ft. These
yellow lines are placed 6 in from each end of the existing centerline.
An example of enhanced marking is illustrated in Fig. 8-28.

Closed Runway and Taxiway Markings
When runways or taxiways are permanently or temporarily closed to air-
craft, yellow crosses are placed on these trafficways. For permanently