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aircraft should be kept centered over this line during
taxi. However, being centered on the taxiway
centerline does not guarantee wingtip clearance with
other aircraft or other objects.
2. Enhanced Centerline. At some airports,
mostly the larger commercial service airports, an
enhanced taxiway centerline will be used. The
enhanced taxiway centerline marking consists of a
parallel line of yellow dashes on either side of the
normal taxiway centerline. The taxiway centerlines
are enhanced for a maximum of 150 feet prior to a
runway holding position marking. The purpose of
this enhancement is to warn the pilot that he/she is
approaching a runway holding position marking and
should prepare to stop unless he/she has been cleared
onto or across the runway by ATC. (See FIG 2-3-8.)
c. Taxiway Edge Markings. Taxiway edge
markings are used to define the edge of the taxiway.
They are primarily used when the taxiway edge does
not correspond with the edge of the pavement. There
are two types of markings depending upon whether
the aircraft is suppose to cross the taxiway edge:
1. Continuous Markings. These consist of a
continuous double yellow line, with each line being
at least 6 inches (15 cm) in width spaced 6 inches
(15cm) apart. They are used to define the taxiway
edge from the shoulder or some other abutting paved
surface not intended for use by aircraft.
2. Dashed Markings. These markings are
used when there is an operational need to define the
edge of a taxiway or taxilane on a paved surface
where the adjoining pavement to the taxiway edge is
intended for use by aircraft, e.g., an apron. Dashed
taxiway edge markings consist of a broken double
yellow line, with each line being at least 6 inches
(15cm) in width, spaced 6 inches (15 cm) apart (edge
to edge). These lines are 15 feet (4.5 m) in length with
25 foot (7.5 m) gaps. (See FIG 2-3-9.)
d. Taxi Shoulder Markings. Taxiways, holding
bays, and aprons are sometimes provided with paved
shoulders to prevent blast and water erosion.
Although shoulders may have the appearance of full
strength pavement they are not intended for use by
aircraft, and may be unable to support an aircraft.
Usually the taxiway edge marking will define this
area. Where conditions exist such as islands or
taxiway curves that may cause confusion as to which
side of the edge stripe is for use by aircraft, taxiway
shoulder markings may be used to indicate the
pavement is unusable. Taxiway shoulder markings
are yellow. (See FIG 2-3-10.)
AIM 2/14/08
2-3-8 Airport Marking Aids and Signs
FIG 2-3-6
Markings for Blast Pad or Stopway or Taxiway Preceding a Displaced Threshold
2/14/08 AIM
Airport Marking Aids and Signs 2-3-9
FIG 2-3-7
Markings for Blast Pads and Stopways
AIM 2/14/08
2-3-10 Airport Marking Aids and Signs
FIG 2-3-8
Enhanced Taxiway Centerline
FIG 2-3-9
Dashed Markings
DOUBLE
YELLOW
LINES
TAXIWAY EDGE
MARKINGS
CONTINUOUS
TAXIWAY EDGE
MARKINGS
DASHED
e. Surface Painted Taxiway Direction
Signs. Surface painted taxiway direction signs have
a yellow background with a black inscription, and are
provided when it is not possible to provide taxiway
direction signs at intersections, or when necessary to
supplement such signs. These markings are located
adjacent to the centerline with signs indicating turns
to the left being on the left side of the taxiway
centerline and signs indicating turns to the right being
on the right side of the centerline. (See FIG 2-3-11.)
FIG 2-3-10
Taxi Shoulder Markings
YELLOW STRIPES
PAVEMENT EDGE
TAXIWAY EDGE
MARKINGS
RUNWAY
f. Surface Painted Location Signs. Surface
painted location signs have a black background with
a yellow inscription. When necessary, these markings
are used to supplement location signs located along
side the taxiway and assist the pilot in confirming the
designation of the taxiway on which the aircraft is
located. These markings are located on the right side
of the centerline. (See FIG 2-3-11.)
g. Geographic Position Markings. These markings
are located at points along low visibility taxi
routes designated in the airport's Surface Movement
Guidance Control System (SMGCS) plan. They are
used to identify the location of taxiing aircraft during
low visibility operations. Low visibility operations
are those that occur when the runway visible
range(RVR) is below 1200 feet(360m). They are
positioned to the left of the taxiway centerline in the
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