Normal Taxiway Centerline Markings
Taxiway centerline markings consist of a single continuous yellow line, 6 to 12
inches in width. The centerline markings provide pilots guidance to aid in
taxiing along the center of the taxiway.
Enhanced Taxiway Centerline Markings
The enhanced taxiway centerline marking may be used to warn a pilot of an
upcoming runway. It consists of yellow dashed lines on either
side of the normal taxiway centerline. These dashes extend up to 150 feet
prior to a runway holding position marking. They are used to aid pilots in
maintaining awareness during surface movement in order to reduce runway
incursions. In a runway incursion, a pilot enters a runway by mistake or
improperly. Runway incursion avoidance is extremely important, since a
runway incursion introduces the possibility of a collision between two aircraft
on the runway.
Taxiway Edge Markings
Taxiway edge markings consist of continuous double yellow lines, which are used
to define the taxiway edge from the adjacent surface or terrain. When the
pavement adjacent to the taxiway is usable by aircraft, then dashed lines are
used, instead of continuous lines.
Taxi Shoulder Markings
Areas usable for aircraft taxi are sometimes provided with paved shoulders.
These shoulders are not intended for taxi and cannot hold the weight of many
aircraft without being destroyed. Taxiway shoulder markings may be used in
these areas to help pilots identify them.
Surface Painted Taxiway Direction Signs
Sometimes taxiway direction signs are painted on the taxiway next to the taxiway
centerline to aid pilots in orientation and situational awareness during taxi.
The direction signs have a yellow background and a black inscription. If
the taxiway is to the left, the sign will be painted to the left side of the
taxiway centerline. If a right turn is indicated, the sign is painted on
the right side of the taxiway centerline.
Surface Painted Location Signs
Surface painted location signs are sometimes used to aid the pilot in confirming
the taxiway being used. These markings have a black background with a
yellow inscription, and are painted on the right side of the taxiway centerline.
Geographic Position Markings
At airports having low visibility taxi routes, geographic position markings may
be used to assist pilots taxiing along these routes during low visibilities.
When used, they are painted to the left of the taxiway centerline in the
direction of taxi. The marking is a circle comprised of an outer black
ring contiguous to a white ring with a pink circle in the middle. If
installed on a dark colored pavement, the white and black rings are reversed to
aid in visibility. These markings may contain either a number or letter,
which is used to identify position along a low visibility taxi route.
As a VFR pilot, you will not need to use geographic position markings. You
must simply not confuse them for another type of marking if you encounter one.
Closed Taxiway Markings
Temporarily closed taxiways are usually treated as hazardous areas and blocked
with barricades. As an alternative, a yellow cross may be installed at
each entrance to the taxiway.