Airport Operations

Airport signs and markings: read the color first

As of August 11, 2026, the FAA defines exactly six airport sign types in AIM 2-3-7, and only one of them — the mandatory instruction sign — uses a red background with a white inscription. Every other sign you meet while taxiing is yellow or black, and the background color alone tells you whether the sign is an order, a position report, or a suggestion.

See all six sign types Quiz yourself on airport signs

Sign types (AIM 2-3-7)

Red background

Mandatory only

Last “1” distance sign

≥ 950 ft from end

Primary-source check: FAA AIM Chapter 2, Section 3 — Airport Marking Aids and Signs (paragraphs 2-3-5 and 2-3-7 through 2-3-13), Pilot’s Handbook of Aeronautical Knowledge, Chapter 14, and AC 150/5340-18, Standards for Airport Sign Systems. Last verified: 2026-08-11; date_retrieved: 2026-08-11. Colors and pilot actions on this page are read directly from the AIM paragraph named in each row.

The Six Sign Types

Every FAA airport sign, its colors, and what it obliges you to do

Background color carries the authority; the inscription color carries the contrast. Red is the only color that means stop. Everything else is information you act on with judgment.

Sign type	Background	Inscription	What it means	Pilot action	Source
Mandatory instruction sign	Red	White	Entrance to a runway, a critical area, or an area you may not enter.	Stop. Do not cross without a specific ATC clearance.	AIM 2-3-8
Location sign	Black	Yellow, with a yellow border	The taxiway or runway you are on right now. No arrows.	Confirm your position against the airport diagram before you move on.	AIM 2-3-9
Direction sign	Yellow	Black	Intersecting taxiways leading out of the intersection ahead, each with one arrow.	Read it before the intersection — it is normally posted on the left, prior to the turn.	AIM 2-3-10
Destination sign	Yellow	Black	A taxi route to a place on the airport — RWY, APRON, FBO, CARGO, TERM, MIL.	Follow the arrow; a destination sign always carries one.	AIM 2-3-11
Information sign	Yellow	Black	Local information: areas invisible from the tower, frequencies, noise abatement.	Advisory only. The airport operator decides where these go.	AIM 2-3-12
Runway distance remaining sign	Black	White numeral	Thousands of feet of landing runway remaining.	Use it as a go/no-go reference; the “1” sign sits at least 950 feet from the end.	AIM 2-3-13

The Pairs That Get Missed

Four sign pairs that share a color scheme

Knowing the six colors is not the same as reading a sign array at a hot spot. These four pairs are where the color alone stops being enough.

Location sign vs. runway boundary sign

Black/yellow vs. yellow/black — the scheme is inverted

A location sign names where you are and has a yellow border. A runway boundary sign faces the runway, shows a graphic of the holding-position marking, and tells you when you are clear of the runway (AIM 2-3-9).

Direction sign vs. destination sign

Both yellow background, black inscription

A direction sign lists intersecting taxiway designations. A destination sign names a place — a runway, apron, terminal or FBO — and always has an arrow (AIM 2-3-10, 2-3-11).

Runway holding position sign vs. LAHSO holding position sign

Both red background, white inscription

The LAHSO sign is installed on the runway at the hold-short point and its numbers carry a black border. The ordinary holding position sign sits on the taxiway beside the pavement markings (AIM 2-3-8, PHAK Ch. 14).

Holding position sign vs. holding position marking

Red sign vs. four yellow lines on the pavement

The sign is the visual cue; the marking is the stop line. Two solid and two dashed yellow lines, solid side always on the holding side — that is where no part of the aircraft may pass (AIM 2-3-5).

Airport Signs FAQ

Q1A mandatory instruction sign located at a runway holdline will be what color?

Red background with a white inscription. AIM 2-3-8 defines mandatory instruction signs that way, and a runway holding position sign is the most common one: it carries the designation of the intersecting runway, such as 15-33, arranged to match the respective runway thresholds.

Q2What are the six types of airport signs?

AIM 2-3-7 enumerates exactly six: mandatory instruction signs, location signs, direction signs, destination signs, information signs, and runway distance remaining signs. Only mandatory instruction signs use a red background; only location and runway distance remaining signs use a black one.

Q3What color are taxiway direction signs?

Yellow background with a black inscription, each taxiway designation accompanied by one arrow showing the direction of the turn. AIM 2-3-10 also fixes the layout: the designations are arranged clockwise starting from the first taxiway on your left, and the sign is normally posted on the left prior to the intersection.

Q4What does a black sign with yellow letters and a yellow border mean?

It is a location sign — the taxiway or runway you are currently on (AIM 2-3-9). It never carries an arrow. Its surface-painted equivalent is also a black background with a yellow inscription, painted to the right of the centerline.

Q5How do you tell a direction sign from a destination sign?

Both are yellow with black inscriptions. A direction sign names intersecting taxiways you could turn onto. A destination sign names a place on the airport — a runway, APRON, FBO, CARGO, TERM or MIL — and always has an arrow. When one destination sign lists two places sharing a taxi route, a dot separates them and a single arrow is used.

Q6What does the number on a runway distance remaining sign mean?

Thousands of feet of landing runway remaining, on a black background with a white numeral (AIM 2-3-13). A sign reading 2 means 2,000 feet remain. The last sign in the series, numeral 1, is located at least 950 feet from the runway end.

Where this fits in the rest of the ground school

Runway incursion prevention — the holding-position markings these signs annotate, and the geometry that causes incursions.
Pilot’s Handbook of Aeronautical Knowledge — Chapter 14 covers airport operations end to end.
Private Pilot ACS — airport signs and markings are examined under the airport operations task.
Private pilot oral exam prep — DPEs hand you a sign array and ask what you would do.

Turn the table into recall

Sign questions are written-test questions: the exam gives you a color and asks for the obligation. Drill them until the color-to-action jump is automatic, then read the array instead of decoding it.

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