An aerodrome talks to you in paint and signs, and learning its language keeps you in the right place on a busy, fast-moving surface. The markings and signs are standardised the world over, so once you can read them at one airport you can read them at almost any, and the most important of them exist for one reason above all: to stop you ending up on a runway when you should not be.
This is general educational information, not operational, legal, or regulatory advice. Rules differ by authority and change over time. Always verify against current official sources and follow your operator's approved procedures.
White for runway, yellow for taxiway
Start with the single rule that orients everything: runway markings are white, and taxiway markings are yellow. That colour code, set out in ICAO Annex 14 and mirrored by the FAA, lets you tell instantly whether a painted line belongs to a runway or a taxiway, even at speed, at night or in poor visibility. Because the scheme is an international standard, the markings you learn at your home field are essentially the markings you will find anywhere, which is exactly the point: a common language no pilot has to relearn on arrival.
Reading the runway
The white markings on a runway each carry specific information, and together they tell you where to land and where to aim:
- the runway designation, the large number at each end, is the runway's magnetic heading rounded to the nearest ten degrees with the last digit dropped, so runway 27 points roughly 270 degrees; an L, C or R distinguishes parallel runways as left, centre or right;
- the centreline, a dashed white line down the middle, for tracking and lineup;
- the threshold markings, the set of longitudinal stripes, often called the piano keys, that mark the start of the landing area and indicate the runway width by their number;
- the aiming point, two broad stripes a set distance in from the threshold, giving you a fixed visual touchdown target;
- the touchdown zone markings, pairs of stripes at intervals beyond the threshold, marking distance along the runway.
Read together, these turn a strip of tarmac into a calibrated landing surface: the threshold tells you where it begins, the aiming point where to put the wheels, and the touchdown zone how much runway has gone by.
Displaced thresholds
Sometimes the landing area does not start at the very beginning of the paved surface. A displaced threshold is marked by arrows along the centreline leading up to a solid threshold bar, and it means the paved area before the threshold is not available for landing, usually because of an obstacle on the approach or a noise consideration. That area may still be usable for the take-off run and for taxiing, so the pavement is not wasted, but you do not touch down on it. The displaced threshold is one reason the declared distances for landing and take-off on the same runway can differ.
The markings that matter most: holding positions
Of all the markings, the runway-holding position is the one to know cold, because crossing it wrongly is a runway incursion, among the most serious ground hazards in aviation. It is marked by two solid yellow lines and two dashed yellow lines together. You approach from the solid side, and at a towered airport you must not cross onto the runway side without a clearance; at a non-towered field there is no clearance to receive, but the same line marks where to hold and confirm the runway is clear before you enter. The solid-then-dashed pattern even tells you which way matters: the solid lines face the side that must hold. Holding short at these lines until cleared is the single ground habit that prevents the largest category of serious surface conflicts.
The signs and their colours
Aerodrome signs are colour-coded so their meaning is unmistakable:
- Mandatory instruction signs: red background, white text. These include runway-holding positions (showing the runway designations, such as "09-27"), no-entry signs and ILS critical-area holds. You must not pass them without authority.
- Location signs: black background, yellow text. These tell you where you are, such as the taxiway you are currently on.
- Direction signs: yellow background, black text with arrows, pointing the way to taxiways or the runway.
- Information and destination signs add further guidance, such as the direction to a terminal or a runway entrance.
The red signs are the ones that stop you; the black and yellow ones tell you where you are and where to go. Pairing the signs with the markings, a red holding-position sign beside the yellow holding-position lines, gives you two independent confirmations of the same critical boundary.
Hot spots and incursions
Some parts of an aerodrome are simply more confusing than others, a complex intersection, a taxiway that crosses a runway at an odd angle, a place where aircraft have nearly gone astray before. These are designated hot spots, highlighted on the aerodrome chart and sometimes with extra signage and markings, to flag where extra care pays off. Knowing where the hot spots are before you taxi, and reading the markings and signs continuously rather than glancing at them, is how you keep a routine taxi from becoming an incursion.
Lights as well as paint
By night and in poor visibility the paint gives way to lights, and they carry their own colour code under ICAO Annex 14 that is worth knowing alongside the markings. Runway edge lights are white, turning amber in the last portion of the runway to warn you that the end is near; the threshold is marked by green lights and the runway end by red, so a runway shows green to an aircraft approaching to land and red to one rolling off the far end. Taxiway lighting reverses the emphasis: taxiway edge lights are blue and taxiway centreline lights are green, so a taxiway reads blue and green where a runway reads white and amber.
The same safety priority that makes the holding-position markings critical applies to the lights. Many runway-holding positions add stop bars, a row of red lights across the taxiway, and a lit red stop bar means do not cross, even if you believe you have a clearance, until it is switched off for you. Reading the lights is simply the night-time version of reading the paint: white and amber for the runway, blue and green for the taxiway, red for the boundaries you do not cross without authority.
A worked example
You have landed and are taxiing to the apron. You cross a set of yellow lines and read a black sign with yellow text saying "B": you are now on taxiway Bravo, the location sign confirming where you are. A yellow sign with black text and an arrow points left to taxiway Charlie, so you know your options ahead.
As you approach the apron route, you see two solid yellow lines and two dashed yellow lines across your path, with a red sign, white text, reading "09-27". That is the runway-holding position for runway 09-27, and you are approaching from the solid side. You stop and hold short, because crossing onto the runway side without a clearance would be a runway incursion. You hold there until cleared, then continue, having read your way across the airfield entirely from its paint and signs.
Common pitfalls
- Forgetting the colour code. White is runway, yellow is taxiway; mixing them up loses your orientation on the ground.
- Crossing holding-position markings without clearance. The solid-then-dashed lines are a hard stop; hold until cleared to cross or enter.
- Landing on a displaced-threshold area. The pavement before a displaced threshold is not for landing, even though it may be used for take-off or taxi.
- Treating signs as decoration. Red signs are mandatory and must not be passed without authority; read them continuously as you taxi.
- Ignoring hot spots. The known confusing spots are flagged for a reason; brief them before you move.
In Pilot EFB
Pilot EFB is a study and planning companion for the aerodrome environment, helping you learn the markings and signs and brief the taxi before you fly, alongside the aerodrome chart and the rest of your offline-first briefing. It does not show your position on the airfield, read the signs, or taxi the aircraft, and what you act on is what you see out of the window and the clearances you receive. Pilot EFB is not a certified Electronic Flight Bag, so treat it as a study and planning aid and taxi from your official sources.