Learn how to read airport taxiway signs and markings, including colours, arrows, hold lines, ILS boundaries and common wrong-turn traps.
Airport taxiway signs and markings use colour, shape and position to show your location, route, boundaries and mandatory stops. Yellow lettering on black identifies where you are; black lettering on yellow points towards taxiways or destinations; red signs impose a restriction. Yellow pavement lines reinforce those instructions, while white markings usually belong to runways.
These conventions are broadly shared by ICAO-style airports and US airports in real-world aviation, and accurate flight simulators reproduce them. Local standards, temporary works and older simulator scenery can introduce differences, so use the published airport diagram alongside what you see outside.
What do airport taxiway sign colours mean?
Black identifies your present location, yellow provides routing information, and red carries a mandatory instruction or prohibition.
| Appearance | Meaning | How to read it |
|---|---|---|
| Yellow letters on black | Location sign | A black sign marked B means the aircraft is on Taxiway Bravo. |
| Black letters and arrows on yellow | Direction sign | A with a left arrow means Taxiway Alpha is reached by turning left. |
| Black destination wording on yellow | Destination sign | Points towards an apron, cargo area, terminal or other named destination. |
| White letters or symbols on red | Mandatory instruction | Marks a runway holding position, protected critical area or no-entry restriction. Stop and comply with the applicable clearance or procedure. |
| White horizontal bar symbol on red | No entry | Do not enter from that direction, even if the pavement appears usable. |
The practical memory aid is black is where you are; yellow is where you can go; red demands action. A red runway sign does not mean the runway is closed. It normally identifies the runway boundary ahead.
How do taxiway pavement markings work?
A continuous yellow centreline marks the normal taxi path, but following it does not by itself authorise an aircraft to cross a runway or enter a restricted area.
| Marking | Meaning |
|---|---|
| Single continuous yellow line | Taxiway centreline; keep the nose wheel near it while checking wingtip clearance. |
| Black panel with yellow characters | Surface-painted location marking showing the taxiway occupied. |
| Yellow panel with black characters or arrow | Surface-painted direction or routing information. |
| Two continuous yellow edge lines | Taxiway edge; pavement beyond is generally not intended for aircraft use. |
| Two dashed yellow edge lines | Boundary with adjoining usable pavement, commonly an apron, under standards that use this convention. |
| Two solid and two dashed yellow lines | Runway holding position marking. |
| Extra yellow dashes beside the centreline | Enhanced centreline warning that a runway holding position is approaching; it is not the stop line itself. |
| Yellow X | Closed taxiway. A white X is normally used on a closed runway. |
| Yellow chevrons | Blast-pad, stopway or similar pavement unavailable for normal taxi, take-off or landing. |
At many US airports, one solid and one dashed yellow line marks the boundary between non-movement and ATC-controlled movement areas. It has two lines rather than the four used at a runway hold. This convention is not universal, so check the airport diagram and local procedure.
Once a taxiway enters a ramp, stand lead-in lines and operator markings may take over. Our explanation of how taxiways, aprons, ramps and stands differ helps distinguish an ATC taxi route from parking guidance.
Which side of a runway hold line do I stop on?
Stop on the side with the two solid lines and keep the entire aircraft behind them. The common mnemonic is solid side means stop side.
When approaching a runway from a taxiway, the solid lines face the aircraft. When vacating the runway, the dashed lines appear first; cross the complete marking before reporting clear. The tail, not merely the cockpit or main wheels, must be beyond the boundary.
A red sign such as 09–27 identifies the runway being entered or crossed. The numbers normally correspond to the runway’s approximate magnetic directions, but they do not tell you which direction is active and never grant permission to proceed.
Do not cross a runway holding position merely because the yellow centreline continues ahead. At an ATC-controlled airport, obtain the required explicit clearance. At an uncontrolled airport, stop and follow the applicable traffic, radio and runway-entry procedures.
An ILS critical-area hold is a separate protected boundary and may sit farther from the runway. It commonly uses a ladder-style pavement marking and associated mandatory sign; see our detailed guide to recognising ILS holding-position markings rather than treating it as an ordinary runway hold.
How do I read several taxiway signs at an intersection?
Find the black location panel first, then read the yellow direction panels and their arrows. For example, a black B says the aircraft is on Bravo; a yellow A with a left arrow directs you to Alpha; a yellow C with a right arrow directs you to Charlie.
Taxiway letters are spoken phonetically: A is Alpha, B is Bravo and A1 is Alpha One. Multiple-letter identifiers such as AA are usually spoken Alpha Alpha.
Follow the arrow rather than relying solely on which side of the sign the panel occupies. Sign arrays are arranged to aid interpretation, but restricted space and local layouts can make their physical placement less intuitive. A direction sign tells you where a route leads; it does not confirm that ATC assigned that route or that your aircraft’s wingspan is permitted on it.
What do taxiway lights add at night?
Blue lights mark taxiway edges, green lights mark centrelines, flashing yellow guard lights warn of a runway boundary, and a red stop bar means stop. Not every taxiway has centreline lighting, so the absence of green lights does not automatically mean it is closed.
Never treat green lights continuing towards a runway as crossing clearance. If an illuminated red stop bar or runway-status light conflicts with an instruction, remain stopped and query ATC rather than assuming the light is faulty. Simulator lighting logic can be simplified or incorrect, but the realistic procedure is still to treat red as a stop indication.
How should I use taxiway signs with an airport chart?
Use the airport diagram to plan the route, then use signs and markings to verify each segment as you taxi.
- Write down the route. Break a clearance into segments such as
A – A3 – B – hold 27. - Confirm your location. Find a black location sign before moving or after every turn.
- Check the next junction. Match the yellow direction sign and arrow with the next identifier on the route.
- Track the centreline. Keep the nose wheel close to it, but continue checking wingtip and tail clearance.
- Stop and verify boundaries. Treat red signs, four-line runway holds, ILS markings and illuminated stop bars as decision points rather than ordinary junctions.
In real operations, stop clear of the intersection or runway and tell ATC if your position is uncertain. In a simulator, match the airport chart, navigation data and scenery generation when practising procedures. Updating navigation data alone usually does not redraw old taxiway pavement, 3D signs or renamed intersections.
Common taxiway sign and marking mistakes
- Reading a yellow direction panel as the taxiway presently occupied; the black panel gives the location.
- Following a centreline through a runway hold because it appears continuous.
- Stopping with the cockpit behind the line while the nose or another part of the aircraft projects across it.
- Taxiing beyond solid edge lines because the adjoining pavement looks wide enough.
- Assuming a centreline guarantees wingtip clearance for every aircraft size.
- Trusting outdated simulator signs when they conflict with the airport layout being used for procedural practice.