// Airport Operations

Markings & Signs

Twelve markings and signs you'll actually see on the ground: what they look like, what they mean, and why the colour is never an accident.

1Browse the glossary below, or jump straight to the quiz.
2Look at the marking or sign shown.
3Pick what it means from four options.

Visual glossary

Threshold markings

Parallel stripes across the full runway width marking the start of the part usable for landing.

Displaced threshold

Arrows before the threshold stripes: usable for taxi, take-off and roll-out, but not for landing.

Runway centreline

A dashed white line down the runway's centre for directional guidance.

Touchdown zone markers

Paired rectangles at intervals from the threshold, marking the touchdown zone.

Aiming point markers

Two wide rectangles a fixed distance beyond the threshold, a visual glideslope aim reference.

23
Runway designation number

Magnetic heading rounded to the nearest 10°, at the threshold. Parallel runways add L, C or R.

Closed runway marking

A large X at each end (and sometimes along the length) of a closed runway. Do not use.

Taxiway centreline

A single continuous yellow line down the taxiway centre, follow it to stay clear of the edges.

Taxiway edge markings

Two continuous yellow lines along the pavement edge: do not cross, the surface beyond may be unusable.

Runway holding position

Two dashed lines then two solid lines. Never cross the solid pair toward the runway without a clearance.

23-05
Mandatory instruction sign

White on red. A runway holding position, or another point you must not pass without clearance.

A
Location sign

Yellow on black, yellow border, no arrow. Identifies the taxiway or runway you are currently on.

B
Direction sign

Black on yellow, no border, with an arrow. Shows which taxiway to take ahead.

Quiz

Score 0 / 0

What does this mean?

// Ground school

The colour is the code

Markings: white for runway, yellow for taxiway

White markings belong to the runway. Yellow markings belong to taxiways. That single rule tells you, at a glance and even through a dirty windscreen, which surface you're looking at.

Signs: red stops you, yellow tells you where you are

Red signs are mandatory instructions, treat them like a stop sign until told otherwise. Yellow signs are informational: a location sign (bordered) says where you are, a direction sign (no border, with an arrow) says where a taxiway leads.

Solid lines mean stop, dashed lines mean you may proceed

At a runway holding position, the solid pair of lines is the one you don't cross toward the runway without a clearance (or, at a non-towered field, without confirming it's clear). Coming the other way, off the runway, the dashed lines tell you that you're clear of the runway once past them.

When signs and charts disagree

Airport layouts change. If a sign, marking or your chart seem to contradict each other, or anything looks unfamiliar, stop, ask ATC or Flight Information if available, and don't guess your way across a runway.