Runways, taxiways, and the apron area use a comprehensive system of signs and markings to aid aircraft movement. These start with standards for the runway surface. The markings and lines aircraft see on approach to the runway are carefully defined, including:
The runway threshold is first marked with a series of parallel white lines. The number of lines corresponds to the width of the runway.
The numbers that define the orientation follow (size and style).
A white canter line runs the full length of the runway.
Touchdown zones (pairs of rectangular markings).
An aiming point is often marked with large thick white bars (al these and others are better done by professionals).
