What signifies the runway distance remaining?

The correct choice indicates that white numbers on a black background are the standard representation for runway distance remaining. This format is designed to ensure high visibility for pilots and ground personnel, making it easy to read and interpret from a distance, particularly during landing or takeoff procedures. The contrast of white numbers against a black background enhances visibility in various lighting conditions, effectively conveying critical information.

For those learning about runway markings, it's important to note that different systems and colors are employed for other purposes. Options that include red numbers or combinations with yellow might relate to different indicators, such as warning signs or obstacles, but not specifically to runway distance remaining. Understanding these distinctions is crucial for safe operations within the airport environment.