What color are runway holding position signs?

Runway holding position signs are specifically designed to alert pilots when they are approaching a runway and must hold their position. These signs are universally recognized, and their color scheme is standardized for clarity.

The correct choice highlights that runway holding position signs are red with white lettering. This color combination is significant because red universally indicates a stop or hold, which is essential for ensuring safety in proximity to active runways. The white lettering provides a stark contrast that ensures that the message is easily readable from a distance, particularly during low visibility conditions.

In aviation, the meaning conveyed by colors is crucial. Red signifies caution and the need to halt, while the contrast in lettering enhances visibility. Thus, pilots are trained to recognize these signs immediately and react appropriately to avoid runway incursions.