What does a red background with a white inscription indicate?

A red background with a white inscription signifies an entrance to runways and critical areas, highlighting their importance for safe operations at an airfield. This visual cue is crucial because it alerts personnel to areas where extra caution and regulated access are required due to the presence of aircraft or ongoing operations.

The red color is universally recognized in aviation as a signal for hazards or critical areas, making it essential for drivers, pilots, and ground personnel to be aware of their surroundings and follow established protocols when approaching these zones. This is crucial for maintaining safety and preventing incidents on the airfield.