What color are taxiway directional signs?

Taxiway directional signs are standardized in appearance to ensure pilots and ground vehicle operators can quickly and easily identify them. The use of yellow backgrounds with black text is a key design choice that increases visibility and contrast, especially in varying lighting conditions typical around airports. This color scheme was developed to promote clarity and prevent misinterpretation, as the black font stands out against the bright yellow background, making it easy to read from a distance. Taxiway directional signs specifically convey critical information about the taxiways, their directions, and intended routes to pilots and ground personnel, enhancing safety on the airfield.

Other color combinations, such as red with white font, green with white font, or black with yellow font, do not align with the established standards for taxiway directional signage and are instead used for different purposes in airport operations. Red signs are typically associated with stop or prohibited areas, while green usually indicates runways. Black with yellow font is more commonly used for warnings or general information, which are not applicable to directional guidance.