According to ICAO conventions, runway surface markings are painted white. What is the standard color used for taxiway markings?

Introduction:
Surface marking colors differentiate movement areas. Internationally, runway markings are white to emphasize runway identity, while taxiway markings use a contrasting color for guidance on ground movement routes.

Given Data / Assumptions:

• Runway markings: white.
• Question asks for standard taxiway marking color.

Concept / Approach:

Taxiways require high visibility against asphalt/grass backgrounds and clear distinction from runways to prevent runway incursions. The widely adopted standard uses yellow for taxiway centerlines, edges, and holding position guidance (with additional surface signs as needed).

Step-by-Step Solution:

Verification / Alternative check:

Aerodrome design manuals and signage standards consistently show taxiway lines in yellow (often with black backgrounds for contrast near paved surfaces).

Why Other Options Are Wrong:

• Black/red/green: Not the standard line color for taxiways.
• White and black: White is reserved for runways; black is used as background panels, not as the marking color itself.

Common Pitfalls:

• Confusing surface painted signs (which may use multiple colors) with line color conventions.
• Assuming runway and taxiway share identical color schemes.

Final Answer:

yellow