What color are the markings used for runway centreline, threshold, touchdown zone, and edge markings?

Runway markings such as the centerline, threshold, touchdown zone, and edge markings are standardized in aviation and are painted white. These white markings serve vital functions in guiding pilots and ensuring safe landings and takeoffs. The centerline helps ensure alignment during the approach, the threshold marking indicates the beginning of the runway usable for landing, the touchdown zone markings indicate the ideal landing area, and the edge markings delineate the usable edges of the runway.

The use of white for these critical runway markings enhances visibility against the background, particularly against the blue sky and the varied surface colors of the runway itself. This visibility is essential for aircraft pilots to ascertain their position and make safe operational decisions during flight.