Markers - Import export

Where air transit routes are established their center lines should be marked with markers The markers shall be frangible and located along the center line of the air transit route The markers shall be spaced at intervals of not more than 60 m on straight sections and 15 m on curves The surface of the marker as viewed by a pilot shall be a rectangle with a height to width radio of approximately 1 to 3 and have a minimum area of 1.500 cm2 The marker shall show three vertical bands colored yellow, green and yellow respectively and shall not exceed 1 m above ground or snow level