Paragraph 39 Markings for Paved Runways and Taxiways
Two or more white crosses, as illustrated in this paragraph,
displayed on a runway or taxiway, with the arms of the crosses at an angle of 45° to the centre line of the runway, at intervals of not more than 300 metres signify that the section of the runway or taxiway marked by them is unfit for the movement of aircraft.
Two white continuous lines or two white broken lines and two continuous lines, as illustrated in this paragraph,
signify a holding position beyond which no part of an aircraft or vehicle shall project in the direction of the runway without permission from an air traffic control unit.
Orange and white markers, as illustrated in this paragraph,
spaced not more than 15 metres apart, signify the boundary of that part of a paved runway, taxiway or apron which is unfit for the movement of aircraft.