as indicated [ below ]. A threshold marking helps identify the beginning of the runway that is available for landing. In some instances the landing threshold may be relocated or displaced. For narrower runways, the number of stripes can be as few as 4 for a 60 foot wide runway, or as many as 16 for a runway 200 feet or wider. A threshold marking shall be provided at the threshold of a paved instrument runway, and of a paved noninstrument runway where the code number is 3 or 4 and the runway is intended for use by international commercial air transport. The stripes of the threshold marking shall commence 6 m from the threshold. A runway threshold marking shall consist of a pattern of longitudinal stripes of uniform dimensions disposed symmetrically about the centre line of a runway as shown in [ the
figure ]. The touchdown zone markings identify the touchdown zone for landing operations and are coded to provide distance information in 500 feet( 150m) increments. These markings consist of groups of one, two, and three rectangular bars symmetrically arranged in pairs about the runway centerline, as shown in [ the figure ]. For runways having touchdown zone markings on both ends, those pairs of markings which extend
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