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Indeed USA deviates from ICAO: Zeros are not used to precede single-digit runway markings. An optional configuration of the numeral 1 is available to designate a runway 1 and to prevent confusion with the runway centerline. Source: USA AIP - GEN 1.7 Differences From ICAO SARPs in ICAO SARPs Annex 14 (Aerodromes) is as follows (emphasis ...

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