What is the minimum width of centerline markings for non-precision and precision-approach runways?

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The main idea here is visibility and standardization of runway markings so pilots can easily follow the centerline during approach and landing as well as during rollout. For both non-precision and precision-approach runways, the centerline marking is specified to be wide enough to be clearly seen from a distance and under different lighting and weather conditions, while still leaving room for other nearby markings on the pavement. A width of 36 inches provides a strong, continuous guide that is easy to distinguish from other markings and rubber buildup on the surface. Narrower options would reduce legibility, making it harder to stay centered, especially at speed or in low visibility. A much wider line would be excessive and could interfere with surrounding markings or take up unnecessary space.