Because the repair slope matches the runway slope, how are the crater profile measurement test lanes related to the runway centerline?

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Multiple Choice

Because the repair slope matches the runway slope, how are the crater profile measurement test lanes related to the runway centerline?

When the repair slope is matched to the runway slope, the crater profile measurement lanes are laid out along the same direction as the runway’s length. That means they run parallel to the runway centerline. Measuring the crater profile this way captures how the surface changes along the runway’s axis, which is the direction the slope and drainage are designed for. If the lanes were perpendicular, you’d be looking at cross-slope rather than the longitudinal grade, and a 45-degree orientation would mix directions, making the data less representative of the runway’s actual incline. Starting from the shoulder simply describes a starting point, not the orientation of the measurement relative to the centerline.

When the repair slope is matched to the runway slope, the crater profile measurement lanes are laid out along the same direction as the runway’s length. That means they run parallel to the runway centerline. Measuring the crater profile this way captures how the surface changes along the runway’s axis, which is the direction the slope and drainage are designed for. If the lanes were perpendicular, you’d be looking at cross-slope rather than the longitudinal grade, and a 45-degree orientation would mix directions, making the data less representative of the runway’s actual incline. Starting from the shoulder simply describes a starting point, not the orientation of the measurement relative to the centerline.

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