What is the reference point for measuring outward deformation in corner posts?

The correct reference point for measuring outward deformation in corner posts is the corner fitting. This measurement is crucial because corner fittings are integral structural components of dry vans that provide connection points for securing cargo and engaging with handling equipment. By using corner fittings as the reference, it ensures that the measurement reflects accurate structural integrity and aligns with the designed specifications of the container.

Using corner fittings allows for consistent evaluation since they are standardized parts of container design. This way, any outward deformation can be effectively assessed in relation to a fixed structural element, which is key for ensuring that corner posts maintain their intended strength and functionality.

In contrast, other reference points like the top side rail, exterior surface, or interior surface could introduce discrepancies due to variations in container design, surface conditions, or measurement techniques, therefore making the corner fitting the most reliable point of reference for this specific type of measurement.