The skin-to-frame connection must be (shear and peel).
Before touching the skin, inspect the SR2 frame. ECE R66 requires that the superstructure itself be intact. A bent pillar will fail even with a new skin.
Modern engineering shows that the acts as a tension field beam. When the bus lands on its side, the skin stretches before tearing. That stretching absorbs kinetic energy. A thicker or precisely alloyed skin can delay tearing by milliseconds—milliseconds that preserve survival space.
