During a crash the force peak of the impact is absorbed by the ribs tending to flex and de-flex. The remaining amount of energy is then absorbed by the crumpling nature of the corrugated ribs.
However, polystyrene does little to absorb impact energy but distributes it over the head.
"Acrylic [has]... better impact strength, and better weatherablility than polystyrene"
"Fibre-reinforced polymeric waste can be treated by pyrolysis" ... [alternatively] ... "Reprocessing of problematic plastic scrap ... by using mechanical methods like milling ... has been tried successfully"
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