Instead of the seat absorbing the impact, the soft, metal roof does the job. And more seriously, do buses have crumple zones like cars do? If a bus were to ro

Instead of the seat absorbing the impact, the soft, metal roof does the job. And more seriously, do buses have crumple zones like cars do? If a bus were to roll over, is the passenger compartment designed to work like a roll cage? Or does it just collapse?