Which safety feature, initially ridiculed as unnecessary when introduced by Volvo in 1959, later became standard in all vehicles and is credited with saving over one million lives worldwide?

Product design in transportation has often been driven by safety innovations that later became industry standards. Some design elements we take for granted today were once revolutionary breakthroughs that faced resistance before becoming universal features. This poll tests your knowledge about pivotal transportation safety design innovations that transformed the industry and saved countless lives.

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Three-point seatbelt (that Volvo deliberately left as an open patent for all manufacturers to use)
Crumple zones (designed to absorb impact energy during a collision)
Padded dashboards (to reduce head injuries during sudden stops)
Collapsible steering columns (that prevent the steering wheel from impaling the driver)