Which transportation product design innovation was first introduced in 1953 and revolutionized passenger comfort by addressing a significant physical limitation of previous designs?

Test your knowledge about groundbreaking product design innovations that transformed the transportation industry. From aerodynamic breakthroughs to user experience enhancements, transportation product design has evolved dramatically over decades. This poll explores a lesser-known but significant design innovation that changed how we experience modern travel. Can you identify the correct historical milestone?

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Recirculating air conditioning systems in commercial aircraft
Articulated bus design allowing for greater passenger capacity while maintaining maneuverability
Pneumatic door closing mechanisms in subway systems
Hydraulic suspension systems in long-distance passenger trains