Which revolutionary product design feature was first introduced in Volvo vehicles in 1959, becoming a standard safety requirement for all passenger vehicles decades later?

The transportation industry has seen remarkable innovations in product design over the decades, revolutionizing how we move people and goods. From safety features to user experience improvements, thoughtful design has transformed vehicles across all segments. This trivia question explores a significant product design milestone that changed the trajectory of transportation safety and user experience.

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Three-point safety belt
Anti-lock braking system (ABS)
Crumple zones
Electronic stability control