Which innovative product design feature was first introduced in the Tesla Semi truck that significantly improved its aerodynamic efficiency compared to traditional semi trucks?

Test your knowledge about innovative product design in the transportation industry! The transportation sector has seen remarkable design innovations that have revolutionized how we travel and transport goods. From aerodynamic features to sustainable materials, product design plays a crucial role in advancing transportation technology. This trivia question focuses on a groundbreaking design feature that changed modern transportation efficiency. Can you identify the correct innovation?

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Centered driver position with digital side mirrors
Retractable solar panel roof system
Automated trailer coupling mechanism
Hydraulic suspension adjustment system