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If both backup light bulbs are burned out, neither backup light will function. Backup lights are designed to illuminate when the vehicle is in reverse, providing visibility to the driver and indicating to others that the vehicle is reversing. Each bulb relies on being operational to fulfill this purpose. When both bulbs are non-functional, the circuit is effectively broken, leading to a complete loss of backup lighting.

This scenario highlights the importance of regular maintenance and inspection of vehicle lighting systems to ensure safety and compliance with road regulations.