Why must hoistway doors be equipped with interlocks?

Hoistway doors are equipped with interlocks primarily to prevent the elevator from moving when the doors are open. This safety feature is essential to ensure passenger safety. If the elevator were to operate while the doors are open, it could lead to serious injury or even fatal accidents, as passengers might inadvertently step into the elevator shaft.

Interlocks are mechanical or electronic devices that ensure that the elevator cannot be called to a floor or moved until the hoistway doors are securely closed. This mechanism is crucial for maintaining safe operations, as it ensures that the elevator remains stationary, thereby protecting individuals from falling into the shaft.

While other options may provide benefits or functionalities, they do not serve the fundamental purpose of interlocks as a safety mechanism regarding door operations and elevator movement.