Which safety feature prevents the elevator from being operated if the hoistway door is open?

The door interlock system is a crucial safety feature designed to ensure that an elevator cannot be operated when the hoistway door is open. This system consists of mechanical components that secure the door in a closed position while the elevator is in operation. When the door is not fully closed, the interlock ensures that the elevator's power supply is cut off, preventing the elevator from moving either up or down.

This feature is vital for passenger safety, as it prevents situations where someone might inadvertently enter the elevator shaft while an elevator car is approaching. The interlock system thus acts as a barrier between the door's position and the control system of the elevator, ensuring that all safety protocols are followed before the elevator can be used.