What is the concept of "emergency descent" in elevators?

The concept of "emergency descent" in elevators refers to the protocol for safely bringing an elevator to the nearest floor during an emergency situation, allowing passengers to exit the elevator in a safe manner. This procedure is crucial in situations like power failure or other malfunctions where normal operation cannot be guaranteed.

By moving the elevator to the nearest floor, it ensures that passengers are not left stranded between floors, which can pose additional risks. This immediate action prioritizes safety and embraces an efficient response to emergencies, minimizing panic and allowing for a quicker evacuation route.

The other choices outline important aspects related to elevator safety but do not directly pertain to the specific function of emergency descent. Adjusting cabin lighting, stopping all operations, and activating safety alarms are vital in many emergency situations but do not directly address the need to move passengers to safety quickly and effectively as emergency descent does.