What safety measure prevents elevator doors from closing on passengers?

• A. Emergency stop buttons
• B. Manual door overrides
• C. Door sensors
• D. Weight limit indicators

Answer: (C)

The safety measure that prevents elevator doors from closing on passengers is the door sensors. These sensors are designed to detect any obstruction between the closing doors. When they sense an object, such as a person or an item, the door sensors trigger the doors to either stop from closing or to reopen if they have started to close. This is a vital safety feature that helps to protect passengers from injury and ensures that the elevator operates safely and efficiently.

Other options like emergency stop buttons, while important for halting elevator operation in emergencies, do not specifically address the prevention of door closing. Manual door overrides allow for manual control of the doors, but do not automatically prevent obstruction. Weight limit indicators inform users about the maximum load the elevator can safely carry, but they do not relate to the safe operation of the doors themselves. Hence, door sensors are the specific safety mechanism that directly addresses the issue of preventing doors from closing on passengers.