What devices signal emergencies when the platform is not visible?

• A. Intercom System
• B. Public Address System
• C. Emergency Signals
• D. Alarm Lights

Answer: (C)

When the platform isn’t visible, you need devices that instantly convey that something is wrong and require a response. Emergency signals are designed for this purpose, providing immediate audible or visual alerts that indicate an emergency even when you can’t see the platform. These signals alert riders and operators to stop, evacuate if needed, and coordinate response.

Intercom and public address systems are for communication—they’re useful for giving instructions, but they don’t automatically signal a hazard to everyone on sight. Alarm lights are part of the signaling, but the broader category of emergency signals covers both the audible alarms and the visual indicators used to alert people quickly.