What devices are available for the door if DER is activated?

When the DER (Departure Emergency Release) is activated, it is crucial to communicate effectively and monitor the situation at the doors of a train or vehicle. The inclusion of CCTV and PEI (Passenger Emergency Intercom) intercoms serves this purpose exceptionally well.

CCTV provides real-time visual monitoring, allowing safety personnel to observe the conditions and activities around the doors, which is essential for identifying potential threats or emergencies. Meanwhile, the PEI intercom facilitates direct communication between passengers and train operators or emergency services, enabling swift reporting and resolution of any issues. The synergy between these two devices enhances safety measures and helps manage emergencies more efficiently, making them critical components when DER is in effect.

Other options, while relevant to safety and emergency protocols, do not directly provide the combined visual monitoring and communication capabilities necessary when activating DER.