In fire codes, what is mandatory for exit signs in well-traveled areas?

Exit signs in well-traveled areas are required to be illuminated to ensure visibility during emergencies, such as a fire or power outage. The illumination provides a clear indication of the exit path in low-light conditions, which is crucial for guiding occupants to safety. This requirement stems from fire safety codes that prioritize the evacuation process and prevent confusion or accidents during an urgent situation.

While other options might enhance safety in specific scenarios—like using bright colors or multilingual signs—the fundamental requirement is that exit signs must be consistently illuminated to serve their purpose effectively during emergencies. Sound alarms are not a standard requirement for exit signs and pertain to different safety systems.