According to NFPA 407, visibility requirements for shutoff signage mandate it be legible from what distance?

• A. 50 feet
• B. 75 feet
• C. 100 feet
• D. 125 feet

Answer: (B)

The requirement for visibility of shutoff signage as per NFPA 407 is that the signs must be legible from a distance of 75 feet. This standard ensures that personnel can easily see and read the signage in emergency situations, which can be critical for quick decision-making and response actions. Clear visibility from this distance is particularly important in airport environments where the potential for emergencies is heightened, and rapid identification of shutoff locations can mitigate dangers related to fires or hazardous materials. Ensuring that these signs meet visibility requirements helps maintain safety within the airport's operational area and supports efficient emergency response efforts.