What is the daytime unusable area for an obstacle that is 25 meters tall?

What is the daytime unusable area for an obstacle that is 25 meters tall?

• A. 150 m
• B. 250 m
• C. 350 m
• D. 500 m

Answer: (B)

The daytime unusable area uses a fixed safety buffer equal to ten times the obstacle height, expressed as a distance. For a 25-meter-tall obstacle, the buffer is 25 × 10 = 250 meters. So 250 meters is the correct unusable distance. The other options are simply different multiples of the height and don’t match this standard 10× rule.

The daytime unusable area uses a fixed safety buffer equal to ten times the obstacle height, expressed as a distance. For a 25-meter-tall obstacle, the buffer is 25 × 10 = 250 meters. So 250 meters is the correct unusable distance. The other options are simply different multiples of the height and don’t match this standard 10× rule.