What type of light visibility is required for obstruction lights at construction sites?

Obstruction lights at construction sites are required to have sufficient visibility and intensity for prevailing conditions to ensure safety. This means that the lights must be bright enough and distinctly visible under various environmental circumstances, such as fog, rain, or nighttime conditions. The objective is to adequately alert pilots and drivers about potential hazards, particularly in low visibility situations which can be common around construction zones.

This flexibility is essential because the light conditions can change rapidly based on weather, time of day, and surrounding infrastructure. Ensuring that the obstruction lights adjust to meet these variable conditions significantly enhances their effectiveness in preventing accidents and improving overall safety.