What color obstruction lights must be used at construction sites adjacent to active aircraft movement areas?

The use of red obstruction lights at construction sites adjacent to active aircraft movement areas is crucial for ensuring safety and visibility. Red lights are well-recognized in aviation for alerting pilots to potential hazards. They have been standardized for this purpose, which allows aircraft pilots to clearly identify obstacles at night or during low visibility conditions. The red color provides a stark contrast against the night sky and is less likely to interfere with aircraft navigation systems.

This standard practice helps in maintaining safe operation within the airspace and ensures that construction activities do not pose unexpected risks to aircraft during takeoff, landing, or taxiing. The specific requirement for red lights in these situations also aligns with aviation regulations and safety protocols designed to minimize hazards in and around airports.