What is one purpose of marking air traffic obstructions?

Marking air traffic obstructions primarily serves the critical purpose of warning pilots of potential hazards. This is essential for ensuring the safety of aircraft during takeoff, landing, and while navigating near the airport. Proper marking of obstacles, such as towers, buildings, or trees, allows pilots to assess their surroundings more effectively and make informed decisions to avoid these hazards. Compliance with aviation safety regulations mandates that obstructions are clearly marked, often using specific colors and patterns for visibility during both day and night conditions. This practice significantly contributes to reducing the risk of accidents and enhances overall flight safety. Other options, while they might seem relevant, do not fulfill the primary safety function associated with marking obstructions. For instance, enhancing visual aesthetics or providing advertising space do not directly correlate with the operational safety of aircraft and the pilots navigating them.