What structures might be marked with Clearance and Obstruction Lights?

Clearance and obstruction lights are essential for enhancing the safety and visibility of structures that may pose hazards to aircraft operations. These lights are typically required on any structure that has the potential to obstruct the flight path near an airport, particularly for low-flying aircraft.

The correct answer encompasses all types of structures mentioned. Hangars, being large buildings where aircraft are stored, can obstruct visibility and therefore need to be marked for safety. Towers are also crucial points that require clear marking since they can significantly impact navigation during takeoff and landing. Similarly, pylons, which can often be part of infrastructural developments or utility lines, also necessitate clear markings due to their potential dangers in the airspace surrounding airports.

By marking all these structures with clearance and obstruction lights, airports facilitate safer operations by ensuring that both pilots and air traffic controllers have a clear view of all potential hazards in the area. This is a crucial safety measure that helps to prevent accidents and enhances the overall safety of air travel.