Aircraft warning spheres, also known as aviation obstruction balls or marker balls, are commonly used to mark transmission lines to enhance their visibility to low-flying aircraft, especially during adverse weather conditions or at night. These marker balls are typically bright orange in color, which provides high visibility during the day, and they often feature reflective strips to enhance visibility during nighttime operations.

Aircraft warning spheres, also known as aviation obstruction balls or marker balls, are commonly used to mark transmission lines to enhance their visibility to low-flying aircraft, especially during adverse weather conditions or at night. These marker balls are typically bright orange in color, which provides high visibility during the day, and they often feature reflective strips to enhance visibility during nighttime operations.

The orange color is chosen for its high contrast against most backgrounds, making it easier for pilots to spot these markers. The reflective strips further improve visibility by reflecting light from aircraft navigation lights or other light sources.
These marker balls are usually attached to transmission lines at regular intervals using specialized mounting hardware. They serve as visual aids to help pilots navigate safely around the transmission lines, reducing the risk of collisions.
In addition to their use on transmission lines, similar marker balls may also be employed on other types of structures, such as tall buildings, towers, and bridges, to alert pilots to potential hazards.

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