Power line markers are strategically placed in areas where power lines pose a significant risk. This includes locations near airports, heliports, and flight paths. They are also installed where power lines cross natural features like wide rivers, lakes, or deep canyons, and in open fields where agricultural aircraft operate. The International Civil Aviation Organization (ICAO) and other local regulatory bodies often provide specific guidelines for marker color, size, and spacing to ensure optimal visibility. The highest point of the power line is often the focus of installation to ensure maximum visibility.