What are those spinning red and green reflectors on power lines in Maryland?

The spinning red and green reflectors on power lines in Maryland are commonly known as aerial markers or aviation safety balls. These markers serve an essential purpose in enhancing the visibility of power lines, particularly during low-visibility conditions such as fog, haze, or darkness, to provide safety for both aircraft and power lines' integrity.

The reason behind using red and green colors in these markers is that they adhere to the standard color-coding convention used in aviation. Red lights indicate the left side of an object or structure, while green lights indicate the right side. By employing this color scheme, pilots can easily identify the direction and position of power lines in relation to their aircraft.

These aerial markers are not just limited to power lines but can be found on various other structures that pose potential hazards to air navigation. This includes tall buildings, towers, wind turbines, and communication antennas that exceed a certain height threshold.

The usage of aerial markers contributes to improving air traffic safety and reducing the risk of collisions between aircraft and obstacles. By clearly marking the location of power lines, pilots are alerted to their presence, allowing them to adjust their flight paths accordingly, enhancing overall safety in the airspace.