Overhead wire marker
{{Short description|Markers identifying overhead lines to aircraft}}
Overhead wire markers are safety instruments applied to the overhead power lines marking transmission lines and ropeways along the flight path during the day.[http://www.obstacle-lights.com/day-marking-spheres.html Aerial marker balls for Power lines][https://books.google.com/books?id=kks4flFbttQC&pg=SA2-PA32&lpg=SA2-PA32&dq=markers Marking of Army airfield-heliport operational and maintenance facilities - 7-9 Markers] page 7-6
Image:Einebenenleitung.jpg]] Markers are often installed on overhead lines near airfields, or at river crossings where there is a possibility of seaplanes using the river. Some markers contain conductor marking lights or strobe lights to improve visibility at night or in fog.
File:High voltage transmission line aviation obstruction marker.jpg
