What is the purpose of the round plastic ball like object that you see hanging out of electricity cables?

you see them hanging across road on wires that are coming from pylons.

Answers:
I thought that maybe they were to make it easier to find the wires if they ever fall.
Visibility.
It may be near a hospital or airport and it helps keep helicoptors from running into the wires.
they are so pilots of small aircraft will see the wires and not fly into them

why RED Balls, because Santa flew into wires once and that was all that was left of him!
so that you can see the wires against the sky. an alert for airplanes, helicopters, etc.
I have always believed they were markers to warn low-flying aircraft. Maybe not?
Depends how far apart the cables are. Some birds have such a large wingspan that they could short between two cables so distractors are hung between them to discourage the birds from flying through
I thought it was so the wires couldn't touch together
ITS SO YOU CAN TELL THE MALE WIRES FROM THE FEMALE WIRES. LOL- ACTUALLY THEY ARE TO KEEP THE WIRES FROM TOUCHING IN HIGH WIND.
Is it a light bulb?

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