“The Firefly movement is affected by direct wind and indirect wire movement increasing visibility. The Firefly’s glow-in-the-dark feature provides luminescence up to 10 hours at night, fog / low light conditions.”
Birds and helicopters use the road network to navigate. They are usually only above roads to prevent them hitting the wires.
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I could be wrong, but I think they’re to help stop birds flying into the wires.
Looks like a Bird Deflector
https://ecofact.ie/birds-and-power-lines/
Those are used for a fun game. You need a long chain (about 2 meter) with a weight on each end (aboit 0.5 kg would do).
You then try to hit these targets with this chain
Aliens!
You can buy one here:
https://www.birdfighter.com/index.php/firefly-bird-flapper-flight-diverter-2310.html#.YmxrO2nhSNw
It’s actually pretty interesting!
“The Firefly movement is affected by direct wind and indirect wire movement increasing visibility. The Firefly’s glow-in-the-dark feature provides luminescence up to 10 hours at night, fog / low light conditions.”
Birds and helicopters use the road network to navigate. They are usually only above roads to prevent them hitting the wires.
Ah these are the lesser spotted bird deflectors.
to stop planes tripping over them
Target practice. Pretty sure.