[SOLVED] Cone suspended on power line, between 2 poles

[Trikenstein]

Hi,

The photo shows some objects suspended on a power lines near an airfield

Here is the location of those objects on a map:

The 3 pink circles are the oranges balls in the photo. Which seem to be Aerial Marker Balls.

QUESTION: The pink triangle is the cone shown in the photo. What is this cone and what is its usage?

 

[Baluncore]

"The Tottenham/Volk airfield was purchased by a fill operator, under the guise that they need to bring in millions of cubic metres of commercial fill to improve a grass airfield." (Extract from the opening to a petition to stop fill and airfield improvement).
A temporary? grass landing strip has been built on earlier fill, 270 metres west, parallel with the original strip, while the old strip area is being filled.

The orange cone is in direct alignment with the new grass landing strip. The cone is on the upper wire. The balls mark the same power line, but across the end of the original runway. That suggests it is a cable warning marker, and a navigation marker, for the centre of the new (temporary?) runway.

 

[Delta Prime]

An overhead line obstruction warning marker near an airstrip.
https://en.m.wikipedia.org/wiki/Overhead_wire_marker

There are others as well!