I've seen lineworkers use orange covers many times, when working near live wires. The place where they put these orange sheets in your photo looks like a disco

I've seen lineworkers use orange covers many times, when working near live wires. The place where they put these orange sheets in your photo looks like a disconnect switch between the wires on either side of the pole. So the wires coming from the left side of your photo are still live, and the disconnect switch itself is still live. Since they would be working near the disconnect switch (to hang the new wire), they put these insulating orange covers for extra protection.