The double helix pattern in the ice on these wires baffled me for about a day or so. I had never noticed ice forming on these lines before and couldn't figure out how the ice was forming the way it was. I didn't realize there was much smaller wires between the larger cables. It was only after viewing the images on the computer that I could tell what was up. Should've been obvious, but there it is.
Andrew, sorry for bastardizing whatever these are called. Could be pneumatic tubes for all I know