Interesting stuff Ruffy. Thanks for that. I had a quick google but couldn't find anything on the construction.
The road at the top left of this pic is the one I was on, which leads to Loch Rannoch. Pic is from their website. And yes I did see that construction site, which is the one in my pic like you say.
Are the cables solid? It almost felt like it had an inner core. Maybe just because it was aluminium. We removed some 240mm solid core aluminium SWA cables recently and everyone was amazed at how light they were compared to copper.
That road is also where I took this pic back in April. Presumably to monitor the traffic before construction started?