A mighty fine facility that is, too. Quite apart from that being an especially hazardous, twisty 400m stretch of the A65 which people in general are truly rubbish at driving along, it avoids having to cross the thing twice (when heading west, as per the image above). Given the endless streams of drag-sheds and suburban main battle tanks streaming into the Lake District recently, this is a huge time saver as well as being potentially life-saving.
It cost ... rather a lot. Quite apart from the land, they had to move that dry stone wall away from the road 3-4 metres. Move means deconstruct and build anew. There's 400m of it and I'm told that one metre per day for two people is normal; so eight hundred days labour, plus materials. It certainly took a long time to fully appear.