The news report also says the Old Miltary Road is closed: in the past this has been used as a diversion when the main road is obstructed. There is a very long history of issues on this road http://www.andywightman.com/archives/date/2013/10. Falling rock hazard signs are visible on Mapillary for 1 mile roughly from the N end of Loch Restil across the pass. I think slides have occurred on the other side of the pass, and outside the marked hazard area. There are actually 2 risks here: sporadic rock fall & slope failure (landslide). Only the former is something drivers can potentially respond to.